Ceratosoma amoena - feeding aggregation?

April 25, 2007
From: Ross Armstrong


Dear Bill,

Following your email asking about records of Ceratosoma amoena feeding, here is a photo Diane took of a group of Ceratosoma amoena on a sponge at the Poor Knights. Not sure if they were feeding.

Poor Knights Islands, Northland, New Zealand. South Pacific Ocean. Photographer: Diane Armstrong

Best regards
Ross Armstrong

ross@oceanwildlife.com

Armstrong, R., 2007 (Apr 25) Ceratosoma amoena - feeding aggregation?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19838

Dear Ross,
Thanks for this record. I am pretty sure this is a species of Semitaspongia which Prof. Bergquist has previously identified as this species' 'food' from both eastern Australia and northern New Zealand. Although there is no obvious sign of damage to the sponge, at least two of the animals seem to have their buccal bulbs extended. Also in this case and in others on the Forum [#9268, #9360] there are numbers of Ceratosoma on the sponge, but not mating, suggesting that they are attracted by the sponge and not necessarily by each other.
Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Apr 25). Comment on Ceratosoma amoena - feeding aggregation? by Ross Armstrong. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19838

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