Homalopoma nocturnum is a species of sea snail, a marine gastropod mollusc in the family Colloniidae.
Description The size of the shell varies between 4 mm and 7 mm. The small, solid shell has a globose shape. It has 4-4½ rotund whorls, marked with subgranulose transverse ribs. The suture is obvious. The rotund aperture is iridescent and pearly within. The lip is thickened.G.W. Tryon (1888), Manual of Conchology X; Academy of Natural Sciences, Philadelphia (described as Leptothyra rubra and identified as Collonia rubra)
Distribution This marine species occurs off Southern Japan.
References
Lee, J.J., 1990. Bioecological study of the northern coastal area in Chenju Island. Korean Journal of Malacology 6(1):33–44
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