Wikipedia:WikiProject Missing encyclopedic articles/Global Names Index/X
- Xabea atalaia
- Xabea atalaia atalaia
- Xabea atalaia elderra
- Xabea atalaia elderra Otte & Alexander 1983
- Xabea atalaia elderra Otte, D. & R.D. Alexander 1983
- Xabea atalaia elderra Otte, D. & R.D. Alexander, 1983
- Xabea atalaia Otte & Alexander 1983
- Xabea atalaia Otte & Alexander, 1983
- Xabea atalaia Otte, D. & R.D. Alexander 1983
- Xabea atalaia Otte, D. & R.D. Alexander, 1983
- Xabea atalaia subsp. elderra
- Xabea atalaia subsp. elderra Otte, D. & R.D. Alexander 1983
- Xabea bipunctata
- Xabea bipunctata (De Geer 1773)
- Xabea bipunctata (De Geer, 1773)
- Xabea bipunctatus (De Geer 1773)
- Xabea bipunctatus (De Geer, 1773)
- Xabea decora
- Xabea decora Walker, F. 1869
- Xabea decora Walker, F., 1869
- Xabea elderra
- Xabea elderra Otte & Alexander 1983
- Xabea elderra Otte & Alexander, 1983
- Xabea elderra Otte, D. & R.D. Alexander 1983
- Xabea elderra Otte, D. & R.D. Alexander, 1983
- Xabea furcata
- Xabea furcata Chopard 1927
- Xabea furcata Chopard, 1927
- Xabea inermis
- Xacca Walker 1869
- XAchicodonia
- XAchicodonia eucodonioides
- XAchicodonia eucodonioides (Van Houtte) Wiehler
- XAchicodonia Wiehler
- XAchnella
- XAchnella Barkworth
- XAchnella Barkworth, 1993
- XAchnella caduca
- XAchnella caduca (Beal) Barkworth
- XAchnella caduca (Beal) Barkworth, 1993
- Xacidobacteria
- XAckersteinia
- XAckersteinia dodsonii
- XAckersteinia dodsonii Neudecker
- XAckersteinia Neudecker
- XAegilosecale Cif. & Giacom.
- XAegilotricale
- XAegilotricale Tscherm.-Seys.
- XAegilotrichum
- XAegilotrichum A. Camus
- XAegilotrichum blaringhemii
- XAegilotrichum blaringhemii A. Camus
- XAegilotrichum grenieri
- XAegilotrichum grenieri (K. Richt.) E.G. Camus ex A. Camus
- XAegilotrichum hybridum
- XAegilotrichum hybridum A. Camus
- XAegilotrichum loreti
- XAegilotrichum loreti (K. Richt.) Camus
- XAegilotrichum rodeti
- XAegilotrichum rodeti (Trab.) A. Camus
- XAegilotrichum speltiforme
- XAegilotrichum speltiforme (Jord.) E.G. Camus ex A. Camus
- XAegilotrichum triticoides
- XAegilotrichum triticoides (Req. ex Bertol.) E.G. Camus ex A. Camus
- XAegilotrichum triuncialis-durum
- XAegilotrichum triuncialis-durum Oehler
- XAegilotricum
- XAegilotricum Tscherm.-Seys.
- XAegilotriticum
- XAegilotriticum erebunii
- XAegilotriticum erebunii (Gandilyan) Slageren
- XAegilotriticum grenieri
- XAegilotriticum grenieri (K. Richt.) P. Fourn.
- XAegilotriticum langeanum
- XAgrocalamagrostis Asch. & Graebn.
- XAgrocalamagrostis stebleri
- XAgrocalamagrostis stebleri Asch. & Graebn.
- XAgroelymus
- XAgroelymus A. Camus
- XAgroelymus A. Camus, 1927
- XAgroelymus adamsii
- XAgroelymus adamsii J. Rousseau
- XAgroelymus adamsii J. Rousseau, 1952
- XAgroelymus bergrothii
- XAgroelymus bergrothii (H. Lindb.) J. Rousseau
- XAgroelymus bowdenii
- XAgroelymus bowdenii B. Boivin
- XAgroelymus bowdenii B. Boivin, 1967
- XAgroelymus cayouetteorum
- XAgroelymus cayouetteorum B. Boivin
- XAgroelymus cayouetteorum B. Boivin, 1967
- XAgroelymus colvillensis
- XAgroelymus colvillensis Lepage
- XAgroelymus colvillensis Lepage, 1952
- XAgroelymus dorei
- XAgroelymus dorei Bowden
- XAgroelymus dorei Bowden, 1967
- XAgroelymus hirtiflorus
- XAgroelymus hirtiflorus (Hitchc.) Bowden
- XAgroelymus hirtiflorus (Hitchc.) Bowden, 1959
- XAgroelymus hodgsonii
- XAgroelymus hodgsonii Lepage
- XAgroelymus hodgsonii Lepage, 1952
- Xaiasme bicolor
- Xaiasme bicolor Raf.
- Xaiasme Raf.
- Xainonotum
- Xainonotum Aldrich 1905
- Xainzalites
- Xainzalites Sheng 1983
- Xainzalites xainzaensis
- Xainzalites xainzaensis Sheng 1983
- Xainzanella
- Xainzanella MU 1984
- Xainzanella sinensis
- Xainzanella sinensis X. N. Mu
- Xainzanella sinensis X.N. Mu
- Xainzanella X. N. Mu, 1984
- Xainzanella X.N. Mu 1984
- Xainzanoceras
- Xainzanoceras Chen 1987
- Xainzanoceras xainzaense
- Xainzanoceras xainzaense Chen 1987
- Xainzapora
- Xainzapora Lin 1990
- Xainzapora yongzhuensis
- Xainzapora yongzhuensis Lin 1990
- Xaittusia
- Xaiva
- Xaiva bachmayeri
- Xaiva bachmayeri Muller 1984
- Xaiva biguttata
- XAlamaealoe P.V. Heath
- XAlangreatwoodara
- XAlangreatwoodara hort.
- Xalitla
- Xalitla azteca
- Xalitla azteca Chemsak & Noguera 1993
- Xalitla azteca Chemsak & Noguera, 1993
- Xalitla azteca Chemsak, Linsley & Noguera 1992
- Xalitla azteca Chemsak, Linsley & Noguera, 1992
- Xalitla azteca Lane 1959
- Xalitla azteca LANE Frederico, 1959
- Xalitla azteca Lane, 1959
- Xalitla azteca Martins & Chemsak 1966
- Xalitla azteca Martins & Chemsak, 1966
- Xalitla azteca Martins 1970
- Xalitla azteca Martins, 1970
- Xalitla azteca Monné & Giesbert, 1994
- Xalitla azteca Monné 1993
- Xalitla azteca Monné 2001
- Xalitla azteca Monné, 1993
- Xalitla azteca Monné, 2001
- Xalitla azteca Monn� & Giesbert 1994
- Xalitla azteca Monn� 1993
- Xalitla azteca Monn� 2001
- Xalitla azteca Noguera & Chemsak 1996
- Xalitla azteca Noguera & Chemsak, 1996
- Xalitla genuina
- Xalitla genuina Chemsak, Linsley & Noguera 1992
- Xalitla genuina Chemsak, Linsley & Noguera, 1992
- xamachana Bigelow 1892
- Xamacrista
- Xamacrista Raf.
- Xamacrista Rafinesque 1838
- Xamacrista Rafinesque, 1838
- Xamacrista triflora
- Xamacrista triflora Raf.
- xamaneki Fiers 1995
- Xamarcrinum
- Xamarygia
- xamaycaense Pulitzer-Finali 1986
- xamaycaensis (Pulitzer-Finali 1986)
- xamaysana Millar & Goodbody 1974
- Xamenophlebia
- Xamenophlebia ornata
- Xamenophlebia ornata Pritykina 1981
- Xamenophlebia Pritykina 1981
- Xamenophlebiidae
- Xamenophlebiidae Pritykina 1981
- Xamenophlebioidea
- Xamenophlebioidea Pritykina 1981
- Xamerpillus
- Xamerpillus gahani
- Xamerpillus gahani Sicard 1912
- Xamerpillus Sicard 1912
- Xamerpus
- Xamerpus (?) cioides Champion 1924
- Xamerpus alluaudi
- Xamerpus bequaerti
- Xana "DÃaz CosÃn, Briones & Trigo" 1989
- Xana bergeroni
- Xana bergeroni (Oehlert 1885)
- Xana bubo
- Xana bubo Garcia-Alcalde 1972
- Xana CosÃn Briones & Trigo 1989
- xana de Laubenfels 1954
- Xana Diaz Cosin Briones & Trigo 1989
- Xana Diaz Cosin, Briones & Trigo 1989
- Xana Garcia-Alcalde 1972
- Xana Kurdj.
- Xana Kurdjumov 1916
- Xana Kurdjumov 1917
- Xana kurdjumovi
- Xana kurdjumovi Nikol'skaya, 1950
- Xana kurdjumovi Nikol'skaya 1950
- Xana kurdjumovi Nikol'skaya, 1950
- Xana nigra
- Xana nigra Kurdjumov 1917
- Xana nigra Kurdjumov, 1917
- Xana omodeoi
- Xana omodeoi Diaz Cosin, Briones & Trigo 1989
- Xana tricostata
- Xana tricostata Garcia-Alcalde 1992
- Xanadoses
- Xanadoses Hoare & Dugdale 2003
- Xanadoses nielseni
- Xanadoses nielseni Hoare & Dugdale 2003
- Xanadoses nielseni Hoare & Dugdale, 2003 E
- XAporophyllum hort. ex D.R. Hunt
- Xapus
- Xapus Wallace 1880
- Xarada Carpintero 1980
- Xarapoa
- Xarapoa Froelich 1955
- Xarapoa hystrix
- Xarapoa hystrix Froelich 1955
- Xarapoa una
- Xarapoa una Froelich 1955
- Xarcophaga
- Xarcophaga Dodge 1968
- Xarcophaga peruviana
- Xarcophaga peruviana Lopes 1975
- Xarcophaga peruviana Lopes, 1975
- Xarcophaga titubata peruviana
- Xarcophaga titubata peruviana Lopes 1975
- Xarcophaga titubata spp. peruviana Lopes, 1975
- Xarcophaga xon
- Xarcophaga xon Dodge 1968
- Xarcophaga xon Dodge, 1968
- XArctodupontia
- XArctodupontia scleroclada
- XArctodupontia scleroclada (Rupr.) Tzvelev
- XArctodupontia scleroclada (Rupr.) Tzvelev, 1973
- XArctodupontia Tzvelev
- XArctodupontia Tzvelev, 1973
- Xarifa
- Xarifa apertipes
- Xarifa comptula
- Xarifa curtata
- Xarifa Fall 1905
- Xasca Walker 1869
- XAsplenosorus
- XAsplenosorus boydstonae
- XAsplenosorus boydstonae K.S. Walter
- XAsplenosorus ebenoides
- XAsplenosorus ebenoides (R.R. Scott (pro. sp.)) Wherry
- XAsplenosorus inexpectatus
- XAsplenosorus inexpectatus E.L. Braun ex Friesen
- XAsplenosorus pinnatifidus
- XAsplenosorus pinnatifidus (Muhl.) Mickel
- XAsplenosorus shawneensis
- XAsplenosorus shawneensis R.C. Moran
- XAsplenosorus Wherry
- Xastila
- Xastila Bouchet & Houart 1994
- Xastilia
- Xastilia Bouchet & Houart 1994
- Xastilia kosugei
- Xastilia kosugei Bouchet & Houart 1994
- Xastilla
- Xastilla Bouchet & Houart 1994
- Xastilla kosugei Bouchet & Houart, 1994
- Xastrum
- Xastrum Neviani 1900
- Xatardia Meisn.
- Xatardia Meisn. & Zeyh.
- Xatardia Meisner & Zeyher ex Meisn.
- Xatardia Meisner & Zeyher in Meisner 1838
- Xatardia Meisner et Zeyher in Meisner, 1838
- Xatardia scabra
- Xatardia scabra ( Lapeyr.) Meissner
- Xatardia scabra (Lap.) Meisn.
- Xatardia scabra (Lapeyr.) Meisn.
- Xatardia scabra (Lapeyr.) Meissner
- Xatardia scabra Meisn.
- Xatardia scraba Meissn.
- Xatarta
- Xatarta St.-Lag.
