Cumanotus fernaldi is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Cumanotidae.Rosenberg, G. (2011). Cumanotus fernaldi Thompson & Brown, 1984. In: MolluscaBase (2017). Accessed on 2018-01-16.

Distribution This species was described from the San Juan Islands, British Columbia, Canada, .

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