Paranacypris, Higuti & Meisch & Martens, 2009

Higuti, Janet, Meisch, Claude & Martens, Koen, 2009, On Paranacypris samambaiensis gen. nov., sp. nov. (Crustacea, Ostracoda), the first South American psychrodromid from the alluvial valley of the Upper Paraná River, Brazil, Journal of Natural History 43 (13 - 14), pp. 769-783 : 772

Paranacypris gen. nov.

Type species

Paranacypris samambaiensis gen. nov. sp. nov. (here designated)

Derivation of name

Named after the Brazilian River Paraná, together with ‘‘Cypris’ ’.

Diagnosis

Elongated carapace, narrow in dorsal view, with large anterior LV. RV overlap, external valve surface set with large pores. Rome organ on A1 of medium size. Mx1 with spatulate distal palp segment; respiratory plate with five ‘‘reversed’’ proximal setae. T1 with special ‘‘e’’-seta (distal of ‘‘d’’-seta). T2 with seta d1 very long, d2 absent. Caudal ramus with posterior seta a stout spine.

The genus is monospecific.

Differential diagnosis

The new genus differs from all other genera ( Psychrodromus , Humphcypris and Somalicypris ) within the Psychrodromini by the large anterior LV. RV overlap, the long natatory setae on A2, the spatulate distal segment of the Mx1 palp and the complete absence of seta d2 on T2.

Remarks

Martens (2001) created the tribe Psychrodromini with the main distinguishing features a rectangular Mx1 palp and setae d1 on T2 being much longer than d2. The discovery of the present genus, undoubtedly close to Psychrodromus and therefore belonging in the same lineage, necessitates the adaptation of the tribal diagnosis (see above).