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They evolved during the Late Jurassic but were not very common until the Cretaceous period
with anoxic conditions
Dyrosaurus is a genus of extinct crocodylomorph that lived from the upper Cretaceous to the Eocene period
Gerastos sp: Fossilworks (Paleobiology Database)
06432 - Great Collection of 3 Ginglymostoma sp Nurse Shark Teeth Paleocene Dinosaurs They evolved during the LateGinglymostoma sp, Mller and Henle 1838 (nurse shark) Chondrichthyes Orectolobiformes Ginglymostomatidae Synonym: Acrodobatis Leidy 1877 (taxon 124936) Parent taxon: Ginglymostomatidae according to R. Tabuce et al. 2005 See also Case and Schwimmer 1988, Jordan 1963, Leriche 1942, Purdy et al. 2001, Sepkoski 2002, Thurmond and Jones 1981, White 1926 and Woodward 1889 Sister taxa: Cantioscyllium, Nebrius, Plicatoscyllium, Protoginglymostoma Subtaxa: