July 30, 2003
From: Jun Imamoto
Thank you for your comment. I attach an additional image. The white thing may be a shell.
26 Jul 2003
Manazuru-coast Sagami Bay, Japan
size about: 4mm
depth: 0.3m (Intertidal)
firstname.lastname@example.orgImamoto. J., 2003 (Jul 30) Re: Metaruncina setoensis - external shell?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/10594
Thanks for the photo. It certainly looks like a shell. We really need to know whether the 'shell' is covered by the skin or exposed. If it is exposed then either the shell of Metaruncina setoensis is sometimes internal and sometimes external, or else this animal is not Metaruncina setoensis but perhaps a species of Ildica, the genus Bergh described for Ildica nana, an animal with an external shell. The shape of the radular teeth should certainly be one way of determining whether it is M. setoensis.