- Xatatia
- Xatatia Bubani
- Xatatia pyrenaica
- Xatatia pyrenaica Bubani
- Xathea
- Xathea Baly 1865
- Xathorhoe spadicearia
- Xatis
- Xatis Fairmaire 1901
- Xatis nigripes
- Xatis nigripes Fairmaire 1901
- XAttabignya minarum
- XAttabignya minarum Balick, A.B. Anderson & Med.-Costa
- Xaurus bennigseni
- Xaurus bennigseni Lameere 1912
- Xaurus bennigseni Lameere 1913
- Xaurus bennigseni Lameere, 1912
- Xaurus depsarius
- Xaurus depsarius (Pasc. )
- Xaurus depsarius Pascoe 1867
- Xaurus depsarius PASCOE Francis Polkinghorne, 1867
- Xaurus depsarius Pascoe, 1867
- Xaurus papuus
- Xaurus papuus Komiya 2000
- Xaurus papuus Komiya, 2000
- Xaurus papuus Lansberge 1884
- Xaurus papuus Lansberge, 1884
- Xaurus Pascoe 1867
- Xautholininae
- Xavantinisca
- Xavantinisca Carvalho & Costa 1992
- Xavantinisca matogrossensis
- Xavantinisca matogrossensis Carvalho & Costa 1992
- Xaveria
- Xaveria Endl.
- Xaveria Endl.Gen.
- Xaveria Endlicher 1850
- Xaveria Endlicher, 1850
- Xaveria macrophylla
- Xaveria macrophylla Endl. ex Walp.
- Xaveropora
- Xaveropora Malecki 1964
- Xaveropora Malecki, 1964
- Xaveropora ojcowensis
- Xaveropora ojcowensis Malecki 1964
- Xaveropora ojcowensis Malecki, 1964
- Xavier
- Xavier manca
- Xavier manca (Gerstaecker, 1885)
- Xaviera
- Xaviera Lambkin 1986
- Xaviera manca
- Xaviera manca (Gerstaecker 1885)
- Xaviera manca (Gerstaecker)
- [[Xaviera manca (Gerstaecker, [1885])]]
- xavieri (Braga 1956)
- xavieri Arcangeli 1958
- xavieri Braga 1956
- Xaxexis Pagliano & Scaramozzino 1989
- Xaymaca fulvopulvis
- Xaymaca fulvopulvis MacPhee & Flemming 2003
- Xaymaca MacPhee & Flemming 2003
- xaymaca V.J.Chapman 1963
- xaymacana Conant 1897
- Xaymacia
- Xaymacia granulata
- Xaymacia granulata Loomis 1948
- Xaymacia granulata Loomis, 1948
- Xaymacia Loomis 1948
- Xaymacia Loomis, 1948
- XBaptirettia hort.
- XBarlorchis
- XBarlorchis Kalop. & Constantinidis
- XBarlorchis salaminensis
- XBarlorchis salaminensis Kalop. & Constantinidis
- XBiltonara hort.
- XBleckara P.V. Heath
- XBolleanthus hort.
- XBorzipostoa
- XBorzipostoa G.D. Rowley
- XBorzipostoa mirabilis
- XBorzipostoa mirabilis (Rauh & Backeb.) G.D. Rowley
- XBrachystemon nolae-carriae
- XBrachystemon nolae-carriae P.V. Heath
- XBrachystemon P.V. Heath
- XBrassomicra
- XBrassomicra hort.
- XBrigandra
- XBrigandra callientha
- XBrigandra callientha (O. Schwarz) Jungn.
- XBrigandra O. Schwarz ex Jungn.
- XBromofestuca
- XBromofestuca cojocnensis
- XBromofestuca cojocnensis Prodán
- XBromofestuca Prodán
- XButiarecastrum nabonnandii Robertson-Proschowsky
- XButyagrus nabonnandii
- XButyagrus nabonnandii (Robertson-Proschowsky) Vorster
- XCalammophila
- XCalammophila baltica
- XCalammophila baltica (Flüggé ex Schrad.) Brand
- XCalammophila Brand
- XCalammophila Brand, 1907
- XCalammophila don-hendersonii
- XCalammophila don-hendersonii Reznicek & Judz.
- XCalammophila don-hendersonii Reznicek & Judz., 1996
- XCalamophila
- XCalamophila baltica
- XCalamophila baltica (Fluegge ex Schrader) O. Schwarz
- XCalamophila baltica (Flüggé ex Schrad.) O. Schwarz
- XCalamophila O. Schwarz
- XCalamophila O. Schwarz, 1949
- XCastanocasta
- XCastanocasta Cif. & Giacom.
- XCastanocastanea
- XCastanocastanea P.V. Heath
- XCatamodes
- XCatamodes R.H. Torr.
- XCatanoches
- XCatanoches hort.
- XCelsioverbascum gabrielianae
- XCelsioverbascum gabrielianae Huber-Morath
- XCelsioverbascum Rech. f.
- XCerasolouiseania
- XCerasolouiseania cziczanica
- XCerasolouiseania cziczanica E. Lomakin & Juschev.
- XCerasolouiseania E. Lomakin & Juschev
- XCeratograecum
- XCeratograecum hort.
- Xchitalpa
- XChondrobollea
- XChondrobollea Rolfe
- XChondropetalon
- XChondropetalon hort.
- XClinomicromeria Govaerts
- XClinomicromeria hostii
- XClinomicromeria hostii (Caruel) Govaerts
- XClinomicromeria hostii (Caruel) Govaerts nothosubsp. narentana (K. Malý ex Dörfl.) Govaerts
- XClinomicromeria hostii narentana
- Xcnoclystia
- Xcnoclystia Warren 1906
- Xcnotaenia
- Xcnotaenia resolanae
- Xcnotaenia resolanae Turner 1946
- Xcnotaenia Turner 1946
- XCoeloglossorchis Guetrot
- XCupressocyparis notabilis A.F. Mitchell
- XCupressocyparis ovensii
- XCupressocyparis ovensii A.F. Mitchell
- XCuprocyparis
- XCuprocyparis Farjon
- XCuprocyparis leylandii
- XCuprocyparis leylandii (A.B. Jacks. & Dallim.) Farjon
- XCuprocyparis notabilis
- XCuprocyparis notabilis (A.F. Mitchell) Farjon
- XCuprocyparis ovensii
- XCuprocyparis ovensii (A.F. Mitchell) Farjon
- XCynochloris Clifford & Everist
- XCynochloris macivorii
- XCynochloris macivorii Clifford & Everist
- XCynochloris reynoldensis
- XCynochloris reynoldensis B.K. Simon
- XDactyloglossum
- XDactyloglossum P.F. Hunt & Summerh.
- XDactyloglossum turcestanicum
- XDactyloglossum turcestanicum (G. Keller & Soó) Soó
- XDanthosieglingia
- XDanthosieglingia breviaristata
- XDanthosieglingia breviaristata (Beck) Domin
- XDanthosieglingia breviaristata (Beck) Domin fo. chasmogama (Vierh.) A. Nyár.
- XDanthosieglingia breviaristata (Beck) Domin fo. cleistogama (Vierh.) A. Nayar
- XDanthosieglingia breviaristata chasmogama
- XDanthosieglingia breviaristata cleistogama
- XDanthosieglingia Domin
- XDupoa J. Cay. & Darbysh.
- XDupoa J. Cay. & Darbysh., 1993
- XDupoa labradorica
- XDupoa labradorica (Steud.) J. Cay. & Darbysh.
- XDupoa labradorica (Steud.) J. Cay. & Darbysh., 1993
- XDupontopoa
- XDupontopoa dezhnevii
- XDupontopoa dezhnevii Prob.
- XDupontopoa dezhnevii Prob., 1984
- XDupontopoa Prob.
- XDupontopoa Prob., 1984
- Xeatolebris gracilia Brady 1890
- Xeatolebris wrightii
- Xeatolebris wrightii Jones 1890
- Xeda amplipennis
- Xeda amplipennis Pascoe 1873
- Xeda amplipennis Pascoe, 1873
- Xeda bilineata
- Xeda bilineata Pascoe 1873
- Xeda bilineata Pascoe, 1873
- Xeda fasciata
- Xeda fasciata Lea 1915
- Xeda fasciata Lea, 1915
- Xeda magistra
- Xeda magistra Blackburn 1894
- Xeda magistra Blackburn, 1894
- Xeda notabilis
- Xeda notabilis Blackburn 1894
- Xeda notabilis Blackburn, 1894
- Xeda Pasc.
- Xeda Pascoe 1873
- Xedeota
- Xedeota Kramer 1966
- Xederra
- Xederra Ander 1938
- Xederra barbarae
- Xederra barbarae Rentz 1985
- Xederra barbarae Rentz, 1985
- Xederra barbarae Rentz, D.C.F. 1985
- Xederra barbarae Rentz, D.C.F., 1985
- Xederra charactus
- Xederra charactus Rentz 1985
- Xederra charactus Rentz, 1985
- Xeilyathum altissimum
- Xeilyathum altissimum (Jacq.) Raf.
- Xeilyathum altissimum Raf.
- Xeilyathum Raf.
- Xeilyathum Rafinesque 1837
- Xeilyathum Rafinesque, 1837
- Xeinodactylites
- Xeinodactylites Buckman 1926
- Xeinophylloceras
- Xeinophylloceras Buckman 1921
- Xeinophylloceras xeinus
- Xeinophylloceras xeinus Buckman 1921
- Xeinostoma
- Xeinostoma antiqua
- Xeinostoma eucheir
- Xeinostoma eucheir Stebbing 1920
- Xeinostoma eucheir Stebbing, 1923
- Xeinostoma inopinatum
- Xeinostoma inopinatum Tavares 1994
- Xeinostoma inoptinatum Tavares, 1994
- Xeinostoma richeri
- Xeinostoma richeri Tavares 1993
- Xeinostoma richeri Tavares, 1993
- Xeinostoma sakaii
- Xeinostoma sakaii Tavaers, 1993
- Xeinostoma sakaii Tavares 1993
- Xeinostoma Stebbing 1920
- Xeinostoma? antiqua
- Xeinostoma? antiqua Schweitzer 2001
- Xela alex
- Xela alex Thompson
- Xela alex Thompson 1999
- Xela alex Thompson, 1999
- Xela drena
- Xela drena Jell 1990
- Xela Jell 1990
- Xela Jell in Bengtson Conway Morris, Cooper, Jell & Runnegar 1990
- Xela JELL in BENGTSON et al. 1990
- Xela margarita
- Xela margarita Thompson
- Xela margarita Thompson 1999
- Xela margarita Thompson, 1999
- Xela mathurjoshi
- Xela mathurjoshi Jell & Hughes 1997
- Xela Thompson & Vockeroth 1999
- Xela Thompson & Vockeroth in Thompson 1999
- Xele
- Xele albiditarsus
- Xelix
- Xeloma
- Xeloma (Paraxeloma)
- Xeloma (Paraxeloma) Holm 1988
- Xeloma (Xeloma)
- Xeloma (Xeloma) Kraatz 1881
- Xeloma (Xeloma) leprosa (Burmeister 1842)
- Xeloma (Xeloma) tomentosa angolensis (Valck Lucassen 1936)
- Xeloma (Xeloma) tomentosa tomentosa (Gory & Percheron 1833)
- Xeloma (Xeloma) vuilleti (Bourgoin 1914)
- Xema brunneicephala
- Xema furcata
- Xema furcatum
- Xema furcatus
- Xema jamesonii
- Xema Leach 1819
- Xema Leach, 1819
- Xema phæocephala
- Xema s. tschukts chorum
- Xema s. woznesenskii
- Xema sabina
- Xema sabinei
- Xema sabini
- Xema sabini (Sabine )
- Xema sabini (Sabine 1819)
- Xema sabini (Sabine)
- Xema sabini (Sabine) 1819
- Xema sabini (Sabine, 1819)
- Xema sabini palaearctica
- Xema sabini sabina
- Xema sabini Sabine 1819
- Xema sabini sabini
- Xema sabini ssp
- Xema sabini ssp?
