December 2, 1999
From: Rie Nakano
These nudibranchs are both commonly seen at Hachijo Island, Japan.
Photographed by me.
Are those Halgerda sp. both the same species or not?
UPPER: Length: 60mm, Depth:17m, water temperature: 23.6 degree
LOWER: Length: 50mm, Depth:18m (at the cave wall), water temperature: 23.6 degree
firstname.lastname@example.orgNakano, R., 1999 (Dec 2) Halgerda cf willeyi? from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1593
Thanks for these photos. Yes I think they are both the same species. There seem to be some traces of yellow on some of the ridges in the lower photo so it probably just a colour variation. You say this is quite common at Hachijo Island. Are both colour forms common?
Do you get animals without the yellow border to the mantle as well.