Aldisa? from the Canary Islands

March 30, 2001
From: Erwin Koehler

Dear Bill,
Here is the next one from the Canary Islands, taken by Arthur J. Telle,
email: mercedes@idecnet.com

size 6-7mm, depth 0.5m, Gran Canaria Island

Is it Aldisa?
Erwin

Erwin@medslugs.de

Koehler, E., 2001 (Mar 30) Aldisa? from the Canary Islands. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/4049

I would agree that this is probably a species of Aldisa from the red colour and the two darker spots between the gills and the rhinophores. I thought this should be easy to identify but a look at the literature suggest a bit of confusion in the species of Aldisa from the Mediterranean and surrounding seas. There seem to be at least two red species with two darker spots on the back, and white transverse marks across the mantle.

•Aldisa banyulensis Pruvot-Fol 1951 is said to have 8 gills and feeds on Hemymicale columella. It is small growing 8-12mm long
•Aldisa binotata Pruvot Fol 1953 [= Aldisa smaragdina Ortea, Perez, Llera 1982] grows to 30mm long and feeds on Anchinoe fictitius

Millen & Gosliner (1985) say the situation is very confused and I can only agree. So some advice from local experts would be welcome.

• Millen, S.V. & Gosliner, T.M. (1985) Four new species of dorid nudibranchs belonging to the genus Aldisa (Mollusca: Opisthobranchia), with a revision of the genus. Zoological Journal of the Linnean Society, 84: 195-233.

Best wishes,
Bill Rudman

Rudman, W.B., 2001 (Mar 30). Comment on Aldisa? from the Canary Islands by Erwin Koehler. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/4049

Factsheet

Aldisa smaragdina

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