Xenocretosuchus

Xenocretosuchus is an extinct genus of tritylodont therapsids from the Aptian (Early Cretaceous) Ilek Formation of Siberia, in the Russian Federation. The type species, "X. sibiricus", is known only from dental elements, as is "X. kolossovi", described from the Batylykh Formation in 2008. Both species may be part of the genus "Stereognathus".
Alongside "Montirictus", it is the latest known non-mammalian synapsid (excepting the perhaps also not-mammalian haramiyidan "Avashishta"), extending their range to the Early Cretaceous.