Ceratosoma trilobatum from Japan

November 25, 2003
From: Jason Bell

Bill,
I observed this Ceratosoma trilobatum at about 12m, Nov. 16, 2003, Hatsushima Island, Japan.

I took several pictures of the animal and started to change positions for different angle. Ceratosoma trilobatum stopped and reared up givening me chance to shoot the second picture. I have no idea why reared up, but third shoot is side view.

Jason

belljason@hotmail.com

Bell, J., 2003 (Nov 25) Ceratosoma trilobatum from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11476

Thanks Jason,
"Rearing up' like this is a fairly typical way for me nudibranchs to sense things in the water - much like a dog will raise its nose and sniff around on a windy day.

This is an interesting colour form similar to one which Baba (1949: Pl. 20 fig 74) described from Japan as a new species Ceratosoma bicolor. In that animal the red on the mantle was reduced to a broad median line running from the head to the gills. Interestingly, Baba illustrated another animal on the same page [Pl 20, fig 72] which is almost identical to your photo, except it at more white spots on the mantle than yours. he identified that as a colour form of Ceratosoma cornigerum, which is a synonym of C. trilobatum.

• Baba, K (1949) Opisthobranchia of Sagami Bay collected by His Majesty The Emperor of Japan. Iwanami Shoten, Tokyo. 194pp., 50 Pls.

Best wishes
Bill Rudman

Rudman, W.B., 2003 (Nov 25). Comment on Ceratosoma trilobatum from Japan by Jason Bell. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11476

Factsheet

Ceratosoma trilobatum

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