Re: Aldisa sanguinea from British Columbia

November 5, 2005
From: Brian K. Penney

I can confirm that I also saw forms like Marli photographed [message #15161]  in my time at Bamfield (on the west coast of Vancouver Island, about one degree south and west of Campbell River). As Jeff indicated in his message [#15173], we can be sure they are not Rostanga pulchra because the dorsal surface is covered with papillae rather than caryophyllidia. I also have no records of collecting Rostanga that were 20 mm long (most were 15 mm or under) or that deep: I always saw them at 3m or less depth.

At Bamfield I found Aldisa cooperi at 10-12 m, but they always were yellow to cadmium orange, never to carrot orange or darker, and I always remember them having spots, though my sample size is less than ten.

The two individuals I have in my notes that match Marli's specimen were 11 and 12 mm respectively, and collected at Scott's Bay, Barkley Sound at a depth of 3-4m in November of 1998. They were approximately the shade of orange in the photograph and lacked dorsal spots or depressions.

Locality: Scott's Bay, Barkley Sound (48º50'06"N, 125º08'48"W). British Columbia, Canada. Pacific Ocean. Depth: 3-4 m. Length: 11 and 12 mm. 9 November 1998. Subtidal, semi-protected boulder/bedrock in kelp bed

Hope that's not too excessive detail.

Penney, B.K., 2005 (Nov 5) Re: Aldisa sanguinea from British Columbia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Brian,
Thanks for this. It's certainly not too much information and I suspect confirms my suspicion that the animal in Marli's message I am posting today [#15178] is Aldisa cooperi rather than Rostanga.
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Nov 5). Comment on Re: Aldisa sanguinea from British Columbia by Brian K. Penney. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


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