Cypris

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

Cypris sp.

( Figs 2 J & K)

1859 Cypris subglobosa Sowerby, 1840 —Baird: 232, pl. 1, figs 7a–b.

nov. comb. 1886b Chlamydotheca subglobosa ( Sowerby, 1840) —Brady: 300, pl. 38, figs 24–27a. nov. comb. 1906 Eurycypris subglobosa ( Sowerby, 1840) –Vávra: 420, pl. 24, figs 9–13.

1912 Cypris subglobosa Sowerby, 1840 —G. W. Müller: 180.

1968 Cypris subglobosa Sowerby, 1840 —Bhatia: 470, pl. 1, figs 2a–g, pl. 5, fig. 10.

1972 Cypris subglobosa Sowerby, 1840 —Okubo: 61–72, pls 1–4.

1976 Cypris subglobosa Sowerby, 1840 —Neale: 125–132.

1977 Cypris subglobosa Sowerby, 1840 —Hanai et al.: 22.

1979 Cypris subglobosa Sowerby, 1840 —Victor & Fernando: 159–161, figs 16–30.

1982 Cypris subglobosa Baird, 1859 —Victor & Fernando: table 1.

1985 Cypris subglobosa Sowerby, 1840 —Martens & Toguebaye: 147–153.

1988 Cypris subglobosa Sowerby, 1840 —Bronshtein: 128, fig. 36, 1–2, pl. IV, 1.

1989 Cypris subglobosa Sowerby, 1840 —Okubo & Ida: 106, pl. 4, c–d.

1998 Cypris subglobosa Sowerby, 1840 —Rossi et al.: 262, table 1.

2000 Cypris subglobosa Sowerby, 1840 —Okubo: 116, figs 31 a–d.

2003 Cypris sp.—Whatley et al.: 1290.

2004 Cypris subglobosa Sowerby, 1840 —Okubo: 28, figs 13 e–h.

2005 Cypris subglobosa Sowerby, 1840 —Yu et al.: 145, pl. 1, figs 2– 4.

2009 Eurycypris subglobosa ( Sowerby, 1840) —Yu et al.: 36.

Remarks. Living representatives of this species are commonly identified as ‘ Cypris subglobosa Sowerby, 1840 ’. However, the taxonomic name of living specimens of this species is currently in a state of uncertainty. The syntypes of Cypris subglobosa , fossil material from the Upper Cretaceous of India, and living representatives commonly attributed to C. subglobosa have been shown to belong to two different genera ( Whatley et al. 2003). The fossil syntypes were reassigned to the genus Paracypretta , i.e. Paracypretta subglobosa ( Sowerby, 1840) . Whatley et al., (2003) considered that living specimens belong to the genus Cypris . This extant species has not been named yet (Whatley pers. comm.), so herein is called Cypris sp.

This species was found in high abundance amongst a large patch of lotus off the Karasuma Peninsula, with a pH of 8.8. Broodbakker (1988) recorded a pH range of 7.9 to 9.8 (average 8.6) at eight sites in Japan where he collected this species. In Japan at least, this species seems to prefer alkaline waters. This species has been recorded from rice fields in Japan, but this is the first record from a Japanese lake, although it has been recorded from Lake Taihu, China ( Yu et al. 2005). The high abundance and presence of a range of juveniles indicates that it is breeding in the lake and not simply washed in from surrounding rice fields. Localities ( Fig. 1 ): 18, 25.

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.