Onychochilus minutissimus Y00

Onychochilus minutissimus Yoo, 1988: 240, figs 12-14.

Additional material. 3 specimens (F78356) .

Remarks. This species is extremely rare and small in size; a total of seven specimens have been recovered from the type locality, including four specimens in previous investigations (Yoo, 1988). The shells exhibit perfectly balanced adult forms with a sharp boundary between protoconch and teleoconch. This species differs from the type species O. physa Lindstrom in being much smaller in size and in lacking ornamentation.