Ceratosoma amoena - mating aggregation

April 26, 2007
From: Floor Anthoni


Hi Bill,

No sign of feeding here, but thought you might be interested.

Locality: Parengarenga Harbour, Northland, New Zealand. Harbour entrance at night. 5 Jan 2004. Photographer: Floor Anthoni

Best wishes,
Dr J Floor Anthoni
http://www.seafriends.org.nz/
floor[at]seafriends.org.nz

Anthoni, J.F., 2007 (Apr 26) Ceratosoma amoena - mating aggregation. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19843

Dear Floor,
I suspect their food is nearby, but they certainly are more interested in each other than in eating at this moment.

When I reviewed the anatomy of this species many years ago, its reproductive system and gut were very similar to the tropical species of Ceratosoma, although it lacked the characteristic curved dorsal horn found in species such as Ceratosoma trilobatum. One other feature it had, which also linked it to Ceratosoma, was the concentration of large mantle glands at the rear of the mantle. These glands can't be seen in your photos, but in the close-up alongside you can see the small glands, it also has, scattered around the rest of the mantle edge as small white specks in the large animal on the left.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Apr 26). Comment on Ceratosoma amoena - mating aggregation by Floor Anthoni. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19843

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