- Xema sabini woznesenskii
- Xema sabinii
- Xematopis grandisquama
- Xematopis grandisquama Weber & Beauiort 1929
- Xemichthys scolopaceus
- Xena (Neohaplegis) straminea
- xena de Laubenfels 1954
- xena De Weerdt 1986
- Xena Martins-Neto 1999
- Xena nana
- Xena nana Martins-Neto 1999
- Xena Narchuk 1964
- Xena Nartshuk
- Xena Nartshuk 1964
- Xena Nartshuk, 1964
- Xena sabini
- Xena straminea
- Xena straminea Narchuk 1964
- Xena straminea Nartshuk
- Xena straminea Nartshuk 1964
- Xena straminea Nartshuk, 1964
- Xenaastrapotherium
- Xenaastrapotherium chaparralensis
- Xenacalamus bicolor lineatus
- Xenacalles
- Xenacalles Broun
- Xenacalles Broun 1911
- Xenacalles nigricans
- Xenacalles nigricans Broun 1917
- Xenacalles nigricans Broun, 1917
- Xenacalles nodifer
- Xenacalles nodifer Broun 1914
- Xenacalles nodifer Broun, 1914
- Xenacalles simplex
- Xeocephaes Giebel 1877
- Xeocephalus
- Xeocephalus Gray 1869
- Xeocephus
- Xeocephus Bonaparte 1854
- Xeodolon
- Xeodolon R. A. Salisbury, 1866
- Xeodolon R.A. Salisbury 1866
- Xeodolon revolutum
- Xeodolon revolutum (L.f. ) Salisb.
- Xeodolon revolutum (L.f.) Salisb.
- Xeodolon revolutum Salisb.
- Xeodolon Salisb.
- Xeonmartiniidae
- Xeonmartiniidae Havlicek 1971
- Xeonphora
- Xeonphora exuta
- Xeonphora pallidula
- Xeophema chrysoatoma
- Xeoprosopa
- Xeoprosopa Townsend 1919
- Xeoprosopa urnhnasi
- Xeoprosopa urnhnasi Townsend 1919
- Xeoprosopa uruhuasi
- Xeoprosopa uruhuasi Townsend 1919
- Xeoprosopa uruhuasi Townsend, 1919
- Xeothunnus albacora
- Xephocercus valenciennii
- Xepicula
- Xepicula leucotricha
- Xepicula leucotricha (Peck) Nag Raj
- Xepicula leucotricha (Peck) Nag Raj 1993
- Xepicula leucotricha, (Peck) Nag Raj
- Xepicula leucotrichoides
- Xepicula leucotrichoides Nag Raj
- Xepicula leucotrichoides Nag Raj 1993
- Xepicula Nag Raj
- Xepicula Nag Raj 1993
- Xepicula T. R. Nag Raj, 1993
- Xepiculopsis
- Xepiculopsis graminea
- Xepiculopsis graminea (Lib.) Nag Raj
- Xepiculopsis graminea (Lib.) Nag Raj 1993
- Xepiculopsis graminea, (Libert) Nag Raj
- Xepiculopsis Nag Raj
- Xepiculopsis Nag Raj 1993
- Xepiculopsis perpulchra
- Xepiculopsis perpulchra Nag Raj
- Xepiculopsis perpulchra Nag Raj 1993
- Xepiculopsis T. R. Nag Raj, 1993
- Xeplenois
- Xeplenois anemos
- Xeplenois anemos Bamber 2005
- Xeplenois anemos Bamber, 2005
- Xeplenois Bamber 2005
- Xeptaea
- Xera apolinari
- Xera apolinari Günther 1932
- Xera apolinari Günther, 1932
- Xera apolinari G�nther 1932
- Xera debilis
- Xera debilis Redtenbacher 1906
- Xera debilis Redtenbacher, 1906
- Xera Redtenbacher 1906
- Xera Redtenbcher
- Xeracauta
- Xeracauta Monterosato 1892
- Xerachistus
- Xerachistus acutus
- Xerachistus acutus Bezzi 1924
- Xerachistus acutus Bezzi, 1924
- Xerachistus atronotatus
- Xerachistus atronotatus (Hesse )
- Xerachistus atronotatus (Hesse)
- Xerachistus atronotatus Hesse 1938
- Xerachistus atronotatus Hesse, 1938
- Xerachistus Greathead 1995
- Xerachistus mundus
- Xerachistus mundus (Loew )
- Xerachistus mundus (Loew)
- Xerachistus mundus Loew 1863
- Xerachistus mundus Loew, 1863
- Xerachistus rhomboidalis
- Xerachistus rhomboidalis (Hesse )
- Xerachistus rhomboidalis (Hesse)
- Xesamatia flavipes
- Xesamatia flavipes Timberlake 1920
- Xesamatia Timberlake 1920
- Xesfobium
- Xesfobium Zaitsev, 1956
- Xesloleberis dactylotypa
- Xesloleberis dactylotypa Bold 1946
- Xesloleberis dumblei
- Xesloleberis dumblei Stephenson 1946
- Xesloleptura pictipennis
- Xesloleptura pictipennis Casey 1924
- Xesmatia
- Xesmatia flavipes
- Xesmatia flavipes Timberlake 1920
- Xesmatia flavipes Timberlake 1920 sec. Beardsley 1977
- Xesmatia flavipes Timberlake 1920 sec. Huang & Noyes 1994
- Xesmatia flavipes Timberlake 1920 sec. Nishida 2001
- Xesmatia flavipes Timberlake 1920 sec. Timberlake 1922
- Xesmatia flavipes Timberlake 1920 sec. Timberlake 1924
- Xesmatia flavipes Timberlake, 1920
- Xesmatia Timberlake 1920
- Xesmodon
- Xesmodon Berg 1899
- Xesmodon langi
- Xesocyclus
- Xesocyclus Baker 1940
- Xespostingia
- Xesta
- Xesta (Albers )
- Xeta olovica
- Xeta olovica Pritykina 2006
- Xeta Pritykina 2006
- Xetatmetus
- Xetatmetus camerunus
- Xetatmetus camerunus Hustache 1932
- Xetatmetus Hustache 1932
- Xethomyza
- Xethomyza Hesse, 1938
- Xetola
- Xetola Raf.
- Xetola Rafinesque 1838
- Xetola Rafinesque, 1838
- Xetola transylvanica
- Xetola transylvanica Raf.
- Xetola trenta
- Xetola trenta Raf.
- Xetoligus
- Xetoligus brevifolius
- Xetoligus brevifolius Raf.
- Xetoligus Raf.
- Xetoligus Rafinesque 1838
- Xetoligus Rafinesque, 1838
- Xetoligus salicifolius
- Xetoligus salicifolius (Cav.) Raf.
- Xetoligus salicifolius Raf.
- Xetospongia
- Xetwomorphus draconianus
- XEuchlaezea Bor
- xEuchlaezea mertonensis
- xEuchlaezea mertonensis Jan. Ammal
- Xeugophora maculata
- Xeugophora maculata Chujo 1941
- Xeuxes
- Xeuxes brevicollis
- Xeuxes brevicollis Champion 1889
- Xeuxes Champion 1889
- Xeuxes diversicornis
- Xeuxes diversicornis Pic 1930
- Xeuxidia
- Xeuxidia Young 1903
- Xevioso amica
- Xevioso amica Griswold 1990
- Xevioso amica Griswold, 1990
- Xevioso auluata
- Xevioso auluata Griswold 1990
- Xevioso aululata
- Xevioso aululata Griswold 1990
- Xevioso aululata Griswold, 1990
- Xevioso colobata
- Xevioso colobata Griswold 1990
- Xevioso colobata Griswold, 1990
- Xevioso jocquei
- Xevioso jocquei Griswold 1990
- Xevioso jocquei Griswold, 1990
- Xevioso kulufa
- Xevioso kulufa Griswold 1990
- Xevioso kulufa Griswold, 1990
- Xevioso Lehtinen 1967
- Xevioso lichmadina
- Xevioso lichmadina Griswold 1990
- Xevioso lichmadina Griswold, 1990
- Xevioso orthomeles
- Xevioso orthomeles Griswold 1990
- Xevioso orthomeles Griswold, 1990
- Xevioso tuberculata
- Xevioso tuberculata (Lawrence 1939)
- Xevioso tuberculata (Lawrence, 1939)
- Xevioso tuberculata Lehtinen, 1967
- Xevioso zuluana
- Xexanchorinus Grouv.
- Xexanchorinus Grouvelle 1898
- Xexanchorinus latus
- Xexanchorinus latus Grouvelle
- Xexanchorus
- Xexanchorus Grouvelle 1896
- Xextina
- Xextocephalus
- XFestuca braunii K. Richt.
- XFestuca brinkmannii
- XFestuca brinkmannii A. Braun
- XFestuca holmbergii
- XFestuca holmbergii Dörfl.
- XFestulolium
- XFestulolium Asch. & Graebn.
- XFestulolium Asch. & Graebn., 1902
- XFestulolium braunii
- XFestulolium braunii (K. Richt.) A. Camus
- XFestulolium brinkmannii
- XFestulolium brinkmannii (A. Braun) Asch. & Graebn.
- XFestulolium holmbergii
- XFestulolium holmbergii (Dörfl.) P. Fourn.
- XFestulolium loliaceum
- XFestulolium loliaceum (Huds.) C.E. Hubb.
- XFestulolium loliaceum (Huds.) C.E. Hubb., 1939
- XFestulolium loliaceum (Huds.) P. Fourn.
- XFestulolium loliaceum (Huds.) P. Fourn., 1935
- XFestulolium nilssonii
- XFestulolium nilssonii Cugnac & A. Camus
- XFestulpia
- XFestulpia hubbardii
- XFestulpia hubbardii Stace & R. Cotton
- XFestulpia melderisii
- XFestulpia melderisii Stace & R. Cotton
- XFestulpia Stace & Cotton
- Xglocopa
- XGloxinera
- XGloxinera rosea
- XGloxinera rosea H.E. Moore & R.G. Wilson
- XGloxinera tapeinotes
- XGloxinera tapeinotes hort.
- XGloxinera Weathers
- XGonostelma nolea-carriae
- XGonostelma nolea-carriae (P.V. Heath) P.V. Heath
- XGonostelma P.V. Heath
- XHaagespostoa albisetata
- XHaagespostoa albisetata (Akers) G.D. Rowley
- XHaagespostoa climaxantha
- XHaagespostoa climaxantha (Werderm.) G.D. Rowley
- XHaagespostoa G.D. Rowley
- XHaberiorchis
- XHaberiorchis Rolfe
- XHainardiopholis
- XHainardiopholis Castrov.
- XHainardiopholis pauneroi
- XHainardiopholis pauneroi Castrov.
- XHaynaldoticum
- XHaynaldoticum Cif. & Giacom.
- XHaynaldoticum turgidovillosum
- XHaynaldoticum turgidovillosum (Tscherm.-Woess) Cif. & Giacom.
- XHemionanthes gryphus
- XHemionanthes gryphus (Mickel) Mickel
- XHemionanthes Mickel
- Xherius
- Xherius Raffray 1903
- Xherius Raffray 1904
- Xheroctys
- Xheroctys jeannelliella
- Xheroctys jeannelliella Viette 1954
- Xheroctys Viette 1954
- XHesperotsuga
- XHesperotsuga C.N. Page
- XHesperotsuga jeffreyi
- XHesperotsuga jeffreyi (Henry) C.N. Page
- XHibanobambusa Maruy. & Okamura
- Xhoaphryx lemeei
- Xhoaphryx lemeei Viette 1953
- Xhoaphryx lemeei Viette, 1953
- Xhoaphryx Viette 1953
- Xhoodiopsis
- XHordale
- XHordale Cif. & Giacom.
- XHordelymus
- XHordelymus Bacht. & Darevsk.
- XHordelymus Bacht. & Darevsk., 1950
- XHordeopyrum
- XHordeopyrum Simonet
- XHorderoegneria
- XHorderoegneria chatangensis
- XHorderoegneria chatangensis (Roshev.) Tzvelev
- XHorderoegneria chatangensis (Roshev.) Tzvelev, 1964
- XHorderoegneria Tzvelev
- XHorderoegneria Tzvelev, 1964
- Xhosacetus
- Xhosacetus Bianucci, Lambert & Post 2007
- Xhosacetus hendeysi
- Xhosacetus hendeysi Bianucci, Lambert & Post 2007
- Xhosores
- Xhosores Bell & Bell 1978
- Xhosores R.T. & J.R.BELL 1978
- XHuerianthus Barad
- XHuernelia
- XHuernelia Barad
- XHulthemosa
- XHulthemosa guzarica
- XHulthemosa guzarica Juz.
- XHulthemosa Juz.
