Abyssocottus boulengeri Berg, 1906

Sideleva, Valentina G. & Zhidkov, Zakhar V., 2021, An annotated type catalogue of freshwater sculpins (Cottoidei) described by Lev Berg, Zootaxa 5016 (2), pp. 229-242 : 231

Abyssocottus boulengeri Berg, 1906

( Fig. 2 )

Holotype: ZIN 13736, Lake Baikal , opposite Cape Boroelgai (3 versts from the coast), depth 1080 m, August 2, 1902, collected by A.A. Korotneff.

Current status: Cottinella boulengeri ( Berg, 1906) ( Taliev, 1955; Sideleva, 1982, 2003).

Counts: D1 6, D2 14, A 12, P 18, C 23, vert. 33 (abdominal 10, caudal 23), two-pairs of pleural ribs.

Diagnosis: the head is rounded in front, behind the head the body rises up and expands from the sides; small round eye, wide interorbital space, two times the diameter of the eye; well-developed four spines on the preoperculum; anterior nostrils in the form of long tubes directed to the sides.

Proportional measurements as percentages of standard length (97.4 mm): predorsal length 40.6, preanal length 61.0, maximum body depth 21.9, length of caudal peduncle 17.7, depth of caudal peduncle 5.9, length of first dorsal-fin base 12.5, length of second dorsal-fin base 25.5, length of anal-fin base 23.0, length of longest first dorsalfin ray 4.6, length of longest second dorsal-fin ray 11.5, length of longest anal-fin ray 10.4, pectoral-fin length 25.0, pelvic-fin length 17.2, distance between first and second dorsal fins 5.7, head length 33.3, postorbital length 19.8, head depth 19.8, head width 32.3, eye horizontal diameter 4.7, interorbital width 9.4, upper jaw length 15.3, snout length 10.0, interbranchial width 3.0, length of gill slit 23.0.

Figures

FIGURE 2. Abyssocottus boulengeri Berg, 1906 ZIN 13736, holotype, photo (A) and radiograph (B).