As Ondina minutiovum (Nomura):
Ondina minutiovum is characterized by 1) ovate shell attaining 2.6 mm in height, 2) protoconch intorted, only the last half whorl showing from the first teleoconch whorl, 3) spire whorls convex, meeting at adpressed sutures, 4) body whorl oval, 75% of total height, rather quickly tapering at the base, 5) aperture drop-shaped, slightly exceeding one-half the total height; inner lip gently sinuous; basal lip expanded abapically and somewhat everted; slight subhorizontal fold at the adapical end of columella, 6) outer surface with faint spiral microsculpture and dense, gently opisthocline, reverse-S-shaped growth lines that form a shallow subsutural sinuation. The present species is herein assigned to the genus Ondina de Folin, 1870, on the basis of intorted protoconch, slight columellar fold, and course of the growth lines (cf. VAN AARTSEN, 1984).
DISTRIBUTION AND HABITAT. Ondina minutiovumsisieri was hitherto known from Japanese waters. There is no information about its ecological requirements.
FOSSIL RECORDS. Holocene of Thailand.