- XHulthemosa kopetdaghensis
- XHulthemosa kopetdaghensis (Meff.) Juz.
- XHulthemosa turcomanica
- XHulthemosa turcomanica Blin.
- Xiadongoceras clinoseptatum
- Xiadongoceras clinoseptatum Xu & Lai 1983
- Xiadongoceras ellinoseptatum
- Xiadongoceras ellinoseptatum Lai & Xu 1983
- Xiadongoceras Lai & Xu 1983
- Xiadongoceras Lai & Xu in Zeng Ni, Xu, Zhou, Wang, Li, Lai & Xiang 1983
- Xiadongoceras typicum
- Xiadongoceras typicum Xu & Lai 1983
- Xiadongoceras Xu & Lai 1983
- Xiadongoceras Xu & Lai in Ni Wang, Xu, Zhou, Zeng, Li, Xiang & Lai 1983
- Xiadongoconus
- Xiadongoconus luminosus
- Xiadongoconus luminosus Yu Wen 1979
- Xiadongoconus Yu Wen 1979
- Xiadongtubulus
- xiae Li, Su & Yu 2004
- Xiaitermes
- Xiaitermes Gao & He 1993
- Xiaitermes Gao & He in He & Gao 1993
- Xiaitermes tiantaiensis
- Xiaitermes tiantaiensis Gao & He 1993
- Xiaitermes yinxianensis
- Xiaitermes yinxianensis Gao & He 1993
- Xiaitettix
- Xiaitettix guangxiensis
- Xiaitettix guangxiensis Zheng & Liang 1993
- Xiaitettix guangxiensis Zheng & Liang, 1993
- Xiaitettix guangxiensis Zheng, Z. & Liang 1993
- Xiaitettix guangxiensis Zheng, Z. & Liang, 1993
- Xibaro ashmolei
- Xibaro ashmolei Righi 1981
- Xibaro lavellei
- Xibaro lavellei Zicsi 1997
- Xibaro medioporus
- Xibaro medioporus Zicsi & Csuzdi 2002
- Xibaro pauliani
- Xibaro pauliani Zicsi 1997
- Xibaro Righi 1981
- Xibeiestheria
- Xibeiestheria beishanensis
- Xibeiestheria ovata
- Xibeiestheria ovata Wang 1982
- Xibeiestheria pora
- Xibeiestheria pora Wang 1982
- Xibeiestheria Wang 1982
- Xibeiestheria Wang in Shen Wang & Chen 1982
- Xibeiestheria yanchiensis
- Xibeiestheria yanchiensis Wang 1982
- Xibeiestheria? beishanensis Shen & Chen 1982
- Xiburema virus Xiburema virus ICTV
- Xichangestheria Chen & Shen 1982
- Xichangestheria huiliensis
- Xichangestheria huiliensis Chen & Shen 1982
- Xichonolepis
- Xichonolepis P'an & Wang 1978
- Xichonolepis Pan & Wang 1978
- Xichonolepis qujingensis
- Xichonolepis qujingensis P'an & Wang 1978
- Xichonolepis qujingensis Pan & Wang 1978
- Xichuanella
- Xichuanella Zhao 1989
- Xichuania
- Xichuania YANG in YANG et al. 1991
- xicoi Rol�n 1987
- XIdaeorubus Holub nothosubg.
- Xidazoon
- Xidazoon Shu et al 1999
- Xidazoon Shu, Conway Morris, Zhang, Chen, Li & Han 1999
- Xidazoon stephanus
- Xidazoon stephanus Shu, Conway Morris, Zhang, Chen, Li & Han 1999
- Xiejiawanaspis Burrow, Turner & Wang 2000
- Xiejiawanaspis pinus
- Xiejiawanaspis pinus Burrow, Turner & Wang 2000
- Xiengia
- Xiengia Distant 1921
- Xiengia elongata
- Xiengia elongata Distant 1921
- Xigonus Just & Wilson 2006
- Xigonus patagoniensis
- Xigonus patagoniensis (Winkler 1994)
- Xihaina
- Xihaina aquilonia
- Xihaina aquilonia Keqin & Lianhai 1995
- Xihaina Keqin & Lianhai 1995
- Xihorhynchus
- Xihorhynchus guttatus
- Xikouphyllidae Ding & Yu 1983
- Xikouphyllidae Ding Yunjie & Yu Xueguang 1984
- Xikouphyllum
- Xikouphyllum crassothecum
- Xikouphyllum crassothecum Ding Yunjie & Yu Xueguang 1984
- Xikouphyllum Ding & Yu 1984
- Xikouphyllum Ding Yunjie & Yu Xueguang 1984
- Xikouphyllum dissimtum
- Xikouphyllum dissimtum Ding Yunjie & Yu Xueguang 1984
- Xikouphyllum intermedium
- Xikouphyllum intermedium Ding Yunjie & Yu Xueguang 1984
- Xikouphyllum qinlingense
- Xikouphyllum qinlingense Ding Yunjie & Yu Xueguang 1984
- Xikouphyllum shimenyaense
- Xikouphyllum shimenyaense Ding Yunjie & Yu Xueguang 1984
- Xiletinus Stephens 1829
- Xiletinus Stephens, 1829
- xiligouense Cui et al. 2004
- Xilingoceras
- Xilingoceras elegantum
- Xilingoceras elegantum Xu & Lai 1987
- Xilingoceras Xu & Lai 1987
- Xilingxia
- Xilingxia brevica
- Xilingxia brevica Zhang & Yao 1980
- Xilingxia chengkouensis
- Xilingxia chengkouensis Zhu 1980
- Xilingxia clongata
- Xilingxia convexa
- Xilingxia convexa Xiang & Zhou 1987
- Xilingxia elongata
- Xilingxia elongata Zhu 1987
- Xilingxia Lu 1980
- Xilingxia Lu in Zhang et al 1980
- Xilingxia LU in ZHANG et al. 1980
- Xilingxia Lu in Zhang Lu, Zhu, Qian, Lin, Zhou, Zhang & Yuan 1980
- Xilingxia tenuis
- Xilingxia tenuis Zhang & Yao 1980
- Xilingxiaconus
- Xilingxiaconus Chen Yiyuan & Chang Shushen 1980
- Xilingxiaconus muricatus
- Xilingxiaconus muricatus Chen Yiyuan & Chang Shushen 1980
- Xilingxiaconus simplus
- Xilingxiaconus simplus Chen Yiyuan & Chang Shushen 1980
- Ximacodes affinis
- Ximacodes affinis (Mabille 1890)
- Ximacodes malagasy
- Ximacodes malagasy Viette 1980
- Ximacodes pyrosoma
- Ximacodes pyrosoma (Butler 1882)
- Ximacodes Viette 1980
- Ximena
- Ximenensa
- Ximenensa Cothen.
- Ximenesia
- Ximenesia australis
- Ximenesia australis Hook. & Arn. ex DC.
- Ximenesia Cav.
- Ximenesia Cavanilles 1793
- Ximenesia Cavanilles, 1793
- Ximenesia cavanillesii
- Ximenesia cavanillesii Spreng.
- Ximenesia cordata
- Ximenesia cordata H.B. & K.
- Ximenesia cordata Kunth
- Ximenesia encelioides
- Ximenesia encelioides cana
- Ximenesia encelioides cana DC. p. p.
- Ximenesia encelioides Cav.
- Ximenesia encelioides Cav. var. cana DC.
- Ximenesia encelioides Cav. var. cana DC. p.p.
- Ximenesia encelioides Cav. var. exauriculata (B.L. Rob. & Greenm.) F.C. Gates
- Ximenesia encelioides Cav. var. exauriculata (B.L.Rob. & Greenm.) F.C.Gates
- Xinanocephalus Lee 1978
- Xinanocephalus Lee in Xinan Dizhi Kexue Yanjiusuo 1978
- Xinanocephalus LI 1978
- Xinanocephalus xinanensis
- Xinanocephalus xinanensis Lee 1978
- Xinanopecten
- Xinanopecten Feng, Cui & Liu 1992
- Xinanopecten orbicularis
- Xinanopecten orbicularis Feng, Cui & Liu 1992
- Xinanorthis
- Xinanorthis grandis
- Xinanorthis grandis Xu 1983
- Xinanorthis inflata
- Xinanorthis inflata Xu 1983
- Xinanorthis qoomesensis Popov, Ghobadi Pour, Bassett & Kebria-Ee 2009
- Xinanorthis striata
- Xinanorthis striata Xu, Rong & Liu 1974
- Xinanorthis Xu Rong & Liu 1974
- Xinanorthis Xu, Rong & Liu 1974
- Xinanospirifer
- Xinanospirifer flabellum
- Xinanospirifer flabellum Rong, Xu & Yang 1974
- Xinanospirifer reergouensis
- Xinanospirifer reergouensis Fu 1982
- Xinanospirifer Rong Xu & Yang 1974
- Xinanospirifer Rong, Xu & Yang 1974
- Xinanpetalichthyes
- Xinanpetalichthys
- Xinanpetalichthys P'an & Wang
- Xiomara Gauld 1997
- Xiomara grilloi
- Xiomara grilloi Gauld
- Xiomara grilloi Gauld 1997
- Xiombarg
- Xiombarg Brignoli 1979
- Xiombarg plaumanni
- Xiombarg plaumanni Brignoli 1979
- Xiombarg plaumanni Brignoli, 1979
- Xiongguanlong
- Xiongguanlong baimoensis
- Xipbocercua darlingtoni
- Xipbocercua darlingtoni Cochran 1935
- Xipha
- Xipha Blome 1984
- Xipha Blome, 1984
- Xipha nodosa
- Xipha nodosa Sugiyama 1997
- Xipha pessagnoi
- Xipha pessagnoi (Nakaseko & Nishimura 1979)
- Xipha striata
- Xipha striata Blome 1984
- Xiphacantha
- Xiphacantha alata
- Xiphacantha ciliata
- Xiphacantha emarginata Haeckel,1887
- Xiphacantha Haeckel 1860
- Xiphacantha Haeckel 1861
- Xiphacantha Haeckel 1862
- Xiphacantha Haeckel, 1882
- Xiphacantha quadridentata
- Xiphacantha serrata
- Xiphacantha spinulosa
- Xiphacantha spinulsa
- Xiphacanthidae
- Xiphacanthidium
- Xiphacanthidium Haeckel 1887
- Xiphacanthonia
- Xiphacanthonia Haeckel 1887
- Xiphachistrella
- Xiqilliba bellator
- Xiqilliba bellator Kramer 1964
- Xiqilliba coelidoides
- Xiqilliba coelidoides Linnavuori 1965
- Xiqilliba Kramer 1964
- Xiqilliha bellator
- Xirgoniqua Argaman 1996
- Xiria
- Xiria (Xiria) antica
- Xiria (Xiria) cholobaphes
- Xiria (Xiria) lavinia
- Xiria (Xiria) limbata
- Xiria (Xiria) obliqua
- Xiria (Xiria) violacea
- Xiria (Xiria) violacea Wiedemann, 1830
- Xiria (Xiria) xanthotricha
- Xiria (Xiriella)
- Xiria (Xiriella) clarissa
- Xiria (Xiriella) Frey
- Xiria antica
- Xiria antica Walker
- Xiria antica Walker 1856
- Xiria antica Walker, 1856
- Xiria cholobaphes
- Xiria cholobaphes Assam
- Xiria cholobaphes Hendel
- Xiria cholobaphes Hendel 1914
- Xiria cholobaphes Hendel, 1914
- Xiria clarissa
- Xiria clarissa Frey
- Xiria clarissa Frey 1930
- Xiria clarissa Frey, 1930
- Xiria lavinia
- Xiria lavinia Wulp
- Xiria lavinia Wulp 1899
- xishaense C.K.Tseng & Lu 1979
- xishaensis C.F. Chang & B.M. Xia
