Okenia vena is a species of sea slug, specifically a dorid nudibranch, a marine gastropod mollusc in the family Goniodorididae.
Distribution This species was described from northern New South Wales, Australia. It is known only from eastern Australia.Rudman, W.B., 2004 (December 21) Okenia vena Rudman, 2004. [In] Sea Slug Forum. Australian Museum, Sydney.
Description This Okenia has a narrow body and seven to eight lateral papillae on each side and papillae in the middle of the back. The body is white and the rhinophores are brown. There is a pattern of broken brown lines on the back and tail.
Ecology The diet of this species is the ctenostome bryozoan Amathia tortuosa.
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