Abstract
Tritylodonts are an advanced cynodont group similar in morphology to early mammals, but specialized too profoundly to phytophagy to bear direct relation to the origin of Mammalia. The temporary evolutionary success of this group is supported by the fact that they were the latest cynodont group in the paleontological record, which survived the Jurassic Period. The latest genus of Tritylodontidae is Xenocretosuchus from the Lower Cretaceous of the Kemerovo oblast [1] and Krasnoyarsk krai [2]. The present study describes a new species of Xenocretosuchus from the Late Mesozoic Teete locality in the Vilyui River basin (Yakutia) [3, 4], one of the northernmost dinosaur localities of the world [5, 6]. The material examined is housed at the Paleontological Institute of the Russian Academy of Sciences, Moscow (PIN). Dental remains of the type species X. sibiricus from the Shestakovo 1 locality (Kemerovo oblast, Lower Cretaceous) are used for comparison, including the holotype and paratypes from the collection of the PIN and new undescribed material housed at the Paleontological Museum of Tomsk State University (PM TGU).
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