Oncocypris

Savatenalinton, Sukonthip, 2015, On three new species of non-marine ostracods (Crustacea: Ostracoda) from Northeast Thailand, Zootaxa 3914 (3), pp. 275-300 : 300

Key to species of Oncocypris

1. Penultimate segment of T2 undivided...................................................................... 2

- Penultimate segment of T2 divided....................................................................... 4

2. Carapace in dorsal view with beak-like anterior part, postero-dorsal margin of LV with a small round flange...... O. bhatiai

- Carapace in dorsal view without beak-like anterior part........................................................ 3

3. Carapace in lateral view with evenly arched, valve surface without large pits............................. O. chappuisi

- Carapace in lateral view without evenly arched, valve surface with large pits and covered by large pustules.... O. voeltzkowi

4. Carapace in dorsal view with beak-like anterior part.......................................................... 5

- Carapace in dorsal view without beak-like anterior part........................................................ 7

5. Carapace in lateral view with unevenly arched dorsal margin, valve surface with concentric ridges............ O. euglypha

- Carapace in lateral view with evenly arched dorsal margin, valve surface without concentric ridges..................... 6

6. Carapace in dorsal view with LV margin shorter than RV margin and both not curved, first segment of right prehensile palp with oblique distal margin towards to tip of second segment......................................... O. debundshae

- Carapace in dorsal view with LV and RV margins subequal and curved rightward, first segment of right prehensile palp with large protrusion on distal margin towards to second segment...................................... O. rostrata n. sp.

7. Carapace in dorsal view pear-shape, carapace in lateral view with broad rounded posterior end............... O. muelleri

- Carapace in dorsal view subquadrate, carapace in lateral view with angulated posterior end................ O. schoutedeni