Thaicypris, Savatenalinton, 2022

Savatenalinton, Sukonthip, 2022, On Thaicypris panhai gen. et sp. nov., a new herpetocypridine ostracod (Crustacea: Ostracoda: Cyprididae) from Thailand, European Journal of Taxonomy 787 (1), pp. 86-103 : 88-89

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gen. nov.

Thaicypris gen. nov.

Type species

Thaicypris panhai gen. et sp. nov. (here designated)


The name is a combination of ‘Thai-’ and the existing generic name ‘cypris’ to refer to the discovery of this taxon from Thailand.


Cp elongated (length ca 2.2 mm), in dorsal view elongated with widened posterior half (not compressed), LV overlapping RV on all sides, LV with prominent double posterior inner list, RV with prominent and raised, inwardly displaced selvage at postero-ventral part appearing not parallel to valve margin and without anterior and posterior inner list, fused zone of LV wider than RV, marginal pore canals present. Calcified inner lamella of both valves wide anteriorly, narrower posteriorly. A1 with small Rome organ. Natatory setae on A2 long (reaching tip of terminal claws). Md-palp with three claws and four setae on terminal segment, α-seta elongated with narrow base and long, needle-like tip, γ-seta large, elongated. Mx1-palp with spatulated terminal segment and basal segment with seven setae. Setae d1 and d2 on T2 subequal in length. CR symmetrical and slender, Sp seta long and slender (true seta), claw Ga long, claw Gp short. CR attachment with basal triangle. Male T1 palps asymmetrical and with pointed projection at inner base of terminal segment. ms of hemipenis with widely rounded distal margin and without elongated protrusion, mls with long, beak-like distal part, vls with rounded margin and without protrusion.

Differential diagnosis

Thaicypris gen. nov. is similar to Herpetocypris and Ilyodromus . In the new genus, the inwardly displaced selvage on the RV postero-ventral part and the double posterior inner list on the LV are prominent, raised and lay far apart from the valve margins that are clearly different from conditions in the two related taxa. In addition, Thaicypris gen. nov. can be distinguished from them by the obviously slender CR with thin claws and setae, the small and three-segmented Rome organ and the different morphology of α-, β- and γ-setae on the Md-palp. The hemipenis structures of the new genus also represent significant differences, especially the long, beak-like protrusion on the distal part of the medial lateral shield that is not present in Herpetocypris and Ilyodromus or even in other herpetocypridine genera.


Thailand (present study).