ILYOCYPRIDIDAE Kaufmann

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 : 1855-1857

Family ILYOCYPRIDIDAE Kaufmann

Subfamily ILYOCYPRIDINAE Kaufmann

Genus Ilyocypris Brady and Norman

Ilyocypris angulata Sars, 1903

( Figure 22a–d )

Ilyocypris angulata sp. nov. Sars, 1903: 38, fig. 8(a–c).

Material examined

Two females (ECNU20150420/TT46, 61) and two males (ECNU20150420/TT47, 60) dissected.

Dimensions

(Female, n = 3) Length, 0.82–1.0 mm; height, 0.45–0.50 mm. (Male, n = 3) Length, 0.81– 0.84 mm; height, 0.45–0.46 mm.

Brief description

Female, maximum height of carapace almost equalling one-half of length. Both anterior and posterior ends wide. Several spines present along anterior and posterior margins. Natatory setae on A2 exceeding tips of terminal claws. L5 palp three-segmented. L6 four-segmented, and seta d1 present on basal segment. Claws Ga and Gp on UR equally long. More than two branches present on UR attachment.

Male, Zenker organ with 20–23 rows of chitinized rosettes.

Distribution

This species has been reported from Japan ( Okubo 1974), the far east of Russia ( Zenina and Schornikov 2008), and China, in the provinces of Fujian ( Sars 1903), Hunan ( Chen 1990), Sichuan ( Huang 1986), Jiangsu ( Yu et al. 2005) and Beijing ( Zhai and Zhao 2014).

Figures

Figure 22. (a–d) Ilyocypris angulata Sars, 1903. Female. (a) ripplets on LV; (b) ECNU20150420/TT46, external view of RV; (c) ECNU20150420/TT46, internal view of RV; (d) ECNU20150420/TT4601, dorsal view. (e–i) Ilyocypris dui sp. nov. (e) internal view of LV (f) ripplets on LV; (g) ECNU20140907/TT37, external view of RV (Male); (h) ECNU20140907/TT37, internal view of LV (Male); (i) ECNU20140907/ TT3801, dorsal view (Female). Scale bars: 100 μm.