Showajidaia sagamiensis is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Showajidaiidae.MolluscaBase eds. (2020). MolluscaBase. Showajidaia sagamiensis (Baba, 1937). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=1423469 on 2020-07-27Baba, K. (1937). Two new species of the nudibranchiate genus Cadlina from Sagami Bay, Japan. The Japanese Journal of Malacology. 7: 75-80.
Distribution Known only from the central part of the Pacific coast of the Japanese island of Honshu, including Sagami Bay and Suruga Bay.
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