Kotlassia is an extinct genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of Reptiliomorpha

Reptiliomorpha

Reptiliomorpha refers to an order or subclass of reptile-like amphibians, which gave rise to the amniotes in the Carboniferous. Under phylogenetic nomenclature, the Reptiliomorpha includes their amniote descendants though, even in phylogenetic nomenclature, the name is mostly used when referring to...

. Fossils of it are found in Russia, in the village of Novinki, close to the city of Kotlas

Kotlas

Kotlas is a town in the southeast of Arkhangelsk Oblast, Russia, situated at the confluence of the Northern Dvina and Vychegda Rivers. Administratively, it is incorporated as a town of oblast significance . It also serves as the administrative center of Kotlassky District, by which it is...

. The name of the genus is derived from the city. The layers in which the fossils were found date from the Late Permian

Permian

The PermianThe term "Permian" was introduced into geology in 1841 by Sir Sir R. I. Murchison, president of the Geological Society of London, who identified typical strata in extensive Russian explorations undertaken with Edouard de Verneuil; Murchison asserted in 1841 that he named his "Permian...

. Along with many other animals Kotlassia died out at the end of the Permian in the Permian–Triassic extinction event that marked the border between the Permian and Triassic

Triassic

The Triassic is a geologic period and system that extends from about 250 to 200 Mya . As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic. Both the start and end of the Triassic are marked by major extinction events...

periods.