Alcyna
''Alcyna'' is a genus of sea snails, marine (ocean), marine gastropod mollusks in the family (biology), family Trochidae, the top snails. This genus was previously included in the family Phasianellidae. Description The minute shell is similar in form to ''Phasianella''. The Aperture (mollusc), aperture is ovate. The Columella (gastropod), columella has a heavy callus, bearing near the base a strong curved denticle projecting into the aperture. The outer Lip (gastropod), lip is simple. The imperforate shell is acutely ovate. The convex Whorl (mollusc), whorls are spirally lirate and longitudinally striate. The Columella (gastropod), columella is callous, and toothed below. The outer Lip (gastropod), lip is smooth or toothed within, and varicose exteriorly. Species Species within the genus ''Alcyna'' include: * ''Alcyna acia'' Cotton, 1948 * ''Alcyna australis'' Hedley, 1907 * ''Alcyna exigua'' (Gould, A.A., 1861) * ''Alcyna kingensis'' (Gabriel, 1956) * ''Alcyna lifuensis'' Melv ...
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