Chthonosaurus

Chthonosaurus is an extinct genus of eutherocephalian^[1] therapsids from the Late Permian Kutulukskaya Formation of Russia. The type species Chthonosaurus velocidens was named in 1955.^[2]

Chthonosaurus Temporal range: Late Permian ~260–253 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Life restoration of Chthonosaurus velocidens
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Clade:	Therapsida
Clade:	†Therocephalia
Clade:	†Eutherocephalia
Genus:	†Chthonosaurus Vjuschkov 1955
Type species
†Chthonosaurus velocidens Vjuschkov 1955