Ceratosoma magnifica trailing

January 10, 2002
From: Ákos Lumnitzer

Hi Bill,
Hope you had a great 2001 and look forward to an even better 2002.

Just letting you know, I was out at Shark Point this morning dive [north side of Clovelly Bay, Sydney, Australia] yesterday [5 January 2002] and observed twoCeratosoma magnifica together in the same manner as Risbecia tryoni would tail-gate one another. There was also a third specimen about 30cm away. Here is a still from George Evatt's video recording.

The slugs were on the same rock as they have been for the last three years, but now the grey sponge is ALL gone. Maybe the nudies ate it all? I am unsure as there was about a section of sponge measuring 150mm by 250mm.

Isn't tail-gating a characteristic of the Risbecia clan only (R. tryoni to be precise) or do other nudies behave in a similar way.

Ákos Lumnitzer


Lumnitzer, A., 2002 (Jan 10) Ceratosoma magnifica trailing. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5907

Note added 30 April 2007: Until now on the Forum this species has been considered a form of C. sinuata [see message #19854]. It is now recognised as C. flavicostata.

Dear Akos,
An interesting observation. This 'trailing' behaviour is indeed a charcteristic of all species of Risbecia but it appears that some other sea slugs also do the same thing. If you use the SEARCH for 'trailing' on the Forum you will get a list of examples which have been reported here. I think you mentioned in an earlier message that you thought you had seen this pecies 'trailing'. I'm glad to see a photo of it.
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Jan 10). Comment on Ceratosoma magnifica trailing by Ákos Lumnitzer. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5907

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