Lake Baikal is a rift lake in Russia. It is situated in southern Siberia, between the federal subjects of Irkutsk Oblast to the northwest and the Republic of Buryatia to the southeast. With 23,615.39 km3 (5,670 cu mi) of water, Lake Baikal is the world's largest freshwater lake by volume, containing 22–23% of the world's fresh surface water, more than all of the North American Great Lakes combined. It is also the world's deepest lake, with a maximum depth of 1,642 metres, and the world's oldest lake, at 25–30 million years. At 31,722 km2 (12,248 sq mi)—slightly larger than Belgium—Lake Baikal is the world's seventh-largest lake by surface area. It is among the world's clearest lakes.
The Abyssocottinae are a subfamily of ray-finned fishes in the family Cottidae, the sculpins. They are known commonly as the deep-water sculpins. The entire family is endemic to Lake Baikal in Siberia.
Amphipoda is an order of malacostracan crustaceans with no carapace and generally with laterally compressed bodies. Amphipods range in size from 1 to 340 millimetres and are mostly detritivores or scavengers. There are more than 9,900 amphipod species so far described. They are mostly marine animals, but are found in almost all aquatic environments. Some 1,900 species live in fresh water, and the order also includes the terrestrial sandhoppers such as Talitrus saltator and Arcitalitrus sylvaticus.
Monoporeia affinis,, is a small, yellowish benthic amphipod living in the Baltic Sea, the Arctic Sea and the lakes of the Nordic countries.
Gammaridea is one of the suborders of the order Amphipoda, comprising small, shrimp-like crustaceans. Until recently, in a traditional classification, it encompassed about 7,275 (92%) of the 7,900 species of amphipods described by then, in approximately 1,000 genera, divided among around 125 families. That concept of Gammaridea included almost all freshwater amphipods, while most of the members still were marine.
Acanthonotozomellidae is a family of amphipod crustaceans. A new species was discovered deep in Drake Passage in 2001, with small teeth covering its body. As of 2022, four genera and eight species are currently recognized.
Odiidae is a family of amphipods, sometimes included in the family Ochlesidae. It includes the following genera:
Anisogammaridae is a family of small benthic amphipods, endemic to the northern part of the Pacific rim. The family contains the following genera:
Amaryllididae is a family of marine benthic amphipods found throughout the southern hemisphere. These smooth, laterally compressed amphipods can be distinguished by the accessory setal row of the mandible having a distal tuft. It was first described in 2002 by James K. Lowry and Helen E. Stoddart. It contains the following genera:
Acanthogammaridae is a family of amphipod crustaceans, endemic to Lake Baikal. It contains the following subfamilies and genera:
Babr is a genus of amphipod crustaceans in the family Pallaseidae, endemic to Lake Baikal. There are 2 species in the genus.
Alicellidae is a family of amphipod crustaceans, which live as scavengers in the deep sea, often in association with hydrothermal vents. The family includes the following genera:
Abyssocottus is a genus of ray-finned fishes belonging to the family Cottidae, the typical sculpins. These sculpins are endemic to Lake Baikal in Russia.
Batrachocottus is a genus of freshwater ray-finned fishes belonging to the family Cottidae, the typical sculpins. These fishes are endemic to the Lake Baikal watershed in Russia.
Brandtia is a monotypic genus of amphipod in the Acanthogammaridae family, containing the species Brandtia latissima. Like other members of the family, it is endemic to Lake Baikal. This omnivore is found at depths of 1–65 m (3–213 ft) among stones. It is up to 1.9 cm (0.75 in) long.
Gammaroidea is a superfamily of crustaceans in the order Amphipoda.
Iphigenellidae is a freshwater family of amphipods in the superfamily Gammaroidea. It is found in the Ponto-Caspian region, which encompasses the Black, Azov, and Caspian Seas.
Gmelinoides is a genus of freshwater amphipod crustaceans of the family Micruropodidae.
Pallasea is a genus of Pallaseidae.
Eulimnogammaridae is a family of amphipods belonging to the order Amphipoda.
