On a new cypridopsine genus (Crustacea, Ostracoda, Cyprididae) from the Upper Paraná River Floodplain (Brazil) Author Higuti, Janet Author Martens, Koen text Zootaxa 2012 3391 23 38 journal article 10.5281/zenodo.208653 324088d2-84e5-4686-b973-7389a0b8140a 1175-5326 208653 Cabelodopsis n. gen. Type species: Cypridopsella hispida Sars, 1901 (here designated) Origin of name: the name is a contraction of “Cabelo” meaning ‘hair’ in Portuguese (referring to the hirsute aspect of the type species) and ‘opsis’, referring to the genus typicus of the subfamily, Cypridopsis . Diagnosis : Carapace hirsute, but without external valve ornamentation and of medium size, LV overlapping RV on all sides, RV with large posterior selvage, LV with large, double posterior inner list. Hinge simple and adont, LV at the apex with a slight cardinal groove. A2 with end claw G2 very wide and stout in the female, and with a series of rounded teeth in the distal 2/3. Distal segment of Mx1-palp elongated, ca. three times as long as basal width. T2 with penultimate segment divided, seta d1 absent, d2 of medium length. FIGURE 2. Va l ves of Cabelodopsis hispida n. gen. , all female (specimen of illustrations A–F (KM.3418= lost). A. LV, internal view. B. LV, internal view, detail of anterior part. C. LV, internal view, detail of posterior part. D. RV, internal view. E. RV, internal view, detail of anterior part. F. RV, internal view, detail of posterior part. G. Cp, left lateral view (OC.3276). H. RV, detail of postero-ventral part, tilted (OC.3274). I. Cp, dorsal view (OC.3275). J. Cp, ventral view (OC.3277). Scale bars: A, D, G, I, J, 200 Μm; and B, C, E, F, H, 100 Μm. The genus is thus far monospecific Differential diagnosis: the new genus is closely related to Zonocypris with which it shares the short and stout claw G2, by which both genera are easily separated from all other cypridopsine genera. The new genus furthermore differs from Potamocypris by the cylindrical distal palp segment of the Mx1 (spatulate in Potamocypris ). From Zonocypris s. s. , Cabelodopsis n. gen. can be distinguished by the absence of prominent valve surface ornamentation (present in all Zonocypris s. s. ), and by its most hirsute aspect (absent in Zonocypris s. s. ). The other main differences are in the hinge, which is simple and adont in Cabelodopsis n. gen. , but which has a relatively welldeveloped postero-dorsal tooth in Zonocypris s. s. , either in the RV or in the LV.