September 22, 2005
From: Julie Marshall
Cobcerning your comments [#14787]: I agree identification in this group is very difficult but the distinct large white patches which always seem to be present on Volvatella angeliniana (see my accompanying message) seem to distinguish it from the animals I have called V. ayakii especially as both groups of animals were of the same size.
Ono's picture of V. ayakii in his recent book on Opisthobranchs from the Ryukyu Islands (p. 44, no. 83) seems to have faint white dots on the mantle. He also illustrates V. angeliniana (no. 82). I expect a number of more specimens of both species need to be collected to make a definite decision.
email@example.comMarshall, J.G., 2005 (Sep 22) Re: Range extension for Volvatella ayakii. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14817
I wasn't really trying to say your animals were V. angeliniana, it was your mention of white spots which made me think of that species. Looking at Hamantani's orignal photos, the white spots don't seem to be as uniformly arranged as in your animals, they seem to be restricted to two broad bands. That's not to say your animal isn't V. ayakii, it's just I am finding it harder and harder to find good characters to separate quite a few of these Volvatella species.
Your mention of Opisthobranchs from the Ryukyu Islands reminds me that now I can get back into the book review section of the Forum I should add a review I prepared some time ago.
Range extension for Volvatella ayakii
From: Julie Marshall, September 21, 2005
RE: sacoglossan food
From: Nishina Masayoshi, July 31, 2002
Volvatella ayakii - dwarf males
From: Nishina Masayoshi, July 21, 2002
Re: Algae in Japan
From: Nishina Masayoshi, March 28, 2002
Re: Caulerpa ambigua - sacoglossan food
From: Cynthia Trowbridge, March 27, 2002
Caulerpa ambigua - sacoglossan food
From: Nishina Masayoshi, March 23, 2002
Is this Volvatella ayakii ?
From: Nishina Masayoshi, March 19, 2002