Thoracosaurus

Thoracosaurus is an extinct genus of eusuchian crocodylomorph which existed during the Late Cretaceous and early Paleocene. The animal is usually regarded as a gavialoid crocodilian,[1] though the phylogenetic study published by Lee & Yates (2018) suggests that it might have been a non-crocodylian eusuchian.[2] The genus contains the species Thoracosaurus neocesariensis in North America[3] and what is either Thoracosaurus isorhynchus or T. macrorhynchus; a recent review [4] argues that T. macrorhynchus is a junior synonym of T. isorhynchus, but it is unclear whether the type of T. isorhynchus allows differentiation of European and North American Thoracosaurus; if not, then T. isorhynchus would be a nomen dubium. A number of species have been referred to this genus, but most are dubious.[1]

Thoracosaurus Temporal range: Late Cretaceous–Early Paleocene PreꞒ Ꞓ O S D C P T J K Pg N
Thoracosaurus isorhynchus skull
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Crocodilia
Superfamily:	Gavialoidea
Genus:	†Thoracosaurus Leidy, 1852
Species
†T. neocesariensis (de Kay, 1842 [originally Gavialis neocesariensis]) (type) †T. isorhynchus (Pomel, 1847) †T. scanicus

Thoracosaurus scanicus was a fairly large gavialoid, with a length of more than 4.4 m (14.4 ft) and a 55 cm skull.[5]

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  Thoracosaurus sp. teeth at the Geological Museum, Copenhagen