Baicalocandona rupestris disona (Mazepova, 1990) Mazepova, 1990

Karanovic, Ivana & Sitnikova, Tatiana Ya., 2017, Morphological and molecular diversity of Lake Baikal candonid ostracods, with description of a new genus, ZooKeys 684, pp. 19-56 : 30-33

Baicalocandona rupestris disona (Mazepova, 1990) comb. n. Figs 12, 13, 14A, 15A

Candona rupestris dissona subsp. n. - Mazepova (1990): p. 152, fig. 56B, 57B.

Material examined.

Soft parts of one male and one female used for DNA extraction, after that each dissected and mounted onto one glass slides, their shells kept on one SEM stub each, 40 juveniles kept in 95% alcohol, all collected from 12-15 m depth by SCUBA diving off Listvyanka, 51°51'51.3"N, 104°50'37.8"E, 12 September 2015, collectors: Igor Khanaev and Ivan Nebesnykh.

Short redescription.

Almost no sexual dimorphism in shell shape in lateral view (Fig. 12 A–D). Both LV and RV trapezoidal, dorsal margin straight in middle and rounded /inclined towards anterior and posterior ends. Posterior and anterior ends narrower and anterior slightly wider than posterior end. Surface mostly smooth and ornamented with few shallow pits only centrally. Surface cuticular pores simple, without prominent lip. Surface sensory setae long (Fig. 12E, F). Length around 0.7 mm.

A1 7-segmented (Fig. 13A). Male A2 with subdivided penultimate segment and t2- and t3-setae transformed into sexual bristles; only z2-setae transformed into claws, z1, and z3-seta untransformed; G1- and G3-claws reduced and short, G2-claw long (Fig. 13B). Female A2 (Fig. 13M) with all three untransformed z-seta; G2 claw as long as all other claws. Md-palp (Fig. 13D) with 4+2 setae on inner side, gamma seta not plumose. Mxl-palp (Fig. 14C) with rectangular terminal segment. Prehensile palps (Fig. 13E, G) stocky, right one with very strong finger but not hook-like. L6 (Fig. 13H) with short basal seta. L7 (Fig. 13I) 4-segmented; basal segment with d1- and dp-setae; no e- or f-setae, g-seta long; terminal segment with setae h2- and h3- long and h1-seta shorter. UR in both sexes (Figs 13J, K) very similar, thin, and curved, with short posterior seta and thin, subequal claws. Hemipenis (Figs 13L, 14A) with large a-lobe but not laterally projecting, M-peace distally clearly foot-like, ejaculatory tube with large, finger-like distal end and with ornamented lateral plate. Female genital field (Fig. 13K) rounded. Zenker organ with 4+2 whorls of spines (Fig. 15A); anterior cap with thin margins and with long spine-like projections, and lattice not so well-pronounced. Eyes dark.