- xishaensis C.F. Chang & B.M. Xia 1978
- xishaensis C.K. Tseng & Dong
- xishaensis Chen & Lan 1978
- xishaensis Chen & Wu 1978
- xishaensis Kuang Mei & Xia 1999
- xishaensis Pei 1996
- xishaensis Shen 1978
- xishaensis Sun & Yang 2001
- xishaensis Zou 1978
- xishaensis Zunan 1998
- Xishania
- Xishania fusiformis
- Xishania fusiformis Hong 1981
- Xishania fusiformis Hong 1982
- Xishania Hong 1981
- Xishania Hong 1982
- Xishania Hu 2002
- Xishania Hu in Chen, Luo, Hu, Yin, Jiang, Wu, Li & Chen 2002
- Xishania jiangxiensis Hong Youchong 1988
- Xishania longiusula
- Xishania longiusula Hu 2002
- Xishanidae
- Xishanidae Hong 1981
- Xishanidae Hong 1982
- Xishaniidae
- Xishaniidae Hong 1981
- Xishanocarabus
- Xithocolaptes Gray 1849
- Xitidae
- Xitidae Pessagno 1977
- Xitidae Pessagno, 1977
- Xitus
- Xitus alievi
- Xitus antelopensis
- Xitus antelopensis Pessagno 1977
- Xitus antiquus
- Xitus asymbatos
- Xitus asymbatos (Foreman 1968)
- Xitus bogdanovi
- Xitus bogdanovi Vishnevskaya 1991
- Xitus bonarellii
- Xitus channelli
- Xitus clava
- Xitus decorus
- Xitus decorus Wu 1986
- Xitus elegans
- Xitus gifuensis
- Xitus horridus
- Xitus horridus Jud 1994
- Xitus magnus
- Xitus magnus Baumgartner 1995
- Xitus mclaughlini
- Xitus mclauglini
- Xitus mosquensis
- Xitus mosquensis Vishnevskaya 1998
- Xitus naxiaensis
- Xiuber Powell 1933
- Xiudinium laevigatum
- Xiudinium laevigatum Mao & Norris 1988
- Xiuqiella
- Xiuqiella Chien & Yao 1974
- Xiuqiella Lu Chang, Chien, Chu, Lin, Chou, Chien, Zhang & Wu 1974
- Xiuqiella Lu Chang,Chien,Chu,Lin,Chou,Chien,Zhang & Wu 1974
- Xiuqiella Lu Yen-hao, Chang, Chien Yi-yuan, Chu Chao-ling, Lin Huan-ling, Chow Tse-yi, Chien Yi, Zhang Sen-gui & Wu Hongji 1974
- Xiuqiella meiziwanensis
- Xiuqiella QIAN & YAO 1974
- Xiuqiella rectangula Lu Yen-hao, Chang, Chien Yi-yuan, Chu Chao-ling, Lin Huan-ling, Chow Tse-yi, Chien Yi, Zhang Sen-gui & Wu Hongji 1974
- Xiuqiella shuihegouensis
- Xiuqiella shuihegouensis Zhou 1982
- Xiuqiella? meiziwanensis Zhang & Zhu 1980
- Xiurenbagrus
- Xiurenbagrus Chen & Lundberg 1995
- Xiurenbagrus Chen & Lundberg 1995 sec. Eschmeyer 1998
- Xiurenbagrus Chen & Lundberg 1995 sec. Eschmeyer 2004
- Xiurenbagrus Chen & Lundberg 1995 sec. Zhao, Lan & Zhang 2004
- Xiurenbagrus Chen and Lundberg, 1995
- Xiurenbagrus gigas
- Xiurenbagrus gigas Zhao, Lan & Zhang 2004
- Xiurenbagrus gigas Zhao, Lan & Zhang 2004 sec. Eschmeyer 2004
- Xiurenbagrus gigas Zhao, Lan & Zhang, 2004
- Xiurenbagrus gigas Zhao, Lan and Zhang, 2004
- Xiurenbagrus Xiaoping Chen & Lundberg 1995
- Xiurenbagrus xiurenensis
- Xiurenbagrus xiurenensis (Yue 1981)
- Xiurenbagrus xiurenensis (Yue in Zheng, 1981)
- Xixiaichthys tongxinensis
- Xixiaichthys tongxinensis Zhang 2004
- Xixiaichthys Zhang 2004
- Xixiangella
- Xixiangella Chen Runye 1999
- Xixiangella typa
- Xixiangella typa Chen Runye 1999
- Xixiangethes
- Xixiangethes Qian, Xie & He 2001
- Xixiangethes trapezius
- Xixiangethes trapezius Qian, Xie & He 2001
- Xixias
- Xixias Kissinger 1990
- Xixionopsis
- Xixionopsis Becker & Sanchez de Posada 1977
- Xixionopsis jeanberdanae Becker & Sanchez de Posada 1977
- Xixuthrus
- Xixuthrus (Daemonarthra) helleri Lameere
- Xixuthrus (Daemonarthron)
- Xixuthrus (Xixuthrus)
- Xixuthrus (Xixuthrus) microcerus
- Xixuthrus (Xixuthrus) microcerus White
- Xixuthrus anguis
- Xixuthrus anguis Thomson 1877
- Xixuthrus anguis Thomson, 1877
- Xixuthrus arfakianus
- Xixuthrus arfakianus (Lansberge 1884)
- Xixuthrus arfakianus (Lansberge, 1884)
- Xixuthrus arfakianus Marazzi, Marazzi & Komiya 2006
- Xiyingia alta
- Xiyingia alta Bojie 1978
- Xiyingia ambita
- Xiyingia ambita Bojie 1978
- Xiyingia Bojie 1978
- Xiyingia Bojie in 1978
- Xiyingia cuneata
- Xiyingia cuneata He 1981
- Xiyingia elliptica
- Xiyingia elliptica Bojie 1978
- Xiyingia longa
- Xiyingia longa Bojie 1978
- Xiyingia luminosa
- Xiyingia luminosa Bojie 1978
- Xiyingia magna
- Xiyingia magna Bojie 1978
- Xiyukannemeyeria
- Xiyukannemeyeria brevirostris
- Xiyukannemeyeria brevirostris (Sun 1978)
- Xiyukannemeyeria Liu & Li 2003
- Xizanamias Chao 1980
- Xizangia
- Xizangia bartschioides
- Xizangia bartschioides (Hand.-Mazz.) C.Y. Wu & D.D. Tao
- Xizangia bartschioides (Hand.-Mazz.) D.Y. Hong
- Xizangia bartschioides (Hand.-Mazz.) D.Y.Hong
- Xizangia bartschioides (Handel-Mazzetti) D. Y. Hong
- Xizangia bartsioides
- Xizangia bartsioides (Hand.-Mazz.) C.Y.Wu & D.D.Tao
- Xizangia cryptonychus
- Xizangia cryptonychus Zhang 1988
- Xizangia D. Y. Hong, 1986
- Xizangia D.Y. Hong
- Xizangia D.Y. Hong 1986
- Xizangia D.Y.Hong
- Xizangia linzhiensis
- Xizangia linzhiensis (Hu 2001)
- Xizangia linzhiensis (Hu, 2001)
- Xizangia machalensis
- Xizangia machalensis Zhang 1982
- Xizangia rigaze
- Xizangia rigaze Song, Zhu & Zhang 2004
- Xizangia rigaze Song, Zhu & Zhang, 2004
- Xizangia serrata
- Xizangia serrata D.Y. Hong
- Xizangia serrata D.Y.Hong
- Xizangia Zhang 1982
- Xizangia Zhang 1988
- Xizangichnum
- XLeydeum Barkworth
- [[XLeydeum Barkworth, 1997 [1998]]]
- XLeydeum dutillyanum
- XLeydeum dutillyanum (Lepage) Barkworth
- [[XLeydeum dutillyanum (Lepage) Barkworth, 1997 [1998]]]
- XLeydeum piperi
- XLeydeum piperi (Bowden) Barkworth
- [[XLeydeum piperi (Bowden) Barkworth, 1997 [1998]]]
- XLeymopyron
- XLeymopyron bergrothii
- XLeymopyron bergrothii (H. Lindb.) Tzvelev
- XLeymopyron Tzvelev
- XLeymostachys
- XLeymostachys korovinii
- XLeymostachys korovinii Tzvelev
- XLeymostachys Tzvelev
- XLeymotrigia
- XLeymotrigia bergrothii
- XLeymotrigia bergrothii (H. Lindb.) Tzvelev
- XLeymotrigia bergrothii (Lindb. f.) Tzvelev
- Xleymotrigia pacifica
- Xleymotrigia pacifica Prob.
- XLeymotrigia roshevitzii
- XLeymotrigia roshevitzii Tzvelev
- XLeymotrigia stricta
- XLeymotrigia stricta (Dethard.) Tzvelev
- XLeymotrigia Tzvelev
- XLeymotrigia wiluica
- XLeymotrigia wiluica (Drobow) Tzvelev
- Xlphinema diversicaudatum
- Xlphinema italiae
- Xlphiorhynchus priscus
- Xlphophorus
- Xlphophorus maculatus
- Xlumnus Galil & Takeda 1988
- XLycida Oakeley
- XMaltea B. Boivin
- XMaltea B. Boivin, 1967
- XMaltea vacillans
- XMaltea vacillans (Th. Fr.) B. Boivin
- XMaltea vacillans (Th. Fr.) B. Boivin, 1967
- XNeomea marnieri M.B. Foster
- XNeophytum lymanii
- XNeophytum lymanii Foster
- XNidumea loesneri L.B. Sm.
- Xoanodera
- Xoanodera (Lajoyeia) grossepunctata Gressitt & Rondon 1970
- Xoanodera (Lajoyeia) striata Gressitt & Rondon 1970
- Xoanodera (Lajoyeia) vitticollis (Gahan 1891)
- Xoanodera ? vitticollis
- Xoanodera alia
- Xoanodera alia Holzschuh 2003
- Xoanodera alia HOLZSCHUH Carolus, 2003
- Xoanodera alia Holzschuh, 2003
- Xoanodera amaena
- Xoanodera amoena
- Xoanodera amoena Pascoe 1885
- Xoanodera amoena Pascoe, 1885
- Xoanodera amÂœna Gahan, 1906
- Xoanodera amœna
- Xoanodera amœna Gahan, 1906
- Xoanodera am�na Gahan 1906
- Xoanodera angustula
- Xoanodera angustula Holzschuh 2006
- Xoanodera asphyxa
- Xoanodera asphyxa Franz 1972
- Xoanodera asphyxa FRANZ Elli, 1972
- Xoanodera asphyxa Franz, 1972
- Xoanodera asphyxa Holzschuh 2005
- Xoanodera asphyxa Holzschuh, 2005
- Xoanodera grossepunctata
- Xoanodera grossepunctata Gressitt & Rondon 1970
- Xoanodera grossepunctata Gressitt & Rondon, 1970
- Xoanodera grossepunctata GRESSITT J. L., RONDON J. A., 1970
- Xobugirado Eichler 1949
- Xoenia Duchassaing & Michelotti 1860
- Xoes
- Xoes egeria
- Xoes egeria Breuning 1944
- Xoes egeria Breuning, 1944
- Xoes egeria Pascoe 1866
- Xoes egeria PASCOE Francis Polkinghorne, 1866
- Xoes egeria Pascoe, 1866
- Xoes irroratus
- Xoes irroratus Heller 1925
- Xoes Pasco 1866
- Xoes Pascoe 1865
- XÅ“napta
- XÅ“napta nigrosignata
- XÅ“napta nigrosignata Pic, 1936
- Xoidolema Heinze 1931
- Xoidolema Henize 1931
- Xoidolema rhodesiana
- Xoidolema rhodesiana Heinze 1931
- Xois
- Xois arctoa
- Xois arctoa arctoa
- Xois arctoa Fabricius
- Xois arctous
- Xois arctous (Fabricius 1775)
- Xois arctous (Fabricius) 1775
- Xois arctous arctous
- Xois fulvida
- Xois Hewitson 1865
- Xois sesara
- Xois sesara Hew.
