in 2001 was also tentatively ascribed to a juvenile specimen of Anteosaurus. However, the complete preparation of this skull, made later, revealed that it belonged to a tapinocephalid dinocephalian. The Middle Permian Abrahamskraal Formation is biostratigraphically subdivided in two faunal zone : the Eodicynodon Assemblage Zone which is the oldest one with an essentially Wordian age, and the Tapinocephalus Assemblage Zone, which is mainly Capitanian in age. Anteosaurus belongs to the Tapinocephalus Assemblage Zone which is characterized by the abundance and the diversification of the dinocephalians therapsids. Since 2020, this zone is divided into two subzones : a lower Eosimops - Glanosuchus subzone and an upper Diictodon - Styracocephalus subzone, both of which contain Anteosaurus fossils. Like all other South African dinocephalians, Anteosaurus was presumed extinct at the top of the Abrahamskraal Formation. However, remains of Anteosaurus and two other dinocephalian genera (Titanosuchus and Criocephalosaurus) have been found in the basal portion of the Poortjie Member of the overlying Teekloof Formation. These discoveries greatly expanded both the stratigraphic range of these three dinocephalian genera and the upper limit of the Tapinocephalus Assemblage Zone that reaches the base of the Teekloof Formation. In the latter, the remains of these three dinocephalians were found in an interval of above a level dated to 260.259 ± 0.081 million years ago, representing the Upper Capitanian. Other radiometric dating have constrained the base of the Tapinocephalus Assemblage Zone (Leeuvlei Member in the middle part of the Abrahamskraal Formation) to be older than 264.382 ± 0.073 Ma and placed the boundary between the two subzones at 262.03 ± 0.15 Ma. The upper part of the Abrahamskraal Formation (top of the Karelskraal Member) gave an age of 260.226 ± 0.069 Ma which is consistent with the age of 260.259 ± 0.081 of the base of the Teekloof Formation. These datings show that the age of the Tapinocephalus Assemblage Zone extends from Late Wordian to Late Capitanian (based on Guadalupian radiometric ages obtained in 2020 from the type locality of the Guadalupe Mountains in west Texas). Russia ? The genus Anteosaurus is possibly present in Russia based on a fragmentary cranial remain found in the 19th century in the Republic of Tatarstan (Alexeyevsky District). This specimen, firstly interpreted as a snout boss of a dicynodont (named Oudenodon rugosus), was later correctly identified by Ivan Efremov as an angular boss of an anteosaurid. The shape of this boss clearly