Illaenidae

Illaenidae; Temporal range: Ordovician–Silurian PreꞒ Ꞓ O S D C P T J K Pg N
	Illaenus sarsi, 25mm
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Trilobita
Order:	†Corynexochida
Family:	†Illaenidae; Hawle and Corda, 1847

The Illaenidae are a family of trilobites in the order Corynexochida. 223 currently accepted species in 24 genera are known from the Ordovician. Some scholars include the Panderiidae in the Illaenidae, but this is not generally supported.^[2]

Distribution

Illaenus? priscus from Salair and Illaenus? berkutensis from the Malyi Karatau, Kazakhstan (both Lower Tremadocian), are both very poorly known and it remains uncertain to which family they could best be assigned. The first certain Illaenid is I. hinomotoensis from the Upper Tremadocian of North China and South Korea. The earliest species known from Laurentia (western Ireland) is I. weaveri, probably latest Floian. These early occurrences are from the tropics, but during the Darriwilian the family spread over southern Gondwana, and became cosmopolitan for the remainder of the Ordovician, although most genera had limited distributions. The genus Stenopareia survived the Ordovician–Silurian extinction events and the family slightly rebounded with 26 species divided over three genera during the Silurian. Quadratillaenus tewoensis from North China is the youngest species known (Pridoli Epoch).^[2]

Genera

Bumastoides Whittington 1954
Cryptonymus Eichwald 1825
Deucalion Shtsheglov 1827
Dysplanus Burmeister 1843
Ectillaenus Salter 1867
Harpillaenus Whittington 1963
Hyboaspis Raymond 1920
Hydrolaenus Salter 1867
Illaenus Dalman 1827
Nanillaenus Jaanusson 1954
Octillaenus Salter 1867
Parillaenus Jaanusson 1954
Platillaenus Jaanusson 1954
Ptilillaenus Lu 1962
Rhodope Angelin 1854
Stenopareia Holm 1886
Thaleops Conrad 1843
Ulugtella Petrunina 1975
Zbirovia Snajdr 1956
Zdicella Snajdr 1956
Zetillaenus Snajdr 1957

^[1]

References

^ ^a ^b "The Paleobiology Database". Archived from the original on 2022-03-25. Retrieved 2021-12-17.
^ ^a ^b D.A.T. Harper; T. Servais, eds. (2014). Early Palaeozoic Biogeography and Palaeogeography. Memoirs of the Geological Society of London. Vol. 38. Geological Society of London. p. 490. ISBN 978-1862393738.

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[fa-1] "The Paleobiology Database". Archived from the original on 2022-03-25. Retrieved 2021-12-17.

[HarperServais-2] D.A.T. Harper; T. Servais, eds. (2014). Early Palaeozoic Biogeography and Palaeogeography. Memoirs of the Geological Society of London. Vol. 38. Geological Society of London. p. 490. ISBN 978-1862393738.

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