Elysia viridis post-larvae?

March 25, 2004
From: Bart Teugels

Hi Bill,
I am Bart Teugels, thesis student of the VUB University (Brussels). I am doing my thesis on Elysia viridis, especially carbon and (possible) inorganic nitrogen assimilation. I've made some pictures with the microscope of larvae. I found them in my aquaria, but I am not sure if they are postlarvae from Elysia viridis. In the attachment you find the photographs. Maybe you can help me with identifying them.

For the introduction of my thesis I am looking for a classification of the order of the Sacoglossa. I've already found a lot of sources, but all of them give a different classification. Do you know where I can find the most recent or best classification of the moment?
Best regards
Bart

bateugel@vub.ac.be

Teugels, B., 2004 (Mar 25) Elysia viridis post-larvae?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/12528

Dear Bart,
You don't give an indication of size, and I am pretty sure these are photographed with a glass cover-slip on top. My gut feeling is that these are some sort of flatworm. Although in the lower right photo there appears to be some structure between the eyes I don't think it is well developed enough for the pharnyx/ buccal bulb of a sacoglossan. I think the big structure midway down the body is the ventral pharynx of a flatworm. I could be quite wrong so if anyone has a good idea can they let us know.

Concerning a good classification of the sacoglossans. At the moment, like most mollusc groups, our higher classification of the sacoglossans is in a state of change. Kathe Jensen's (1996) review is the latest major study but I am sure Kathe can let us know if there are chnages or later work we should be aware of

• Jensen, K.R. (1996) Phylogenetic systematics and classification of the Sacoglossa (Mollusca, Gastropoda, Opisthobranchia). Philosophical Transactions of the Royal Society of London, B 351: 91-122.

Best wishes
Bill Rudman

Rudman, W.B., 2004 (Mar 25). Comment on Elysia viridis post-larvae? by Bart Teugels. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/12528

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