Re: Aldisa sanguinea from British Columbia

November 4, 2005
From: Jeff Goddard

Hi Bill,
Marli's specimen [message #15161] is unquestionably Aldisa sanguinea and represents a significant range extension from the previous northernmost locality in Oregon. The dorsal papillae are broader and more widely spaced than in Rostanga pulchra, and the egg ribbon is characteristic and not at all like the tightly coiled string of Rostanga. Aldisa sanguinea usually has two dark spots on the midline of the dorsum, but one or both may be absent. I have seen a number of specimens in Oregon just like Marli's.
You are also quite correct in your supposition about the sponge prey of Marli's specimen. Although I only have food records for three individuals, they were all on a red, thinly encrusting species of Hymedesmia.

Best wishes,
Jeff

goddard@lifesci.ucsb.edu

Goddard, J.H.R., 2005 (Nov 4) Re: Aldisa sanguinea from British Columbia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15173

Dear Jeff,
Thanks for the quick response. Not trying to be tricky or anything but can you get Aldisa cooperi with no black spots, and if so is there any way to distinguish it from an A. sanguinea like this externally?
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Nov 4). Comment on Re: Aldisa sanguinea from British Columbia by Jeff Goddard. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15173

Factsheet

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