Dentocypria, Savatenalinton, Sukonthip, 2017

Savatenalinton, Sukonthip, 2017, A new genus and four new species of subfamily Cyclocypridinae (Crustacea, Ostracoda) from Thailand, Zootaxa 4243 (2), pp. 329-365 : 330-331

Dentocypria n. gen.

Type species. Dentocypria mesquitai n. gen. n. sp.

Etymology. The genus is named after the internal tooth of the left valve. The name is a combination of “dente” (Latin for ‘with the tooth’; ablative of tooth, ‘dens’) with the existing generic name “ Cypria ”.

Diagnosis. Carapace ovate, subovate or elongated in lateral view, elliptical, subelliptical or subovate in dorsal view. LV overlapping RV anteriorly, ventrally, posteriorly, LVi with internal tooth on antero-ventral part, RV with tuberculated valve margin anteriorly and posteriorly and with complementary pit of internal tooth on antero-ventral part, A1 with seven segments. Long natatory setae of A2 reaching beyond tips of terminal claws, male A2 with divided penultimate segment, t2 and t3 setae transformed. Terminal segment of Md-palp very elongated (length c. 3–4 times of width). T2 without basal setae, e-seta unusually long. T3 with d1, d2 and dp setae on basal segment, gseta short, terminal segment short. CR well-developed, robust, ventrally with two parallel rows of setulae, length of Ga claw c. half of that of ramus, Sp long. Male T1 with asymmetrical prehensile palps, first segment of right prehensile palp with or without large distal protrusion. Hemipenis with elongated a-lobe, subtriangular b-lobe, alobe longer than b-lobe with different lengths. Zenker organ with seven spiny whorls.

Differential diagnosis. Dentocypria n. gen. is characterized by the internal tooth on the LV at the anteroventral part. It cannot be confused with any other genera in the Cyclocypridinae . The genus Cyclocypris is characterized by a long terminal segment in T3 (short in Dentocypria n. gen.), while Kempfcyclocypris is outstanding in the subfamily with regard to a 6-segmented A1. Allocypria possesses thick bristles with elongate setules on the 2nd and 3rd endite of Mx 1, while Keysercypria is defined by the absence of seta d2 on T3, as well as a strong length reduction of setae e, f, and g on the same appendage (both not the case in the new genus). The closest congeners of Dentocypria n. gen. are Physocypria Vávra, 1897 and Cypria Zenker, 1854 . It differs from Physocypria by seta d1 on T2 (present in Physocypria , not present in Dentocypria n. gen.) and from Cypria s.s. by the higher number of setae on the masticatory process on T1 (16 in Dentocypria n. gen., c. 13 in Cypria ), the tuberculated RV margin, the markedly long e-seta of T2, the long Sp seta of CR and the morphology of prehensile palps and hemipenis (see discussion).

Species included. Dentocypria mesquitai n. gen. n. sp., Dentocypria chantaranothaii n. gen. n. sp., Dentocypria smithi n. gen. n. sp. and Dentocypria aequiloba n. gen. n. sp.

Occurrence. Thailand (this study).