Velutinids are prosobranch gastropods of the  family Velutinidae (sometimes referred to as the family Lamellariidae). Known Hawaiian species have a fully internal shell covered by the mantle (some species from elsewhere have external shells). The mantle is often elaborately colored or ornamented. They are frequently mistaken for dorid nudibranchs. They may be distinguished by their cephalic tentacles that emerge from beneath the mantle and by the bulbous eye spots at the bases of those tentacles. They feed on colonial tunicates. A few of the species most frequently mistaken for sea slugs:

Lamellaria sp. #2 CP: Airport Beach, Maui; Aug. 7, 2002	Lamellaria(?) sp. #10 CP: Kahului Harbor, Maui;  April 8, 2010	Marseniopsis sp. #1 (red) CP: Maalaea Bay, Maui; Oct. 22, 2007
Marseniopsis sp. #1 (yellow) CP: Napili Bay, Maui;  Sept. 12, 1998	Lamellaria sp #1 CP: Kapalua Bay, Maui; April 17, 2009	Coriocella nigra CP: Kapalua Bay, Maui; May 22,  2008

For more information see:   The prosobranch addendum for Velutinidae on this site   Hawaiian velutinids on Marine Life Photography by Keoki & Yuko Stender   Kwajalein velutinids by Scott & Jeanette Johnson   Australian velutinids by Denis Riek   Velutinids on Guam Marine Life by Dave Burdick Velutinids on the Sea Slug Forum by Bill Rudman