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Hyposaurus
''Hyposaurus'' is a genus of extinct marine dyrosaurid crocodyliform. Fossils have been found in Paleocene aged rocks of the Maria Farinha Formation in Pernambuco, Brazil, Iullemmeden Basin in West Africa, and Maastrichtian (Late Cretaceous) through Danian (Early Paleocene) strata in New Jersey, Alabama and South Carolina. Isolated teeth comparable to ''Hyposaurus'' have also been found in Thanetian (Late Paleocene) strata of Virginia.〔Denton Jr., R. K., Dobie, J. L. and D. C. Parris, 1997. The Marine Crocodilian ''Hyposaurus'' in North America. from Ancient Marine Reptiles, editors J. M. Callaway and E. L. Nicholls, Academic Press.〕 It was related to ''Dyrosaurus'', and is the only dyrosaurid known from the western hemisphere.
The priority of the species ''H. rogersii'' has been debated,〔Parris, D. C. 1986, Biostratigraphy of the fossil crocodile ''Hyposaurus'' Owen from New Jersey. Investigations of the New Jersey State Museum 4:1-16〕〔Norell, M. A. and G. W. Storrs. 1989. Catalogue and review of the type fossil crocodilians in the Yale Peabody Museum. Postilla 203:1-28〕 however there is no sound basis for the recognition of more than one species from North America. The other North American species (i.e. ''H. fraterculus'', ''H. ferox'' and ''H. natator'') are therefore considered ''nomina vanum'' (i.e. empty names).〔
==References==
category:Prehistoric reptiles of South America
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