Otodus sokolovi

Otodus sokolovi; Temporal range: Lutetian-Rupelian 47–28 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Otodus sokolovi tooth from Dakhla, Western Sahara
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Order:	Lamniformes
Family:	†Otodontidae
Genus:	†Otodus
Species:	†O. sokolovi
Binomial name
	†Otodus sokolovi; Jaekel, 1895
Subspecies
	†O. s. caspiensis (Zhelezko in Zhelezko & Kozlov, 1999); †O. s. sokolovi? (Zhelezko in Zhelezko & Kozlov, 1999);
Synonyms
	Carcharocles sokolovi Carcharocles sokolowi Jaekel, 1895 (sic);

Otodus sokolovi^[2] is an extinct species or chronospecies of large shark in the family Otodontidae which may represent a transitional chronospecies between Otodus auriculatus and Otodus angustidens.^[3] They differ from the former with a less curved root and finer serrations and from the latter with more prominent and recurved cusps. Due to the subtle differences, it is sometimes lumped into O. auriculatus. It, along with the rest of Otodus, is sometimes placed in the genus Carcharocles. Due to its similarities with other chronospecies, it is difficult to tell exactly when it arose and went extinct. Generally, it is said to span from the late Eocene to early Oligocene. They are best known from the late Eocene localities around Dakhla, Morocco and Fayum, Egypt but are represented in many deposits of contemporary age.^[4] It measured at least 6 metres (20 ft) long.^[3]

References

^ Cajus G. Diedrich (2012). "Eocene (Lutetian) Shark-Rich Coastal Paleoenvironments of the Southern North Sea Basin in Europe: Biodiversity of the Marine Fürstenau Formation Including Early White and Megatooth Sharks". International Journal of Oceanography. 2012 (1): 1–22. doi:10.1155/2012/565326.
^ Shimada, K.; Chandler, R. E.; Lam, O. L. T.; Tanaka, T.; Ward, D. J. (2016). "A new elusive otodontid shark (Lamniformes: Otodontidae) from the lower Miocene, and comments on the taxonomy of otodontid genera, including the 'megatoothed' clade". Historical Biology. 29 (5): 1–11. doi:10.1080/08912963.2016.1236795. S2CID 89080495.
^ ^a ^b Trif, N.; Ciobanu, R.; Vlad, C.A. (2016). "The first record of the giant shark Otodus megalodon (Agassiz, 1835) from Romania". Brukenthal. Acta Musei. 11 (3): 507–526.
^ Kriwet, Jürgen; Engelbrecht, Andrea; Mörs, Thomas; Reguero, Marcelo; Pfaff, Cathrin (2016). "Ultimate Eocene (Priabonian) Chondrichthyans (Holocephali, Elasmobranchii) of Antarctica". Journal of Vertebrate Paleontology. 36 (4): e1160911. Bibcode:2016JVPal..36E0911K. doi:10.1080/02724634.2016.1160911. ISSN 0272-4634. PMC 5346486. PMID 28298806.

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[Diedrich2012-1] Cajus G. Diedrich (2012). "Eocene (Lutetian) Shark-Rich Coastal Paleoenvironments of the Southern North Sea Basin in Europe: Biodiversity of the Marine Fürstenau Formation Including Early White and Megatooth Sharks". International Journal of Oceanography. 2012 (1): 1–22. doi:10.1155/2012/565326.

[Shimada2016-2] Shimada, K.; Chandler, R. E.; Lam, O. L. T.; Tanaka, T.; Ward, D. J. (2016). "A new elusive otodontid shark (Lamniformes: Otodontidae) from the lower Miocene, and comments on the taxonomy of otodontid genera, including the 'megatoothed' clade". Historical Biology. 29 (5): 1–11. doi:10.1080/08912963.2016.1236795. S2CID 89080495.

[TCV2016-3] Trif, N.; Ciobanu, R.; Vlad, C.A. (2016). "The first record of the giant shark Otodus megalodon (Agassiz, 1835) from Romania". Brukenthal. Acta Musei. 11 (3): 507–526.

[4] Kriwet, Jürgen; Engelbrecht, Andrea; Mörs, Thomas; Reguero, Marcelo; Pfaff, Cathrin (2016). "Ultimate Eocene (Priabonian) Chondrichthyans (Holocephali, Elasmobranchii) of Antarctica". Journal of Vertebrate Paleontology. 36 (4): e1160911. Bibcode:2016JVPal..36E0911K. doi:10.1080/02724634.2016.1160911. ISSN 0272-4634. PMC 5346486. PMID 28298806.

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