Ancula gibbosa colour variety

May 19, 2000
From: Sandra Millen

Concerning the earlier discussion on Ancula gibbosa and A. pacifica. I have always felt that Ancula pacifica MacFarland, 1905 was the same species as A. gibbosa (Risso, 1818). Gary McDonald (1983) has discussed how similar they are except for yellow lines on the body of A. pacifica which are often discontinuous. In British Columbia and Alaska, the yellow lines are absent altogether. I am sending a photo of yet another colour variety, with white spots. These spotted animals are usually seen crawling on mud bottoms along with unspotted specimens. I have seen them several times near Vancouver, but did not have a good photo until now. This animal was spotted by Donna Gibbs of the Vancouver Aquarium and the photo taken by her husband Charlie. Charlie says "Donna has the ultimate in point and shoot photography, she points, I shoot".
Thanks to them both.
Sandra Millen

Millen, S., 2000 (May 19) Ancula gibbosa colour variety. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Sandra,
Thanks for sharing this beautiful photo and another colour form. all we need now is the 'typical' form with orange. Donna has definitely developed a superb photographic method.
Bill Rudman.


Ancula gibbosa

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