Cavernocypris Hartmann 1964

GenusCavernocyprisHartmann, 1964 Type species. Cavernocypris subterranea (Wolf, 1920) Diagnosis (amended from Smith et al. 2017). Cp shorter than 0.8 mm, elongated or triangular in lateral view, dorsal margin distinctly arched with or without hump on LV. LV larger than RV, overlapping right along ventral margin. Valve margins with peripheral selvage. Anterior, posterior, and ventral margins with well-developed fused zones with numerous and regularly placed marginal pore canals. Calcified inner lamella broad to very broad anteriorly and posteriorly. Inner list (sometimes weakly developed) on posterior areas of inner calcified lamella of one or both valves. Ventral margin of valves with or without outer lists. Surface of valves smooth or pitted. Swimming setae of A 2 very short, scarcely extending beyond proximal margin of penultimate segment. Distal segment of Mx palp elongated, third endite (masticatory lobe) with two tooth-bristles. Respiratory plate of L 5 reduced. L 6 distinctly elongated. Seminiferous tubes of male simple loop (not spiral) in anterior part of Cp. Ur ramus tapering distally, not cylindrical. Nominated species included. Cavernocypris cavernosa Smith, 2011; Cavernocypris coreana (McKenzie, 1972); Cavernocypris danielopoli Smith & Kamiya, 2017 in Smith et al. (2017); Cavernocypris hokkaiensis Munakata et al., 2022; Cavernocypris reddelli Külköylüoğlu, 2020; Cavernocypris subterranea (Wolf, 1920); Cavernocypris wardi Marmonier et al., 1989; and Cavernocypris xiangi sp. nov.