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
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