Aldisa sanguinea from British Columbia

November 4, 2005
From: Marli Wakeling

Hi Bill,
Found this Aldisa sanguinea with an egg ribbon, and perhaps its food sponge when visiting Campbell River last month; it's always a great locale for interesting nudibranchs.

Locality: Campbell River, British Columbia, Canada, Pacific coast. Depth: 40 feet. Length: 20 mm. 09 October 2005. Rock wall. Photographer: Marli Wakeling


Wakeling, M., 2005 (Nov 4) Aldisa sanguinea from British Columbia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Marli,
The photo well illustrates the dangers of identifying food sponges. I guess the food of this animal is not the two obvious sponges - the blue-grey one at the bottom, or the brownish one at the top, but the red one the slug is actually sitting on and appears to have eaten most of, except for a bit just above the slug around two barnacles.

I would like some guidance from west coast experts please on the identity of this slug. I thought A. sanguinea usually 2 or 3 large dark spots in the dorsal midline, and the other Aldisa, A. cooperi, had a series of little dark spots in the midline. The gills and rhinophores don't give many clues as I can't see any detail, but is it possible this is Rostanga pulchra? Hopefully the nice egg ribbon will give someone familiar with the fauna a clue.
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Nov 4). Comment on Aldisa sanguinea from British Columbia by Marli Wakeling. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Aldisa sanguinea

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