Okenia rosaceaHopkinsia rosacea MacFarland, 1905 Hopkin's rose nudibranch is a species of sea slug, specifically a dorid nudibranch, a marine gastropod mollusc in the family Goniodorididae.

It can be found along the coast of western North America from Oregon to Baja California.

[5] These pink sea slugs are characterized by numerous long papillae on their back, tapering into a round tip.

This pink color is produced by the xanthophyllic pigment hopkinsiaxanthin, most likely obtained through feeding on the cheilostomatous bryozoan, Integripelta bilabiata.

The shape of the taenioglossan radula is unique in this family, as the middle tooth is large and elongate, ending in a hook-like tip.