re: Dorid from France

August 23, 2000
From: Jussi Evertsen

Hi.
Archidoris pseudoargus has had many changes in the use of namegiving, as Angel Valdes has very clearly pointed out.

From northern waters Doris tuberculata is also a name mostly used by earlier workers. When Bergh (1878) created the genus Archidoris, Archidoris tuberculata was generally accepted until Eliot (1910) replaced the genus name with the older name Doris, in which he included other groups as Archidoris, Steurodoris and Platydoris. The use of Doris tuberculata therefore re-emerged until Iredale & O'Donoghue (1923) restored many of the older divisions, among them Archidoris; but this time under a new name Archidoris britannica.

From the pictures, the photo from Peter van Bragt might be Archidoris pseudoargus, but the photo from Erwin Koehler looks more like Discodoris planata. Discodoris planata can be distinguished from Archidoris pseudoargus by the stellate patterns on the mantle, and also by the more flattened shape (as he points out inthe text of the photo); but also by looking on the underside of the animal, Discodoris planata has brown spots on the mantle, and conspicous oral tentacles, both characters lacking in Archidoris pseudoargus. Not easy to see from a photo, but should not be to difficult to check out in the field by turning the animal upside down.
Yours sincerely

Jussi Evertsen
Trondhjem Biological Station
Norway
http://www.ntnu.no/~vmzotbak/nudibranchia

jussie@stud.ntnu.no

Evertsen, J., 2000 (Aug 23) re: Dorid from France. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2898

Dear Jusssi,
I wondered whether Erwin's photo was of D. planata or is it Geitodoris planata?, but there are quite a number of similar looking 'flat dorids' described from the Atlantic coast of Europe and I doubt if a single photo is going to solve the problem.

I'll leave the photo where it is at present, not because I disagree with you, but until there seems to be a consensus on its identity. Otherwise I spend too much time correcting and changing filenames and links etc.
Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Aug 23). Comment on re: Dorid from France by Jussi Evertsen. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2898

Factsheet

Geitodoris planata

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