Babr nigromaculatus (Dorogostaisky, 1922)

(Figures 8−10)

Pallasea baikali nigromaculata Dorogostaisky, 1922: 125, Tab. 2, Fig. 5; Pallasea baikali (partim) Stebbing, 1906: 378;

Pallasea (Pallasea) baikali nigromaculata Bazikalova, 1945: 146; Barnard & Barnard, 1983: 480; P. baikali Väinölä & Kamaltynov, 1999: 951 [“ P.baikali S”];

P. (Pallasea) baikali nigromaculata Takhteev, 2000: 60;

Babr nigromaculatus Kamaltynov, 2002: 757 .

Type specimens. Lectotype, female, 21 mm, “fabrika Sibiryakova, 19-VII- 15 g, glubina 20 mt, draga, V. Dorogostaisky” (ZIN, 1/88438). Paralectotypes: 3 females, 21 mm, “fabrika Sibiryakova, 19-VII- 15 g, glubina 20 mt, draga, V. Dorogostaisky” (ZIN, 1/50202); 1 female, 21 mm, “det. V. Dorogostaisky” (LIN, 865).

Additional material examined. Kultuk (S, 51°43´N, 103°43´E), 15 m, sand, 16.06.1915, coll. Dorogostaisky (mor: 1 ZIN 1/88438);

Kultuk (S), 51°43´N, 103°43´E, 4−14 m, sand, 28.09.1997 coll. RMK & RV (mor: 1; all: 6; mtD: 1);

Kultuk (S), 51°43´N, 103°43´E, 5−10m, sand, 14.09.1998, coll. RV (all: 1; mtD: 1);

Sennaya Bay (S), 52°16´19´´ N, 105°43´40´´ E, 16−17 m, 0 5.2006, coll. J. Smith (mor: 7 MZH 53159, 53172; mtD: 3);

Peschanaya Bay (S), 52°15´N, 105°42´E (st. 91-1), 7−10 m, 14.08.1991 coll. RMK & RV (all: 8; mtD: 1);

Baikal (S/C), 8.1991 coll. RMK & RV (mor: 1 MZH 53164);

Cape Telegrafny (S, 51°35´N, 103°56´E), coll. Botkin (mor: 1 ZIN 4/88442);

Cape Ulan-Koblit (unknown locality), 18 m, mud, algae, 31.07.1916 coll. Bazikalova (mor: 1 ZIN 5/ 88444);

Olkhon Strait (C/N), 53°00´N, 106°53´E (st. 91-2), 30−35 m, 17.08.1991 coll. RMK & RV (all: 1);

Olkhon Strait (C/N), 53°00´N, 106°53´E (st. 99-65), 20 m, 28.7.1999, coll. RMK & RV (mtD: 2);

Olkhon Strait (C/N), 53°02´N, 106°53´E (st. 09-52), Kurkut Bay, 7.5-11.4 m, 0 3.07.2009, coll. MED, RV, Zagibalova (mor: 1 MZH 53171; mtD: 1)

Uzury (Olkhon Island; C), 53°21´52´´ N, 107°46´20´´ E (st. 07-17), 16 m, sand, 0 7.08.2007, coll. MED & RV (mor: 9 MZH 53167; mtD: 3);

Kocherikova (N), 53°43´N, 107°49´E (st. 07-23), 20 m, sand, 0 8.08.2007, coll. MED & RV, divers (mor: 1 MZH 53169; mtD: 1);

Davsha Bay (N), 54°21´40´´ N, 109°28´15´´ E (st. 07-31), 10 m, sand, 0 9.08.2007, coll. MED & RV (mor: 2 MZH 53168; mtD: 2);

Tukkaralagda Cape (N, 55°26´N, 109°49´E), st. 1351, 5 m, coarse sand, 15.07.1959, coll. Bazikalova (mor: 1 LIN 866);

1 km S from mouth of Malaya Cheremshana River (N), 54°00´N, 109°24´E (st. 99-39), 15–25 m, 25.7.1999, coll. RMK & RV (mor:1; mtD: 2);

Turka (C), 52°56´N, 108°12´E (st. 07-53), 10 m, sand, 12.08.2007, coll. RV & MED (mor: 7 MZH 53166; mtD: 5);

Gremyachinsk (C), 52°40´N, 107°58´E (st. 00-43), 14–16 m, sand, 27.09.2000, coll. RMK & RV (mor: 1 MZH 53163; mtD: 3);

Manturikha (S, 51°56´N, 105°46´E), st. 610, N2941, 21.08.1925, coll. Bazikalova (mor: 1 ZIN 3/88441).

Type locality. Lake Baikal, Sennaya Bay near Bolshie Koty, where Sibiryakov’s factory was situated, 51°53´N, 105°04´E (see Drizhenko, 1908); specified here.

Diagnosis. Marginal prominences of head shorter than marginal prominences of pereonites, blunt (Fig. 9 b). Uronite 1 with dorso-lateral spine-setae (Fig. 9 c). Antenna 1 equal to or longer than half of body length (0.5−0.6 times body length) (Fig. 9 a). Antenna 1 peduncle segment 1 slightly shorter than segment 2. Antenna 2 peduncle segment 4 slightly shorter than segment 5 (Fig. 9 a). Mandibular palp segment 1 with one–three ventral setae; segment 3 with 24 to 45 short ventral spine-setae. Coxa 4 with convex distal margin (Fig. 9 a). Posterior margin of pereopod 6 basis clearly concave (Fig. 10 c). Uropod 3 about as long as urosome (Fig. 9 c). Uropod 3 rami subequal in length (Fig. 10 f).

Color greenish-yellowish, with dark-orange or brown spots. Pereonites 1−3 with wide dorso-lateral spots. Pereonites 4 and 5 without dorso-lateral spots. (Fig. 8 a, b).

Body length of adult individuals 21−36 mm.

Description of lectotype. Fitting the specific and generic diagnoses above, with following specifications. Marginal prominences of pereonites 1−5 blunt and hooked. Uronite 1 with two and three, uronite 2 and 3 with two dorso-lateral spine-setae on each side. Antenna 1 longer than half of body length (0.6 times body length). Antenna 1 peduncle segment 2 slightly longer than segments 1 and 3. Antenna 1 flagellum with 22 subsegments. Mandibular palp segment 1 with one ventral seta; segment 2 about as long as segment 3; segment 3 with 24 short ventral spine-setae. Uropod 3 exopod 1.1 times as long as endopod.

DNA. Mitochondrial DNA lineage typified by the sequence of a fragment of the COI gene deposited in GenBank with accession no GQ919202 (from a specimen from Sennaya Bay, MZH 53172), from which conspecific specimens may differ at up to 2.8 % of nucleotide sites, whereas any heterospecific individuals at least 15 %.

Allozymes. Distinguished from B. baikali by having electrophoretically slower allozymes of the enzymes ENO, MDH-1 and PGD, and electrophoretically faster ones of AAT-2, AP, ARK, IDH-1, IDH-2, MDH-2 and PGM (Table 1).

Distribution and habitat. Throughout the coasts of Baikal (Fig. 1 b), on sandy bottoms at 5−35 m depth, typically deeper than 10 m.