- Xois sesara hewitson
- Xois sesara Hewitson 1865
- Xois sesara Hewitson, 1865
- Xoklengana Carvalho & Rosas 1965
- Xoklengana sulina
- Xoklengana sulina Carvalho & Rosas 1965
- Xola Heller 1910
- [[Xola Heller [1910]]]
- Xola notabilis
- Xola notabilis Heller 1910
- Xola notabilis Heller, 1910
- Xolalges
- Xolalges alexeevi
- Xolalges alexeevi Chirov & Mironov 1983
- Xolalges analginus
- Xolalges analginus Trouessart 1886
- Xolalges arrhenurus
- Xolalges arrhenurus Gaud & Mouchet 1959
- Xolalges palliatus
- Xolalges scaurus
- Xolalges scaurus Trouessart 1885
- Xolalges Trouessart 1885
- Xolalges Trouessart 1887
- Xolalgidae
- Xolalgidae Dubinin 1953
- Xolalginae
- Xolalginae Dubinin 1953
- Xolalgoides
- Xolalgoides alexeevi
- Xolalgoides alexeevi (Chirov & Mironov 1983)
- Xolalgoides Gaud 1979
- Xolalgoides palmai
- Xolalgoides palmai Mironov & Perez 2002
- Xolantha
- Xolantha acuminata
- Xomacris cryptica
- Xomacris cryptica Amédégnato & Poulain 1986
- Xomacris cryptica Amédégnato & Poulain, 1986
- Xomacris cryptica Am�d�gnato & Poulain 1986
- Xomacris nuptialis
- Xomacris nuptialis (Gerstaecker 1889)
- Xomacris nuptialis (Gerstaecker, 1889)
- Xomacris Rehn 1955
- Xomacris riedei
- Xomacris riedei Otte, D. 1995
- Xomacris riedei Otte, D., 1995
- Xomacris riederi
- Xomacris riederi Amédégnato & Poulain 1986
- Xomacris riederi Amédégnato & Poulain, 1986
- Xomacris riederi Am�d�gnato & Poulain 1986
- Xomacris spec. Rehn, 1955
- Xomana
- Xomana G.-Tos
- Xomana Giglio-Tos 1898
- Xomana gonagra
- Xomana gonagra (Gerstaecker 1889)
- Xomana gonagra (Gerstaecker, 1889)
- Xomana nuptialis
- Xomana nuptialis (Gerstaecker 1889)
- Xomana nuptialis (Gerstaecker, 1889)
- Xomana nuptialis Gerst.
- Xomyobuthus
- Xonpepetla Cifuentes-Ruiz & Vrsansky 2006
- Xonpepetla rinconensis Cifuentes-Ruiz & Vrsansky 2006
- xorae Smith 1958
- Xorathes
- Xorathes Gilmour 1963
- Xorathes guianensis
- Xorathes guianensis Gilmour 1963
- Xorathes guianensis Gilmour 1965
- Xorathes guianensis GILMOUR E. Forrest, 1963
- Xorathes guianensis Gilmour, 1963
- Xorathes guianensis Gilmour, 1965
- XOrchicoeloglossum
- XOrchicoeloglossum Asch. & Graebn.
- XOrchicoeloglossum turcestanicum
- XOrchicoeloglossum turcestanicum G. Keller & Soó
- Xorema
- Xorema Reitter 1901
- Xorema Reitter 1903
- Xorema thibetana
- Xorema thibetana Reitter 1903
- Xoria
- Xoria fascifera
- Xoria fascifera (Holland 1894)
- Xoria filifera
- Xoria filifera (Walker in Chapman 1869)
- Xoria filifera Walker 1869
- Xoria Nye 1975
- Xoria orthogramma
- Xoria orthogramma Bethune-Baker 1909
- Xorida
- Xorida Blanchard 1840
- Xosa Kirkaldy 1904
- Xosablatta
- Xosablatta bitaeniata
- Xosablatta bitaeniata Princis 1963
- Xosablatta bitaeniata Princis, 1963
- Xosablatta bitaeniata Princis,1963
- Xosablatta caffra
- Xosablatta caffra (Saussure 1899)
- Xosablatta caffra (Saussure, 1899)
- Xosablatta caffra (Saussure,1899)
- Xosablatta inconspicua
- Xosablatta inconspicua (Brunner v. W.,1865)
- Xosablatta inconspicua (Brunner von Wattenwyl 1865)
- Xosablatta inconspicua (Brunner von Wattenwyl, 1865)
- Xosablatta intermedia
- Xosablatta intermedia Princis 1963
- Xosablatta intermedia Princis, 1963
- Xosablatta intermedia Princis,1963
- Xosablatta lobipennis
- Xosablatta lobipennis Princis 1963
- Xosablatta lobipennis Princis, 1963
- Xosablatta lobipennis Princis,1963
- Xosablatta misella
- Xosablatta misella (Stål 1856)
- Xosablatta misella (Stål, 1856)
- Xosablatta misella (St�l 1856)
- Xosablatta natalensis
- Xosablatta natalensis (Rehn, J. A. G. 1922)
- Xosablatta natalensis (Rehn, J. A. G., 1922)
- Xotidium Lobl 1992
- Xotidium montanum
- Xotidium montanum (Lobl 1971)
- Xotidium notatum
- Xotidium notatum (Lobl 1977)
- Xotidium pygmaeum
- Xotidium pygmaeum (Lobl 1971)
- Xotidium uniforme
- Xotidium uniforme Lobl 1992
- Xotodon
- Xotodon ambrosettii
- Xotodon Ameghino
- Xotodon Ameghino 1887
- Xotodon cf X smaltatus
- Xotodon cristatus
- Xotodon cristatus Moreno & Mercerat 1891
- Xotodon doellojuradi
- Xotodon foricurvatus
- Xotodon foricurvatus Ameghino 1887
- Xotodon major
- Xotoprodon
- Xotoprodon Ameghino 1891
- Xotoprodon maximus
- Xotoprodon maximus Ameghino 1891
- Xotoprodon solidus
- Xotoprodon solidus Ameghino 1891
- xouthos Killeen & Oliver 2000
- Xouthous
- Xouthous aemula (Thompson I.C. & Scott A., 1903)
- Xouthous laticauda (Thompson I.C. & Scott A., 1903)
- Xouthous maldiviae
- Xouthous maldiviae Sewell 1940
- Xouthous maldiviae Sewell, 1940
- Xouthous novaezealandiae Thomson G.M., 1883
- Xouthous purpurocinctum
- Xouthous purpurocinctum (Norman & Scott T., 1906)
- Xouthous Thomson 1882
- Xouthous Thomson 1883
- Xoxylon Raf.
- Xpacherocactus orcuttii (K.Brandegee) Rowley
- XPityromeria concolor
- XPityromeria concolor (Baker) L.D. Gómez
- XPityromeria florentina
- XPityromeria florentina L.D. Gómez
- XPityromeria herzogii
- XPityromeria herzogii (Rosenst.) L.D. Gómez
- XPityromeria L.D. Gómez
- XPityromeria longipes
- XPityromeria longipes (Baker) L.D. Gómez
- XPleopodium bartlettii
- XPleopodium bartlettii (Weath.) Mickel & Beitel
- XPleopodium fallacissimum
- XPleopodium fallacissimum (Maxon) Mickel & Beitel
- XPleopodium leucosporum
- XPleopodium leucosporum (Klotzsch) Mickel & Beitel
- XPleopodium Schelpe & N.C. Anthony
- XPleopodium simianum
- XPleopodium simianum Schelpe & N.C. Anthony
- XPleopodium tricholepis
- XPleopodium tricholepis Mickel & Beitel
- XPleuroderris
- XPleuroderris Maxon (pro sp.)
- XPleuroderris michleriana
- XPleuroderris michleriana (D.C. Eaton) Maxon (pro sp.)
- XPolypogonagrostis Maire & H. Weiler
- XPseudanthera breadalbanensis
- XPseudanthera breadalbanensis McKean
- XPseudanthera McKean
- XPseudelymus
- XPseudelymus Barkworth & D.R. Dewey
- XPseudelymus Barkworth & D.R. Dewey, 1984
- XPseudelymus saxicola
- XPseudelymus saxicola (Scribn. & J.G. Sm.) Barkworth & D.R. Dewey
- XPseudelymus saxicola (Scribn. & J.G. Sm.) Barkworth & D.R. Dewey, 1983
- XPseudelymus saxicola (Scribn. & J.G. Sm.) Barkworth & D.R. Dewey, 1985
- XPucciphippsia czukczorum
- XPucciphippsia czukczorum Tzvelev
- XPucciphippsia Tzvelev
- XPucciphippsia Tzvelev, 1971
- XPucciphippsia vacillans
- XPucciphippsia vacillans (Th. Fr.) Tzvelev
- XPucciphippsia vacillans (Th. Fr.) Tzvelev, 1971
- Xqxsyguvanocoleina Perkovsky 2002
- XRhodobranthus molfinoi
- XRhodobranthus molfinoi Traub
- XRhodobranthus Traub
- XRhodobranthus woelfleanus
- XRhodobranthus woelfleanus Traub
- XRhodocinium
- XRhodocinium Avror.
- XRhodocinium intermedium
- XRhodocinium intermedium (Ruthe) Avror.
- XSasinaria ikegamii (Nakai) Demoly
- XSchedolium brinkmanii
- XSchedolium brinkmanii (A. Braun) Holub
- XSchedolium holmbergii
- XSchedolium holmbergii (Dörfl.) Holub
- XSchedolium Holub
- XSchedolium Holub, 1998
- XSchedolium loliaceum
- XSchedolium loliaceum (Huds.) Holub
- XSchedolium loliaceum (Huds.) Holub, 1998
- XSchedololium
- XSchedololium braunii
- XSchedololium braunii (K. Richt.) Soreng & Terrell
- XSchedololium brinkmannii
- XSchedololium brinkmannii (A. Braun) Soreng & Terrell
- XSchedololium holmbergii
- XSchedololium holmbergii (Dörfl.) Soreng & Terrell
- XSchedololium loliaceum
- XSchedololium loliaceum (Huds.) Soreng & Terrell
- [[XSchedololium loliaceum (Huds.) Soreng & Terrell, 1997 [1998]]]
- XSchedololium nilssonii
- XSchedololium nilssonii (Cugnac & A. Camus) Soreng & Terrell
- XSchedololium Soreng & Terrell
- [[XSchedololium Soreng & Terrell, 1997 [1998]]]
- XSecalotricum Kostov
- XSecalotricum Kostov, 1936
- XSecalotricum saratoviense
- XSecalotricum saratoviense Kostov
- Xsedadia
- XSeleniphyllum
- XSeleniphyllum cooperi
- XSeleniphyllum cooperi Kimnach
- XSitordeum Bowden
- XSitordeum Bowden, 1967
- XSitordeum californicum
- XSitordeum californicum Bowden
- XSitordeum californicum Bowden, 1967
- XSorbocoteneaster Pojark.
- XSorbocotoneaster
- XSorbocotoneaster Pojark.
- XSorbocotoneaster pozdnjakovii
- XSorbocotoneaster pozdnjakovii Pojark.
- Xsosaites
- Xsosaites Bandel & Dockery 2001
- XStiporyzopsis B.L. Johnson & Rogler
- XStiporyzopsis B.L. Johnson & Rogler, 1943
- XStiporyzopsis bloomeri
- XStiporyzopsis bloomeri (Bol.) B.L. Johnson
- XStiporyzopsis bloomeri (Bol.) B.L. Johnson, 1945
- XStiporyzopsis caduca
- XStiporyzopsis caduca (Beal) B.L. Johnson & Rogler
- XStiporyzopsis caduca (Beal) B.L. Johnson & Rogler, 1943
- XStuernia
- XStuernia P.V. Heath
- XSydneya castellanosii
- XSydneya castellanosii Traub
- XSydneya Traub
- Xsyletinus
- Xsyletinus Frivaldszky 1835
- Xsylina
- Xsylina freyeri
- Xsylina freyeri Frivaldszky 1835
- Xsylina Frivaldszky 1835
- Xsytrella
- XTacipetalum C.H. Uhl
- XTaciphytum
- XTaciphytum C.H. Uhl
- XTerrelymus B.R. Baum
- XTerrelymus B.R. Baum, 1979
- XTerrelymus maltei
- XTerrelymus maltei (Bowden) B.R. Baum
- XTerrelymus maltei (Bowden) B.R. Baum, 1979
- XToisochosenia Kimura
- XToisochosenia tatewakii
- XToisochosenia tatewakii Kimura
- XTrisetokoeleria gorodkowii
- XTrisetokoeleria gorodkowii (Roshev.) Tzvelev
- XTrisetokoeleria jurtzevii
- XTrisetokoeleria jurtzevii Prob.
- XTrisetokoeleria rimpaui
- XTrisetokoeleria rimpaui (Wittm.) Muntz.
