Okenia impexa is a species of sea slug, specifically a dorid nudibranch, a marine gastropod mollusc in the family Goniodorididae.
Distribution This species was described from Brazil. It is known from Brazil north to North Carolina, USA. It has also been reported from the western Mediterranean and the Cape Verde Islands.Rudman, W.B., 2004 (December 22) Okenia impexa Baba, 1938. [In] Sea Slug Forum. Australian Museum, Sydney.
Description This Okenia has a tall body and about five or six lateral papillae on each side of the mantle.Valdés, Ángel; Hamann, Jeff; Behrens, David W.; DuPont, Anne. Caribbean Sea Slugs, Sea Challengers Natural History Books, Etc., Gig Harbor, Washington 2006, pp. 116-117. page 124.
The maximum recorded body length is 3–4 mm or up to 7 mm.Welch J. J. (2010). "The “Island Rule” and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. doi:10.1371/journal.pone.0008776.
Habitat Minimum recorded depth is 0 m. Maximum recorded depth is 0 m.
Ecology The diet of this species is unknown but the shape of the animal resembles ascidian eating species of Okenia such as Okenia aspersa.
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