Jorunna? or Halgerda? from Mozambique

May 19, 2000
From: Vincent Tomeno

First of all, thank you for your help.

Here are a few informations about this nudibranch:
It was approximatively 30mm long, and I saw it in the South of Mozambique (Ponta de Ouro)

I took three pictures of that nudibranch, so here are the other two.

Vincent.

vtomeno@cybercable.fr

Tomeno, V., 2000 (May 19) Jorunna? or Halgerda? from Mozambique. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2415

Dear Vincent,
I'm glad you sent the other two photos as they show me a completely different aspect of the animal. I think now that it is not Jorunna sp. 2 but a species of Halgerda, probably Halgerda wasinensis. I have just prepared a page for that species so you can have a look for yourself.

The side views in your latest photos suggest that the yellow pattern is a pattern of yellow ridges and the black regions are sunken pits. I can also see a white band with black spots around the edge of the mantle which is characteristic of Halgerda wasinensis and vertainly not seen in the yellow form of Jorunna sp. 2.

The only difference between your animal and the ones I have seen and photographed in east Africa is that the ridges in your animal seem to be more rounded, and so the yellow bands are broader. However as I comment on the species page above, An animal in Gosliner's South African book has a colour similar to your animal from Mozanbique.

Can you confirm that your animal had yellow ridges?

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (May 19). Comment on Jorunna? or Halgerda? from Mozambique by Vincent Tomeno. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2415

Factsheet

Halgerda wasinensis

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