Re: Photo of a living 'Berthella' sideralis

January 15, 2007
From: Jussi Evertsen

Concerning message #19147:

Hi Bill,
I have gone back to the preserved material, and taken a closer look at the animals by removing the shell from one. What we have here is a shell that is coevered by a periostracum, even over the protoconch. The shell is thin and fragile and even flexible, and you can clearly see the internal structures through it. I guess this thin and transparent periostracum could make the animal look like it has a dorsal mantle.

Locality: Rundholmen, 28 m, Bud, Norway, 21 May 2004, hard bottom. Length: 20 mm. (material is the same as the photos of the living specimens, from Rundholmen). Photographer: Anita Kaltenborn.

Attached is a photo of two specimens, one to the lower left with the shell attached, the top animal without shell where the shell is to the right.

This animal fits very well with Velutina plicatilis (Muller, 1776) as described in Fretter & Graham (1981). A small step for human kind, but a great step for us, and now we have tidied up this animal.

Jussi

jussi.evertsen@bio.ntnu.no

Evertsen, J., 2007 (Jan 15) Re: Photo of a living 'Berthella' sideralis. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19220

Dear Jussi,
Thanks for the follow-up. Although it's not Berthella sideralis, it is nice to have solved the problem of its identity.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Jan 15). Comment on Re: Photo of a living 'Berthella' sideralis by Jussi Evertsen. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19220

Factsheet

Velutinidae - are they sea slugs?

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