Re: Chelidonura amoena spawning

May 12, 2003
From: Nishina Masayoshi

Dear Bill,
Re Leanne's message. I did not know that that is the egg mass of them! Here are some photos from Japan

Hachijo Island, Japan. 30 June, 2001

Depth: 7m
Length: 40mm

Best Regards,
Nishina Masayoshi

nishina@wips.co.jp

Masayoshi, N., 2003 (May 12) Re: Chelidonura amoena spawning. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/9912

Thanks Nishina,
I am still not sure how they make the 'bubble'. You can see how they wrap the egg string around their body. I sat and watched a species of Philinopsis do the same thing one day. It was very slow. I left for 5 minutes and of course while I was gone it has somehow slipped the eggs from around its body and made the spherical, or in some cases, almost cylindrical, egg mass.

You an also see another interesting anatomical feature in one of your photos. I have posted alongside a close-up of the posterior end of the body. Chelidonura represents almost the final stage in the process by in which cephalaspidian bubble shells lost their shells and became 'complete slugs'. Unlike animals such as Atys cylindrica and Haminoea cymbalum which still have a recognisable external bubble-shaped shell, in aglajids the shell is much reduced, quite flattened, and internal. In your photo you can see the shape of the internal shell quite well. The white bit is where the flattened 'spire' of the shell sits, and the clockwise curve above this is where you will find the wide flattened body whorl.
Best wishes,
Bill Rudman

Rudman, W.B., 2003 (May 12). Comment on Re: Chelidonura amoena spawning by Nishina Masayoshi. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/9912

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