March 19, 2002
From: Nishina Masayoshi
I think that this is Volvatella ayakii Hamatani, 1972.
Date: 3 March, 2002
Location: Hachijo Island, Japan
Masayoshi, N., 2002 (Mar 19) Is this Volvatella ayakii ?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6373
I think this is probably Hamatani's Volvatella ayakii. He said the main distinguishing features were the shape of the shell, the external appearance of the living animal and the radular morphology. Your animals are white, and have a constriction in the shell, as described by Hamatani. However most species of Volvatella were described from the shell alone, which is a pretty unreliable character when the shell is only feebly calcified and often becomes mishapen when dried. My feeling is that we might as well call it Volvatella ayakii until the other, and much earlier, names are sorted out.
It would be interesting to know the name of the Caulerpa you found this species on. Hamatani's specimens were found on Caulerpa brachypus.
Re: Range extension for Volvatella ayakii
From: Julie Marshall, September 22, 2005
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