August 22, 2001
From: Nishina Masayoshi
I think this is Ceratosoma bicolor?
Date:1 July 2001
Location: Yaene, Hachijo Island, Japan
Frequency on Hachijo: uncommon
firstname.lastname@example.orgNishina, M., 2001 (Aug 22) Ceratosoma bicolor? from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5061
Yes this is Baba's Ceratosoma bicolor. As I discuss at the top of the page, when I revised this genus, I considered this to be a colour form of Ceratosoma trilobatum and I am still uncertain about whether it is a distinct species. Species of Ceratosoma seem to be quite variable in colour pattern so it is hard to decide whether using colour differences to define species of Ceratosoma is appropriate. One point in its favour is that I don't know of this colour form occurring anywhere but in Japanese waters. Like many nudibranch questions, I think we will have to wait until we get some more information.