- XTrisetokoeleria taimyrica
- XTrisetokoeleria taimyrica Tzvelev
- XTrisetokoeleria Tzvelev
- XTriticale
- XTriticale aestivum
- XTriticale aestivum Sánchez-Monge
- XTriticale carthlico-vavilovi
- XTriticale carthlico-vavilovi B.R. Baum
- XTriticale dicoccocereale
- XTriticale dicoccocereale B.R. Baum
- XTriticale dicoccoidecereale
- XTriticale dicoccoidecereale B.R. Baum
- XTriticale dicoccoides
- XTriticale dicoccoides Sánchez-Monge
- XTriticale dicoccum
- XTriticale dicoccum Sánchez-Monge
- XTriticale duro-montanum
- XTriticale duro-montanum B.R. Baum
- XTriticale durocereale
- XTriticale durocereale B.R. Baum
- XTriticale durum
- XTriticale durum Sánchez-Monge
- XTriticale hexaploide
- XTsugo-Picea
- XTsugo-Picea hookeriana
- XTsugo-Picea M. van Campo-Duplan & H. Gaussen
- XTsugo-Picea X hookeriana Van Campo-Duplan & Gauss
- XTsugo-Piceo-Picea
- XTsugo-Piceo-Picea M. van Campo-Duplan & H. Gaussen
- XTsugo-Piceo-Tsuga
- XTsugo-Piceo-Tsuga jeffreyi
- XTsugo-Piceo-Tsuga jeffreyi (Henry) Van Campo & Gaussen
- XTsugo-Piceo-Tsuga van Campo & Gaussen
- Xuanchengospira flexilabrosa
- Xuanchengospira flexilabrosa Yu 1982
- Xuanchengospira Yu 1982
- Xuanchengospira Yu in Yu Pan & Wang 1982
- Xuanenia
- Xuanenia granulosa T-M Zhou
- Xuanenia splendia
- Xuanenia splendia Ju 1983
- Xuanenia T-M Zhou
- Xuanenia Zhou 1977
- Xuanenia ZHOU in ZHOU et al. 1977
- Xuanenoceras
- Xuanenoceras bovigulatum
- Xuanenoceras bovigulatum Xu 1977
- Xuanenoceras Xu 1977
- Xuanenoceras Xu in 1977
- Xuanhanosaurus
- Xuanhanosaurus Dong Zhiming 1984
- Xuanhanosaurus qilixiaensis
- Xuanhanosaurus qilixiaensis Dong Zhiming 1984
- Xuanhuaceratops
- Xuanhuaceratops niei
- Xuanhuaceratops niei Zhao, Cheng, Xu & Makovicky 2006
- Xuanhuaceratops Zhao, Cheng, Xu & Makovicky 2006
- Xuaresia
- Xuaresia Pers.
- Xuarezia
- Xuarezia biflora
- Xuarezia biflora Ruiz & Pav.
- Xubida cayugella
- Xubida chiloidellus
- Xubida chiloidellus (Barnes and McDunnough 1913)
- Xubida dentilineatella
- Xubida dentilineatella (Barnes and McDunnough 1913)
- Xubida dentilineella
- Xubida dentilneatella (Barnes & McDunnough )
- Xubida infusellus
- Xubida linearellus
- Xubida linearellus (Zeller 1863)
- Xubida lipan
- Xubida lipan Klots 1970
- Xubida minorella
- Xubida narinella
- Xubida panalope
- Xubida panalope (Dyar 1917)
- Xubida punctilineella
- Xubida punctilineella (Barnes and McDunnough 1913)
- Xubida puritella
- Xubida puritella (Kearfott 1908)
- Xubida relovae
- Xubida relovae Klots 1970
- Xubida rutubella
- Xubida rutubella Schaus
- Xubida Schaus 1922
- Xubida strictalis
- Xubida strictalis Dyar
- Xubida venadialis
- Xucossus
- Xucossus Hong 1983
- Xucossus zhouyingziensis
- Xucossus zhouyingziensis Hong 1983
- Xueia simplex
- Xueia simplex Ying 2000
- Xueia Ying 2000
- Xuella
- Xuella Verves 1997
- Xueshimys
- Xueshimys dissectus
- Xueshimys dissectus Tong 1997
- Xueshimys Tong 1997
- Xuidinium
- Xuidinium Mao & Morris 1988
- Xuidinium Mao & Norris 1988
- Xuigiella
- Xulapona cara Mello-Leitao 1936
- Xulapona Mello-Leitão 1936
- Xulinosprionites
- Xulinosprionites Bowerbank 1840
- Xulinosprionites Bowerbank, 1840
- Xulora
- Xulora Walker 1855
- Xundarava anomala Mello-Leitao 1936
- Xundarava Mello-Leitão 1927
- Xundiania
- Xundiania LUO in LUO et al. 1994
- Xunjiansiella
- Xunjiansiella Hua & Jian 1993
- Xunjiansiella Hua & Jian in Hu Jian & Hua 1993
- Xunjiansiella longa
- Xunjiansiella longa Jian & Hua 1993
- Xunjiansiella orthis
- Xunjiansiella orthis Jian & Hua 1993
- Xunjiansiella retroswinga
- Xunjiansiella retroswinga Hua & Hu 1993
- Xunjiansiella simplex
- Xunjiansiella simplex Hua & Hu 1993
- Xunthia ceramodes
- Xunthia fulvago flavescens
- Xunthia fulvago var. flavescens
- Xuodon Kretzoi & Kretzoi 2000
- Xuphocerus cruciger
- Xuphocerus cruciger Loew
- Xuphocerus quadrimaculatus
- Xuphocerus quadrimaculatus Loew
- Xuphocerus reynaudii
- Xuphocerus reynaudii Macquart
- Xuptosiphum
- Xuptosiphum de Laubenfels 1950
- Xuptosiphum kaneobe
- Xuptosiphum kaneobe de Laubenfels 1950
- Xuraphidia kezuoensis Hong 1922
- Xurel
- Xurel Jordan & Evermann 1927
- Xurel Jordan & Evermann 1927 sec. Eschmeyer 1998
- Xurel Jordan & Evermann 1927 sec. Eschmeyer 2004
- Xurel lata
- Xurel lata Agassiz 1831
- Xurel lata Agassiz, 1831
- Xurel tenebrosus
- Xuriella
- Xuriella marmorea
- Xuriella marmorea Wesolowska & van Harten 2007
- Xuriella marmorea Wesolowska & van Harten, 2007
- Xuriella prima
- Xuriella prima Wesolowska & Russell-Smith 2000
- Xuriella prima Wesolowska & Russell-Smith, 2000
- Xuriella Wesolowska & Russell-Smith 2000
- Xuris
- Xuris Adans.
- Xuris Adanson 1763
- Xuris Adanson, 1763
- Xuris fistulosa
- Xuris fistulosa Raf.
- Xuris Raf.
- Xustrostoma Adamson & van Waerebeke 1984
- Xustrostoma margarettae
- Xustrostoma margarettae Adamson & van Waerebeke 1984
- Xustrostoma stenoboli
- Xustrostoma stenoboli van
- Xustrostoma stenoboli van Waerebeke 1988
- Xustrostomatidae
- Xustrostomatidae Hunt 2002
- xutha de Laubenfels 1954
- xutha Randall 1988
- Xuthea
- Xuthea (Paraxuthea)
- Xuthea (Paraxuthea) leonardii
- Xuthea (Paraxuthea) leonardii Medvedev 1997
- Xuthea (Paraxuthea) Medvedev 1997
- Xuthea (Paraxuthea) nigripes
- Xuthea (Paraxuthea) nigripes Medvedev 2004
- Xuthea (Paraxuthea) pallida
- Xuthea (Paraxuthea) pallida Medvedev 1997
- Xuthea (Xuthea) coerulea
- Xuthea (Xuthea) coerulea Medvedev 1997
- Xuthea ? formosa
- Xuthea Baly
- Xuthea Baly 1865
- Xuthea bengalensis
- Xuthea bengalensis Sengupta & Basu 1977
- Xuthea coerulea
- Xuthea elliptica
- Xuthea elliptica Sengupta & Basu 1977
- Xuthea formosa
- Xuthea formosa Blackburn 1896
- Xuthea fulvitarsis
- Xuthea fulvitarsis Scherer 1969
- Xuthea geminalis
- Xuthea geminalis Wang 1992
- Xuthea laevicollis
- Xuthea laevicollis Chen 1933
- Xuwenospira rara
- Xuwenospira rara Wang 1982
- Xuwenospira Wang 1982
- Xuzhougnathus Ding & Wan 1990
- Xuzhougnathus monoridgosus
- Xuzhougnathus monoridgosus Ding & Wan 1990
- Xuzhouia
- Xuzhouia QIU 1980
- Xuzhouia zhanglouensis
- Xuzhouia zhanglouensis Qiu 1980
- Xvlanthribus Kuschel 1998
- XVriecantarea J.R. Grant
- XWhitesloaniopsis Barad
- xxx clarandus
- xxx clarandus Collin
- xxx confusa
- xxx confusa Wahlgren
- xxx fallax De Meijere, xxx
- xxx fallax xxx
- xxx fasciata
- xxx fasciata Meigen
- xxx flava Staeger, xxxx
- xxx flava xxxx
- xxx formosa Frey, xxx
- xxx formosa xxx
- xxx gracilipes Wahlgren, xxx
- xxx gracilipes xxx
- xxx iners
- xxx iners Meigen
- xxx mikii
- xxx nigra xxxx
- xxx nigra Zetterstedt, xxxx
- xxx nigricornis
- xxx nigricornis Fabricius
- xxx ornata
- xxx ornata Loew
- xxx parthenia Kowarz , xxx
- xxx parthenia xxx
- xxx rostrata
- xxx rostrata Zetterstedt
- xxx ruficeps
- xxx ruficeps Zetterstedt
- Xya albiantennata
- Xya albiantennata Gunther 1995
- Xya albiantennata Günther, K. 1995
- Xya albiantennata Günther, K.K. 1995
- Xya albiantennata Günther, K.K., 1995
- Xya albiantennata Günther, Klaus 1995
- Xya albiantennata Günther, Klaus, 1995
- Xya albiantennata G�nther, K.K. 1995
- Xya albigenata
- Xya albigenata Gunther 1995
- Xya albigenata Günther, K. 1995
- Xya albigenata Günther, K.K. 1995
- Xya albigenata Günther, K.K., 1995
- Xya albigenata Günther, Klaus 1995
- Xya albigenata Günther, Klaus, 1995
- Xya albigenata G�nther, K.K. 1995
- Xya albipalpis
- Xya albipalpis (Chopard 1933)
- Xya albipalpis (Chopard 1934)
- Xya albipalpis (Chopard, 1933)
- Xya ancarafantisca
- Xya ancarafantsica
- Xya ancarafantsica Gunther 1982
- Xya ancarafantsika
- Xya ancarafantsika Günther, K. 1982
- Xya ancarafantsika Günther, K.K. 1982
- Xya ancarafantsika Günther, K.K., 1982
- Xya ancarafantsika Günther, Klaus 1982
- Xya ancarafantsika Günther, Klaus, 1982
- Xybarida nasicola
- Xybarida nasicola Park 1942
- Xybarida punctulum
- Xybarida Raffray 1897
- Xybarida trimioides
- Xybarida trimioides (Sharp 1887)
- Xybaris
- Xybaris auritula
- Xybaris auritula Westw.
- Xybaris funiculis
- Xybaris funiculis (Park 1942)
- Xybaris funiculus
- Xybaris funiculus Park 1943
- Xybaris quadraliceps
- Xybaris Reitt.
- Xybaris Reitter 1882
- Xybaris spiniceps
- Xybaris spiniceps Reitt.
- Xybaris spniceps
- Xybota
- Xybota cuprina
- Xybribates pembertoni
- Xybribates pembertoni Jacot 1934
- Xyccarph Brignoli 1978
- Xyccarph migrans
- Xyccarph migrans Hofer & Brescovit 1996
- Xyccarph migrans Höfer & Brescovit, 1996
- Xyccarph migrans H¿fer & Brescovit 1996
- Xyccarph migrans Hâ€fer & Brescovit, 1996
- Xyccarph migrans H�fer & Brescovit 1996
- Xyccarph myops
- Xyccarph myops Brignoli 1978
- Xyccarph myops Brignoli, 1978
- Xyccarph tenuis
- Xyccarph tenuis (Vellard 1924)
- Xyccarph tenuis (Vellard, 1924)
- Xyccarph wellingtoni
- Xyccarph wellingtoni Hofer & Brescovit 1996
- Xyccarph wellingtoni Höfer & Brescovit, 1996
- Xyccarph wellingtoni H¿fer & Brescovit 1996
- Xyccarph wellingtoni Hâ€fer & Brescovit, 1996
- Xyccarph wellingtoni H�fer & Brescovit 1996
- Xychusa
- Xychusa larvata
- Xychusa Pascoe 1871
- Xycla
- Xyclohelyx
- Xyclohelyx Paetel 1888
- Xycoloris
- Xycoloris Dufour 1833
- Xydrargyrus Dumeril 1806
- Xyela (Pinicolites)
- Xyela (Pinicolites) lata
- Xyela (Pinicolites) lata Smith 1990
- Xyela (Pinicolites) Meunier 1920
- Xyela (X.) ussuriensis
- Xyela (Xyela) florissantensis
- Xyela (Xyela) florissantensis Rasnitsyn 1995
- Xyela (Xyela) lata Smith 1990
- Xyela (Xyela) micrura
- Xyela (Xyela) micrura Rasnitsyn 1995
- Xyela alberta
- Xyela alberta (Curran)
- Xyela alberta Curran 1923
- Xyela alni
- Xyela alni Rohw.
