Ithycythara pentagonalis is a species of sea snail, a marine gastropod mollusc in the family Mangeliidae.
Tucker considers Ithycythara auberiana a synonym of Ithycythara pentagonalis Reeve, L.A., 1845.
Description The smooth, ivory white shell has an oblong-ovate shape. It is longitudinally five-angled. It shows compressed ribs at the angles, pointed at the upper part of the ribs.
Distribution This marine species occurs off St Vincent, West Indies.
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