Abstract
New materials from terminal Permian localities of the Vyazniki Faunal Assemblage from the eastern Vladimir Region, including a tooth of the proterosuchid Archosaurus rossicus Tatarinov, 1960, which is recorded for the first time in a coprolite, are described. New data on tetrapod coprolites allow a more reliable reconstruction of trophic relationships and reorganization of the trophic structure of this terrestrial community. Interactions of the higher-rank consumers therocephals and early proterosuchid archosaurs were not restricted to competition for food resources, but also included preying of adult representatives of one taxon on juveniles of the other.
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