Stenocypris derupta Vávra, 1906

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 : 1850

Stenocypris derupta Vávra, 1906

( Figure 18a )

Stenocypris derupta sp. nov. Vávra, 1906: 413–438.

Material examined

Five empty valves collected and measured, all preserved in micropalaeontological slides (ECNU20140913/TT65.1–5).

Dimensions

(Female, LV, n = 2) Length, 2.32–2.50 mm; height, 0.87–0.98 mm.

Brief description

In lateral view, dorsal margin arched. Ventral margin straight. Anterior end wide. Postero-ventral margin sharply pointed. Marginal septa present.

Distribution

Stenocypris derupta was reported from Indonesia ( Vávra 1906) and India ( Patil and Talmale 2005). In China, this species has been recorded from Hubei ( Chen 1956), Jiangxi ( Zhang et al. 1994) and Jiangsu ( Yu et al. 2005).

Remarks

There are 37 species in the genus Stenocypris ( Martens and Savatenalinton 2011) . Among them, the postero-ventral margin of seven species is sharply pointed, such as Stenocypris acuta Vávra , Stenocypris akatovae Semenova , S. derupta Vávra, 1906 , Stenocypris dybowskii Grochmalicki , Stenocypris maxillaris Kiss , Stenocypris pancratovae Akatova , and Stenocypris sohni Deb, 1983 . Six of these species, not including S. maxillaris , have no spines on the margin of RV. Moreover, the posterior end of the carapace is sharper in S. acuta than in S. derupta , and less pointed in S. akatovae , S. dybowskii , S. pancratovae and S. sohni compared with S. derupta . Among these seven species, three have been reported from Asia: S. derupta ( Chen 1956; Zhang et al. 1994; Yu et al. 2005; Karuthapandi et al. 2014), S. pancratovae (Karanovic 2012) and S. sohni ( Deb 1983) ; S. akatovae from Europe; and the other species were reported from Africa.

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.