Xenocretosuchus

Xenocretosuchus is an extinct genus of tritylodont therapsids from the Aptian (Early Cretaceous) Ilek Formation of Siberia, in the Russian Federation.^[1] The type species, X. sibiricus, is known only from dental elements,^[2] as is X. kolossovi, described from the Batylykh Formation in 2008.^[3] Some authors have treated these species as part of the genus Stereognathus, otherwise known from the Middle Jurassic of Britain,^[4] but this is rejected by other authors.^[5]

Xenocretosuchus Temporal range: Aptian, 136.4–125.45 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Clade:	Therapsida
Clade:	Cynodontia
Family:	†Tritylodontidae
Genus:	†Xenocretosuchus Tatarinov & Matchenko, 1999
Type species
Xenocretosuchus sibiricus Tatarinov & Matchenko, 1999
Other species
X. kolossovi Lopatin & Agadjanian, 2008

Alongside Montirictus and Fossiomanus, it is amongst the latest known non-mammaliform synapsids, extending their range to the Early Cretaceous.