Chroniosaurus

Chroniosaurus is an extinct genus of chroniosuchid stegocephalian, often considered a reptiliomorph^[1] but possibly a stem-tetrapod,^[2] from upper Permian (upper Tatarian age) deposits of Novgorod, Orenburg and Vologda Regions, Russia.^[3] It was first named by Tverdokhlebova in 1972 and the type species is Chroniosaurus dongusensis.^[3]

Chroniosaurus Temporal range: 255 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ Upper Permian
C. dongusensis
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Reptiliomorpha (?)
Order:	†Chroniosuchia
Family:	†Chroniosuchidae
Genus:	†Chroniosaurus Tverdochlebova, 1972
Species
†C. dongusensis Tverdokhlebova, 1972 (type) †C. levis Golubev, 1998

Restoration of C. dongusensis

Its lifestyle is uncertain. An early study suggested a fairly aquatic lifestyle,^[4] but its femoral microanatomy^[5] and dorsal dermal plates^[6] suggest a rather terrestrial lifestyle.