Abyssocottidae
The Abyssocottidae are a family of fishes in the superfamily Cottoidea, the sculpins. They are known commonly as the deep-water sculpins. The entire family is endemic to Lake Baikal in Siberia.
Sculpins of this family mostly live in deep water, below. There are 24 known species in seven genera. These include, for instance, Abyssocottus korotneffi and Cottinella boulengeri which are among the deepest-living freshwater fish. Baikal is the deepest lake on Earth and sculpins occupy even its greatest depths.Molecular studies based on mitochondrial DNA suggest that the Abyssocottidae along with other Lake Baikal cottoid fishes, now attributed to the likewise endemic Cottocomephoridae and Comephoridae, together make a monophyletic group that has originated and diversified within the lake relative recently, since the Pliocene. The ancestors of this species flock comprising more than 30 species belonged to the widespread freshwater sculpin genus Cottus. The Abyssocottidae itself appears as a natural group within this radiation, except that also the genus Batrachocottus should be included.
