Aeolidiella alderi

March 17, 2001
From: Jean-Pierre Bielecki

Dear Bill
As promised at the time of my last mail here are two specimens of Aeolidiella, the pale coloured one (Lower Left photos) is a typical Aeolidiella alderi, it is in conformity with the description of Bernard Picton. You will notice that it is missing an oral tentacle. I am not sure if the second animal (Upper & Lower Right photos) is a colour variety or of another species (A. glauca or A. sanguinea?).

LOWER LEFT: Dive site: îles de Lérins, Cannes, south of France, 01/10/00, 9m, Size: 8 mm, Water temperature: 21°C. UPPER & LOWER RIGHT: Dive site: Etang de Thau, Sète, south of France, 12/12/00, 6m, Size: 28 mm, Water temperature : 12°C.

Bielecki, J-P., 2001 (Mar 17) Aeolidiella alderi. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Hi Bill & Jean-Pierre,
Yes, I think these are both A. alderi. The small white one shows the elongate cnidosacs well, these are less obvious in the brown one, but the rather ragged looking cerata are more typical of A. alderi than the other Aeolidiella species here.
Bernard Picton

Picton, B.E., 2001 (Mar 17). Comment on Aeolidiella alderi by Jean-Pierre Bielecki. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Aeolidiella alderi

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