Ptychodactis is a genus of sea anemones. It is the only genus in the monotypic family Ptychodactinidae.
Species There are two species recognized in the genus: Ptychodactis aleutiensis Eash-Loucks, Jewett, Fautin, Hoberg & Chenelot, 2010 Ptychodactis patula Appellöf, 1893
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