TL;DR: In this paper, the Permian and Triassic chroniosuchians are revised and the morphology of the dorsal armor scutes is discussed in detail, and the first narrow-armored chronosuchid Uralerpeton tverdochlebovae is described.
Abstract: The Permian and Triassic chroniosuchians are revised and the morphology of the dorsal armor scutes is discussed in detail. The first narrow-armored chroniosuchid Uralerpeton tverdochlebovae from the Late Permian Vyazniki faunistic assemblage of Eastern Europe is described and the age of the Vyazniki fauna discussed.