''Kotlassia'' is an extinct

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...

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

Kotlas Kotlas (russian: Ко́тлас) is a town in Arkhangelsk Oblast, Russia, located at the confluence of the Northern Dvina and Vychegda Rivers. Population: Kotlas is the third largest town of Arkhangelsk Oblast in terms of population (after ...

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

Late Permian Late may refer to: * LATE, an acronym which could stand for: ** Limbic-predominant age-related TDP-43 encephalopathy, a proposed form of dementia ** Local-authority trading enterprise, a New Zealand business law ** Local average treatment effect, ...

.Palmer D. 2009, p. 154 Along with many other animals ''Kotlassia'' died out at the end of the Permian in the

Permian–Triassic extinction event The Permian–Triassic (P–T, P–Tr) extinction event, also known as the Latest Permian extinction event, the End-Permian Extinction and colloquially as the Great Dying, formed the boundary between the Permian and Triassic geologic periods, a ...

that marked the border between the Permian and

Triassic The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago (Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period ...

periods.

References

Seymouriamorphs Permian tetrapods Fossils of Russia {{paleo-amphibian-stub