June 23, 2001
From: Paul Young
Locally this is usually called the White Atlantic Cadlina or the White Doris. We believe it is C. laevis.
It eats sponges. It is locally common North of Cape Cod, [New England, USA - Atlantic coast]. We usually find lots of them or none at all. They are about 3 cm long.
email@example.comYoung, P., 2001 (Jun 23) Cadlina from New England. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/4618
I think you have another interesting animal here, but I have no personal experience of these northern hemisphere species of Cadlina. My understanding is that Cadlina laevis has white capped tubercles, and the only yellow it has are in the mantle glands, which form a submarginal row along each side of the mantle.
There are a number of species with a similar colour pattern. If you ignore those species with dark gills and rhinophores, there are a few species with a similar colour pattern. Most similar is Cadlina luteomarginata MacFarland, 1966, which is found on the west coast of North America, and has also ben reported from the east coast (Bleakney, 1996. It has a yellow mantle border and the low mantle tubercles can be tipped with yellow. The translucent white gills are tipped with yellow. Cadlina rumia Marcus, 1955 which is found in the west Atlantic from Florida to Brazil, and Cadlina modesta Macfarland ,1966 which lives on the west coast of Nth America, are both translucent white with a submarginal row of yellow glands, much like in C. laevis.
Basically your photo dosn't seem to fit any described species. Comments from anyone would be very welcome