Onchosaurus

Onchosaurus; Temporal range: Late Cretaceous, 84.9–66.043 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Fossil vertebrae of Onchosaurus marocanus from Khouribga (Morocco)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Order:	Rajiformes
Family:	†Sclerorhynchidae
Genus:	†Onchosaurus; Gervais, 1852
Type species
	†Onchosaurus radicalis; Gervais, 1852
Species
	†O. marocanus Arambourg, 1935; †O. pharao (Dames, 1887) ; †O. radicalis Gervais. 1852 (type species);
Synonyms
	Gigantichthys? Dames, 1887; Onchosaurus maroccanus Arambourg, 1935 (sic); Titanichtys pharao Dames, 1887; Ischyrhiza iwakiensis Uyeno & Hasegawa, 1986; Onchosaurus iwakiensis Suárez & Cappetta, 2004; Onchopristis pharao Martill & Ibrahim, 2012;

Onchosaurus is an extinct genus of sclerorhynchid sawskate from the Late Cretaceous (84.9 to 66.043 million years ago). Its fossils have been found in the Cretaceous sediments of Egypt, Brazil, Congo, Morocco, France, Niger, Japan, Colombia, Chile,^[1] Peru and the United States.^[2]

Description

These sclerorhynchid sawskates are only known by isolated vertebra and rostral spines. On the basis of fossil findings they are considered large, bottom-dwelling fishes, mainly inhabiting shallow marine habitats, but they were also powerful swimmers.^[3]

Species

Species within this genus include:^[2]^[4]^[5]

Onchosaurus marocanus Arambourg, 1935
Onchosaurus pharao (Dames, 1887)
Onchosaurus radicalis Gervais, 1852

References

^ Suárez, M. E.; Cappetta, H. (2004). "Sclerorhynchid teeth (Neoselachii, Sclerorhynchidae) from the Late Cretaceous of the Quiriquina Formation, central Chile". Revista Geológica de Chile. 31 (1): 89–103. doi:10.4067/S0716-02082004000100005.
^ ^a ^b Fossilworks
^ Kriwet, J.; Klug, S. (2012). "Presence of the extinct sawfish, Onchosaurus (Neoselachii, Sclerorhynchiformes) in the Late Cretaceous of Peru with a review of the genus". Journal of South American Earth Sciences. 39: 52–58. doi:10.1016/j.jsames.2012.06.007.
^ ARAMBOURG, C. (1935) Note préliminaire sur les vertébrés fossiles des phosphates du Maroc. Bulletin de la Société géologique de France, 5 (5): 413–439, 2 fig., 2 pl.
^ George S. Williams A Listing of Fossil Sharks and Rays of the World

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[1] Suárez, M. E.; Cappetta, H. (2004). "Sclerorhynchid teeth (Neoselachii, Sclerorhynchidae) from the Late Cretaceous of the Quiriquina Formation, central Chile". Revista Geológica de Chile. 31 (1): 89–103. doi:10.4067/S0716-02082004000100005.

[aa-2] Fossilworks

[Kriwet-3] Kriwet, J.; Klug, S. (2012). "Presence of the extinct sawfish, Onchosaurus (Neoselachii, Sclerorhynchiformes) in the Late Cretaceous of Peru with a review of the genus". Journal of South American Earth Sciences. 39: 52–58. doi:10.1016/j.jsames.2012.06.007.

[4] ARAMBOURG, C. (1935) Note préliminaire sur les vertébrés fossiles des phosphates du Maroc. Bulletin de la Société géologique de France, 5 (5): 413–439, 2 fig., 2 pl.

[5] George S. Williams A Listing of Fossil Sharks and Rays of the World

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