Nealecypris obtusa ( Klie, 1933 )

Nagler, Christina, Geist, Juergen & Matzke-Karasz, Renate, 2014, Revision of the genus Tanycypris (Ostracoda, Cypricercinae) with the description of Tanycypris alfonsi n. sp., and an identification key to the genus, Zootaxa 3821 (4), pp. 401-424 : 420

Nealecypris obtusa ( Klie, 1933)

( Figs 5D , 6A,F , 7A )

v * 1933 Dolerocypris obtusa Klie : 98–99, Figs 5–7 .

1971 Tanycypris obtusa — McKenzie: 172, 198.

v 2009 a Nealecypris obtusa – Savatenalinton & Martens: 8–12, Figs 2A , 3A , 5A–H , 6A–F , 7A–D .

Diagnosis. L = 1.1–1.2 mm, H = 0.35–0.40 mm, W = 0.20–0.25 mm; greatest height at the anterior third of the length. Valves in lateral view elongated. Carapace in dorsal view narrow and acuminate at both ends. Dorsal margin weakly arched, sloping posteriorly. Anterior margin broader rounded than posterior margin. Ventral margin almost straight. Carapace surface smooth. Valves very thin. A1 ( Fig. 5D ) with a small Wouters organ and a very small Rome organ. T1 with two a-setae, one b-seta, without d-seta ( Fig. 6F ), males with asymmetric T1. T2 with large d1 and short, slim d2. CR stout ( Fig. 6A ). Sp inconspicuous and fringy with a pointed tip. CR attachment without vb and a slim, long db ( Fig. 7A ). Zenker organ with 24 rosettes of chitinous spines; hemipenis with subequal shields, small ( Klie 1933; Savatenalinton & Martens 2009a).

History. Klie (1933) described Dolerocypris obtusa , which he found in the Lake Chrissie area in Transvaal and deposited the material in ZMK (No. CR—1071). McKenzie (1971) transferred the species to Tanycypris . Savatenalinton & Martens erected the new genus Nealecypris for this species (2009a).

Conclusion. After examination of the holotype and additional material from Thailand, we confirm the assignment of this species to the genus Nealecypris , characterized by the lack of b-seta on T1, the lack of vb on CR attachment and the lack of a groove in the anterior part of the inner lamella in LV. However, using the presence/ absence of the Wouters organ as a character to distinguish between Tanycypris (Wouters organ absent) and Nealecypris (Wouters organ present), as suggested by Savatenalinton & Martens (2009a), cannot be followed, since the Wouters organ is present in all Tanycypris species as well.

Figures

FIGURE 2. Tanycypris alfonsi n.sp. A, RV interior view; B, LV interior view; C, RV exterior view; D, LV exterior view; E, Carapace in ventral view; F, Carapace in dorsal view; G, Rome organ; H, Wouters organ.

FIGURE 3. Tanycypris alfonsi n. sp. (ZSMA 20130101). A, An1; B, An2; C, Mx; D, An2-Detail; E, Md; F, Md palp. Scale bar = 100 µm for A–F.

FIGURE 5. First antennae. A, Tanycypris centa (after Chang et al. 2012); B, T. pellucida; C, T. siamensis (after Savatenalinton & Martens 2009a); D, N. obtusa; E, T. madagascarensis. Scale bar = 100 µm for A–E.

FIGURE 6. Caudal rami and first thoracopod. A, CR Nealecypris obtusa; B, CR Tanycypris pellucida; C, CR T. siamensis (after Savatenalinton & Martens 2009a); D, CR T. centa; E, CR T. madagascarensis; F, T1 (female) N. obtusa; G, T1 (female) T. pellucida; H, T1 (female) T. siamensis (after Savatenalinton & Martens 2009a); I, T1 (female) T. centa (after Chang et al. 2012); J, T1 (male) T. madagascarensis. Scale bar = 100 µm for A–J.

FIGURE 7. Caudal ramus attachments. A, Nealecypris obtusa; B, Tanycypris madagascarensis; C, T. centa; D, T. pellucida; E, T. siamensis (after Savatenalinton & Martens 2009a). Scale bar = 100 µm for A–E.