Diagnosis. Marine Euplotes with 10 conspicuous dorsal ridges, 100–170 × 80–120 μm in vivo. Adoral zone comprising about three-quarters of the total cell length, with about 48 membranelles; consistently 10 frontoventral, five transverse and two marginal cirri, and, generally, two or three caudal cirri, with second cirrus prolonged significantly; 11 dorsal kineties with about 16 dikinetids in mid-dorsal row. Macronucleus variable in shape, anterior part typically C-shaped with posterior part distorted.

Data are based on protargol-impregnated specimens.

Type location. Isolated from the Arabian Gulf (26°33′07″N, 50°01′30″E) on 16 December 2011. Salinity about 65‰ and water temperature about 17°C.

Type specimens. The slide (registration number: CXR- 20111216 -20-01) containing the holotype specimen (Figs 8, 9, 27, 28) and one paratype slide (registration number: CXR- 20111216 -20-02) with protargol-impregnated specimens have been deposited in the Laboratory of Protozoology, Ocean University of China, Qingdao.