Belongs within: Cottoidea.
The Abyssocottidae is a group of sculpins endemic to Lake Baikal, many of which live in deep water and exhibit associated adaptations such as reduced scalation and a lateral line of exposed neuromasts.
See also: The sculpins of Baikal.
Abyssocottidae [Cottocomephoridae, Cottocomephorinae]
|--+--Leocottus kesslerii [=Cottus kesslerii] KKV03
| `--Cottocomephorus KKV03
| |--C. alexandrae KKV03
| |--C. grewingkii KKV03
| `--C. inermis KKV03
|--+--Paracottus knerii KKV03
| `--Procottus KKV03
| |--P. gotoi KKV03
| |--P. gurwici KKV03
| |--P. jeittelesii KKV03
| `--P. major KKV03
`--+--Comephorus Lacepède 1800 KKV03, B78 [=Comophorus Agassiz 1846 B78; Comephoridae]
| |--C. baicalensis KKV03
| `--C. dybowski KKV03
`--Abyssocottinae KKV03
| i. s.: Neocottus KKV03
| |--N. thermalis KKV03
| `--N. werestschagini KKV03
|--Cyphocottus KKV03
| |--C. eurystomus KKV03
| `--C. megalops KKV03
`--+--+--‘Abyssocottus’ gibbosus KKV03
| `--+--Batrachocottus KKV03
| | |--B. baicalensis KKV03
| | |--B. multiradiatus KKV03
| | |--B. nikolskii KKV03
| | `--B. talievi KKV03
| `--Limnocottus KKV03
| |--+--L. bergianus KKV03
| | `--L. pallidus KKV03
| `--+--L. godlewskii KKV03
| `--L. griseus KKV03
`--+--+--Cottinella boulengeri KKV03
| `--Abyssocottus KKV03
| |--A. elochini KKV03
| `--A. korotneffi KKV03
`--Asprocottus KKV03
| i. s.: A. abyssalis KKV03
| A. parmiferus KKV03
|--+--A. herzensteini KKV03
| `--A. platycephalus KKV03
`--+--A. korjakovi KKV03
| |--A. k. korjakovi KKV03
| `--A. k. minor KKV03
`--A. pulcher KKV03
*Type species of generic name indicated
REFERENCES
[B78] Britton, E. B. 1978. A revision of the Australian chafers (Coleoptera: Scarabaeidae: Melolonthinae) vol. 2. Tribe Melolonthini. Australian Journal of Zoology, Supplementary Series 60: 1–150.
[KKV03] Kontula, T., S. V. Kirilchik & R. Väinölä. 2003. Endemic diversification of the monophyletic cottoid fish species flock in Lake Baikal explored with mtDNA sequencing. Molecular Phylogenetics and Evolution 27: 143–155.