Cypridopsis biwaensis, Smith, Robin J., Janz, Horst & Okubo, Ichiro, 2011

Smith, Robin J., Janz, Horst & Okubo, Ichiro, 2011, Recent Cyprididae and Ilyocyprididae (Crustacea: Ostracoda) from Lake Biwa, Japan, including a summary of the lake’s ostracod fauna, Zootaxa 2874, pp. 1-37 : 9

Cypridopsis vidua ( O. F. Müller, 1776)

( Figs 2 H and I)

For previous synonymies see Meisch (2000).

nomen nudum 2004 Cypridopsis biwaensis sp. nov. —Okubo: 38, figs 20 ad–af. Synonymy herein. nomen nudum 2008 Cypridopsis biwaensis Okubo, 2004 nomen nudum —Smith & Matzke-Karasz: table 1, pl. 2, fig. 9.

Remarks. Okubo (2004) reported this species as Cypridopsis biwaensis (a nomen nudum as no type material was designated or deposited), stating that the stripes of the carapace were different to those of C. vidua , specifically their colour (black in C. biwaensis , green in C. vidua ) and the presence of a horizontal bar linking the two centralmost stripes (missing in C. vidua ). However, such features attributed to C. biwaensis are known to exist in C. vidua , a very variable species (see the review of variation of this species in Meisch 2000). Therefore, herein C. biwaensis is considered to be a junior synonym of C. vidua . The carapace colouration is very variable in Lake Biwa, with specimens with black, grey, purple, brown, or green stripes, some with very strongly defined stripes, others with very weakly defined stripes, ranging from 3 to 5 in number, or with no stripes at all. The carapace shape is also rather variable with some specimens more ovate than others in dorsal view. Such wide variation is common in parthenogenetic species. The black striped variety of C. vidua is the most abundant one in the littoral zone of the lake. Localities ( Fig. 1 ): 1–10, 14, 15, 17–28, 30–37.

Figures

FIGURE 1. Location of Lake Biwa and sampling localities that yielded Cyprididae and Ilyocyprididae species.

FIGURE 2. A – E Bradleytriebella lineata. A—right lateral view of whole carapace (LBM 1430003539). B—internal view of right valve (LBM 1430003541). C—internal view of left valve (LBM 1430003541). D—dorsal view of whole carapace, anterior to top (LBM 1430003540). E—detail of surface of carapace (LBM 1430003539). F & G Bradleycypris vittata. F—right lateral view of whole carapace (LBM 1430003544). G—dorsal view of whole carapace, anterior to right (LBM 1430003545). H & I Cypridopsis vidua. H—left valve, external view (LBM 1430003546). I—dorsal view of whole carapace, anterior to right (LBM 1430003547). J & K Cypris sp. J—right lateral view of whole carapace (LBM 1430003548). K—dorsal view of whole carapace, anterior to right (LBM 1430003549). Scale bar = 268 µm for A – D, 103 µm for E, 393 µm for F & G, 359 µm for H & I, and 634 µm for J & K.