- Xyela alpigena
- Xyela alpigena (Strobl 1895)
- Xyela alpigena (Strobl)
- Xyela alpigena (Strobl, 1895)
- Xyela alpigena group
- Xyela alpigena group Strobl
- Xyela alpigena Strobl
- Xyela alpigena Strobl 1895
- Xyela angustipennis
- Xyela bakeri
- Xyela bakeri Kon.
- Xyela bakeri Konow
- Xyela bakeri Konow 1898
- Xyela bakeri Konow, 1898
- Xygographa asaphochalca
- Xygographa asaphochalca Meyrick 1917
- Xygographa Meyrick 1917
- Xyhophanes mossi
- Xyhophanes mossi Clark 1917
- Xyhophanes tyndarus marginalis
- Xyhphaga
- Xyhphasia flavistigma
- Xyhphasia leucostigma
- Xyhryctes florensis
- Xyhtdes pattersoni
- Xyhtrya
- Xyinias cynosema
- Xyiolestes
- Xyiolestes Lefkovitch 1962
- Xykborus maiche
- Xykborus maiche Stark
- Xykborus mniche
- Xykborus mniche Eggers 1942
- Xykborus pardous
- Xykborus pardous Eggers 1943
- Xykborus pseudobrasiliensis
- Xykeborus fornicatus
- Xyktinus hanseni
- Xyktinus hanseni Jansson 1947
- Xyktinus robustus
- Xyktinus robustus Pic 1946
- Xyla schliebenii Harms (1934)
- Xylabion
- Xylabion ? elongatum (Cooper 1930)
- Xylabion ? sp.
- Xylabion gelasinosum
- Xylabion helgoense
- Xylabion helgoense (Nikoleisen 1961)
- Xylabion helgoeyense
- Xylabion helgoeyense (Nikolaisen 1961)
- Xylabion LANE 1971
- xylabion Paulin 1993
- Xylabion platycanthum
- Xylabion platycanthum (Bradley 1930)
- Xylabion sexermis
- Xylabion sexermis (Opik 1937)
- Xylabion sexermis (Öpik, 1937)
- Xylabion? ruedemanni (Raymond 1916)
- Xylabion? susceptum
- Xylacanthus
- Xylacanthus grandis
- Xylacanthus grandis Orvig 1967
- Xylacanthus kenstewarti
- Xylacanthus kenstewarti Hanke, Wilson & Lindoe 2001
- Xylacanthus minutus
- Xylacanthus minutus Gagnier & Goujet 1997
- Xylacanthus Orvig 1967
- Xylacis
- Xylacis echthroides
- Xylacis echthroides (Porter)
- Xymalobium Steud.
- Xymalos
- Xymalos Baill.
- Xymalos Baill. & Warb.
- Xymalos Baillon 1887
- Xymalos Baillon ex Warb.
- Xymalos Baillon, 1887
- Xymalos monospora
- Xymalos monospora (Harv.) Baill.
- Xymalos monospora (Harv.) Baill. ex Warb.
- Xymalos monospora (Harv.) Baillon ex Warb.
- Xymalos monospora (Harvey) Baillon ex Warb.
- Xymalos monospora Baill.
- Xymalos mossambicensis
- Xymalos mossambicensis Cavaco
- Xymalos ulugurensis
- Xymalos ulugurensis (Engl.) Engl.
- Xymalos usambarensis
- Xymalos usambarensis Engl.
- Xymaloxylon
- Xymaloxylon P. Louvet 1975
- Xymaloxylon P. Louvet, 1975
- Xymaloxylon zeltenense
- Xymehops
- Xymehops nigra
- Xymehops nigra Viette 1954
- Xymehops Viette 1954
- Xymene
- Xymene ambiguus
- Xynaea Pascoe
- Xynaea Pascoe 1865
- Xynaea saginata
- Xynaea saginata Pascoe 1865
- Xynaea saginata Pascoe, 1865
- Xynaea saginata Pascoe, F.P. 1865
- Xynaea saginata Pascoe, F.P., 1865
- Xynaea uniformis
- Xynaea uniformis Lea 1904
- Xynaea uniformis Lea, 1904
- Xynaea uniformis Lea, A.M. 1904
- Xynaea uniformis Lea, A.M., 1904
- Xyne
- Xyne fltgeri
- Xyne fltgeri Jordan & Gilbert 1920
- Xyne grex
- Xyne grex Jordan & Gilbert 1919
- Xyne Jordan & Gilbert 1919
- Xynea uniformis
- Xynea uniformis Lea 1904
- Xynedria
- Xynedria bidentatus
- Xynedria bidentatus Blackburn, 1895
- Xynedria Blackburn 1894
- Xynedria interioris
- Xynedria interioris Blackburn 1894
- Xynedria interioris Blackburn, 1894
- Xyneella
- Xyneella uniformis
- Xyo (Pasalus)
- Xyo Cobb 1898
- Xyo histrix
- Xyo histrix Cobb 1898
- Xyo histrix sensu
- Xyo histrix sensu Christie 1934
- Xyo histrix sensu Cobb 1898
- Xyo pseudohistrix
- Xyo sebastianensis
- Xyo xiphacanthus
- Xyo xiphacanthus Hunt 1982
- Xyochlaena
- Xyochlaena arenaria
- Xyochlaena arenaria (Nees) Stapf
- Xyochlaena arenaria Stapf
- Xyochlaena capensis
- Xyochlaena capensis (Licht. ex Roem. & Schult.) Stapf
- Xyochlaena capensis Stapf
- Xyochlaena monachne
- Xyochlaena monachne (Trin.) Stapf
- Xyochlaena monachne (Trin.) Stapf var. minus Hack. ex Garab.
- Xyochlaena monachne minus
- Xyochlaena monachne Stapf
- Xyochlaena Stapf
- Xyochlaena Stapf in Prain 1917
- Xyochlaena Stapf in Prain, 1917
- Xyochlaena vestita
- Xyochlaena vestita (Balf. f.) Stapf
- Xyochlaena vestita Stapf
- Xypechtia rubripes
- Xypechtia rubripes Sjöstedt 1921
- Xypechtia rubripes Sjöstedt, 1921
- Xypechtia rubripes Sj�stedt 1921
- Xypechtia Sjoestedt 1921
- Xypechtia Sjostedt
- Xypechtia Sjostedt 1921
- Xypechtia sp. 1
- Xypechtia testacea
- Xypechtia testacea Sjöstedt 1921
- Xypechtia testacea Sjöstedt, 1921
- Xypechtia testacea Sj�stedt 1921
- Xypeta
- Xypeta acanthocera
- Xypeta acanthocera MacLeay 1827
- Xypeta gigas
- Xypeta gigas Aurivillius 1912
- Xypeta gigas Aurivillius, 1912
- Xypeta gigas Blackburn 1889
- Xypeta gigas Blackburn, 1889
- Xypeta gigas Hope, 1840
- Xypeta grallaria
- Xypeta grallaria Aurivillius 1912
- Xypeta grallaria Aurivillius, 1912
- Xypeta grallaria Carter 1929
- Xypeta grallaria Carter, 1929
- Xypeta grallaria Pascoe 1866
- Xypeta grallaria Pascoe, 1866
- Xypeta Pascoe 1866
- Xyraeomyia conjunctimontis
- Xyraeomyia conjunctimontis Frick
- Xyraeomyia conjunctimontis Frick 1952
- Xyraeomyia conjunctimontis Frick, 1952
- Xyraeomyia Frick 1952
- Xyrama
- Xyrama Herrmannsen 1849
- Xyrauchen
- Xyrauchen cypho
- Xyrauchen cypho Lock.
- Xyrauchen Eigenmann & Kirsch 1889
- Xyrauchen Eigenmann & Kirsch 1889 sec. Eschmeyer 1998
- Xyrauchen Eigenmann & Kirsch 1889 sec. Eschmeyer 2004
- Xyrauchen Eigenmann & Kirsch 1889 sec. Jordan & Evermann 1891
- Xyrauchen Eigenmann and Kirsch in Kirsch, 1889
- Xyrauchen Kirsch 1889
- Xyrauchen lateralis
- Xyrauchen rotundus
- Xyrauchen rotundus Sytchevskaya 1986
- Xyrauchen texamus
- Xyrauchen texanus
- Xyrauchen texanus (Abbott 1860)
- Xyrauchen texanus (Abbott 1861)
- Xyrauchen texanus (Abbott, 1860)
- Xyrauchen texanus (Abbott, 1861)
- Xyrauchen texanus x Catostomus latipinnis
- Xyrauchen uncompahgre
- Xyrauchen uncompahgre Jord. & Everm.
- Xyrauchen uncompahgre Jordan & Evermann 1891
- Xysila anticostiana
- Xysila anticostiana (Twenhofel 1914)
- Xysila astaca
- Xysila astaca Copper 1995
- Xysila Copper 1995
- Xysiomima
- Xysiophora latipennella
- Xysiophora latipennella Rebel 1937
- Xyslonotus willmanni
- Xyslonotus willmanni Herdla
- Xyslriphylloides
- Xyslriphylloides Yu Liao & Deng 1974
- Xyslriphylloides Yu, Liao & Deng 1974
- Xysma
- Xysma africana
- Xysma africana (Leclercq)
- Xysma ceanothae
- Xysma ceanothae (Viereck)
- Xysma dominicum
- Xysma dominicum Antropov 1995
- Xysma panamense
- Xysma panamense Antropov & Cambra T. 2003
- Xysma Pate 1937
- Xysmacrinus
- Xysmacrinus Ausich 1986
- Xysmacrinus greenensis
- Xysmacrinus greenensis Ausich 1986
- Xysmalobium
- Xysmalobium acerateoides
- Xytelinus Griffith and Pidgeon, 1832
- Xyticus robinsoni
- Xytopsaga
- Xytopsaga de Laubenfels 1936
- Xytopsaga myxillioides
- Xytopsaga myxillioides (Burton 1932)
- Xytopsaga myxillioides (Burton, 1932)
- Xytopsene
- Xytopsene de Laubenfels 1936
- Xytopsene fistulata
- Xytopsene fistulata (Carter 1880)
- Xytopsene fistulata (Carter, 1880)
- Xytopsene sigmata
- Xytopsene sigmata de Laubenfels 1949
- Xytopsene sigmata de Laubenfels, 1949
- Xytopsene sigmatum
- Xytopsene sigmatum de Laubenfels
- Xytopsene sigmatum de Laubenfels 1949
- Xytopseoocha
- Xytopseoocha de Laubenfels 1936
- Xytopsibis
- Xytopsibis de Laubenfels 1936
- Xytopsihis
- Xytopsihis aspera
- Xytopsihis aspera (Bowerbank 1875)
- Xytopsihis aspera (Bowerbank, 1875)
- Xytopsihis de Laubenfels 1936
- Xytopsihis Laubenfels 1936
- Xytopsiphum
- Xyzzors fitzgeraldae
- Xyzzors fitzgeraldae Inglis 1963
- Xyzzors fitzgeraldae Inglis, 1963
- Xyzzors Inglis
- Xyzzors Inglis 1963
- Xyzzors Inglis 1966
- Xyzzors Inglis, 1963
- Xyzzors inglisi
- Xyzzors inglisi Wieser & Hopper 1967
- Xyzzors inglisi Wieser and Hopper 1967
- Xyzzors inglisi Wieser and Hopper, 1967
- Xyzzors iubatus
- Xyzzors iubatus Ott 1972
- Xyzzors iubatus Ott, 1972