Stenocypris hirutai Smith and Kamiya, 2006

Ma, Shunxin & Yu, Na, 2018, Freshwater ostracods (Crustacea) from Tiantong National Forest Park and Dongqian Lake, eastern China, with descriptions of two new species, Journal of Natural History 52 (27 - 28), pp. 1825-1868 : 1851-1852

Stenocypris hirutai Smith and Kamiya, 2006

( Figures 18b,c , 19 )

Stenocypris hirutai sp. nov. Smith and Kamiya, 2006: 337–339, figs. 2(f–i), 6, 7.

Material examined

Seven females (ECNU20140914/TT14; ECNU20150421/TT53-54, 57; ECNU20150418/TT55- 56, 59) dissected.

Dimensions

(Female, n = 4) Length, 1.44–1.67 mm; height, 0.63–0.67 mm.

Brief description

Female, surface of carapace with setae along free margins. In lateral view, anterior end wider than posterior. LV overlapping RV ventrally. A2 with five short setae and one long natatory seta, five short setae equal in length, longest seta not reaching to middle of next segment. Two large bristles on third masticatory lobe of Mx1 smooth. Basal segment of L6 with two hirsute setae d, seta f reaching to end of next segment. UR asymmetrical, right one stronger than the left. UR ramus and terminal claws with well-developed denticles. Seta Sa long and seta Sp absent. UR attachment with basal triangular reinforcement.

Distribution

Stenocypris hirutai has been reported from Japan (Smith and Kamiya 2006; Tanaka et al. 2015) and South Korea ( Smith et al. 2015). This is a new report for China.

Remarks

Comparing with Japanese specimens (Smith and Kamiya 2006), the carapace of our specimens is larger and the denticles on stem of right UR are larger and longer ( Figure 19 ).

Figures

Figure 18. (a) Stenocypris derupta Vávra, 1906. Female. (a) ECNU20140913/TT65.1, external view of LV. (b, c) Stenocypris hirutai Smith and Kamiya, 2006. Female. (b) ECNU20140914/TT14, external view of LV; (c) ECNU20140914/TT14, internal view of RV. (d–g) Stenocypris viridis Okubo, 1990. Female. (d) ECNU20140909/TT26, external view of RV; (e) ECNU20140909/TT26, internal view of RV; (f) ECNU20140909/TT2601, dorsal view; (g) external view of RV. Scale bars: 100 μm.

Figure 19. UR of Stenocypris hirutai Smith and Kamiya, 2006. ECNU20140914/TT14. Female. (a) Right UR; (b) Left UR. Scale bars: 100 μm.