Onchidoris diademata is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Onchidorididae.Rosenberg, G. (2015). Onchidoris diademata. In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2016-01-21.
Distribution This species was described from Massachusetts on the Atlantic Ocean coast of the United States.
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