Bradleycypris vittata ( Sars, 1903 )

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 : 1842-1844

Bradleycypris vittata ( Sars, 1903)

( Figures 10d–f , 11 )

Cypris vittata sp. nov. Sars, 1903: 22, pl. II, fig. 3.

Strandesia vittata comb. nov. Tressler, 1937: 197.

Bradleycypris vittata comb. nov. Savatenalinton and Martens, 2010: 3.

Material examined

Two females (ECNU20140914/TT19, 29) dissected.

Dimensions

(Female, n = 3) Length, 0.71–0.81 mm; height, 0.41–0.50 mm, width, 0.40 mm.

Brief description

Female, carapace with small pits and four purple bands. In lateral view, anterior end wider than the posterior. LV overlapping RV both anteriorly and posteriorly, and RV overlapping LV dorsally. A1 with Rome and Wouters organs. Natatory setae on A2 exceeding tips of terminal claws. Seta β on the Md short and hirsute, basally inflated, tapering distally; seta γ smooth. Two large bristles on third masticatory lobe of Mx1 slightly toothed. L6 five-segmented, seta d1 longer than seta d2, setae e and f long. L7 with three d setae on basal segment. UR stem slender. Claw Gp more than one-half length of claw Ga. Seta Sa equalling one-half length of claw Ga. UR attachment with Triebel’ s loop on main branch, with dorsal and ventral branches well-developed.

Distribution

This species has been reported from the Oriental and Palaearctic Regions ( Martens and Savatenalinton 2011). In China, this species has been recorded from Fujian ( Sars 1903), Sichuan ( Huang 1986), Jiangsu ( Yu et al. 2005) and Beijing ( Zhai and Zhao 2014).

Remarks

According to Martens and Savatenalinton (2011), there are only two species, Bradleycypris obliqua ( Brady, 1868) and Bradleycypris vittata ( Sars, 1903) , in the genus Bradleycypris . They can be distinguished from each other by the following characters: (1) length of the carapace – the length in B. obliqua is about 1.20–1.30 mm ( Meisch 2000; Karanovic 2005), whereas B. vittata is about 0.81–0.89 mm ( Savatenalinton and Martens 2010; Zhai and Zhao 2014); (2) margin of carapace in dorsal view – the anterior margin of the carapace is rounded in B. vittata , although it is asymmetrically beak-like in B. obliqua ( Savatenalinton and Martens 2010) ; (3) length of seta g on L6 – seta g is equal in length to seta h 1 in B. obliqua , whereas in B. vittata it is shorter than seta h1 ( Meisch 2000; Savatenalinton and Martens 2010).

Compared with other reports of B. vittata , the carapace lengths of our specimens are smaller than those from Thailand ( Savatenalinton and Martens 2010) and similar to those from Beijing ( Zhai and Zhao 2014); the overlap of the anterior margin is more obvious; setae f and h3 of the L6 ( Figure 11b ) are shorter in Chinese specimens (including Beijing and our specimens) than those of Thailand’ s specimens ( Savatenalinton and Martens 2010; Zhai and Zhao 2014).

Figures

Figure 10. (a–c) Cypretta turgida (Sars, 1896). Female. (a) ECNU20140907/TT0701, external view of LV; (b) ECNU20140907/TT07, internal view of RV; (c) ECNU20140907/TT0702, dorsal view. (d–f) Bradleycypris vittata (Sars, 1903). Female. (d) ECNU20140914/TT19, internal view of LV; (e) ECNU20140914/TT1901, dorsal view; (f) ECNU20140914/TT1902, oblique posterior view. Scale bars: 100 μm.

Figure 11. Bradleycypris vittata (Sars, 1903). ECNU20140914/TT29. Female. (a) A2; (b) L6; (c) UR. Scale bars: 100 μm.