37. Obesostoma setosum (Okubo, 1980) (Fig. 37)

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Paradoxostoma setosum Okubo, 1980 .

Obesostoma setosum (Okubo, 1980) Schornikov (1993) .

Material examined. Yeosu-si (34°43.165′N, 128°1.421′E), Korea; collected by I Karanovic on 20 August 2013 .

Deposition. NIBRIV0000835144.

World distribution. Japan and Korea.

Diagnosis. Size about 1 mm. Left valve sub-elliptical; greatest height half of length, just behind the middle. Dorsal margin evenly arched. Anterior and posterior margins narrowly rounded. Ventral margin almost straight along anterior half, ascending toward posterior end. Right valve similar to the left; caudal process more prominent. Selvage well-developed.