Halgerda cf willeyi
Hachijo Island, Japan. Upper 60mm long, Lower 50mm. PHOTOS: Rie Nakano.
This differs from Halgerda willeyi in having a yellow border to the mantle. Apparently variable in colour with yellow lines on mantle sometimes being absent.
See Rie Nakano's message below.
• Eliot, C.N.E. (1904) On some nudibranchs from East Africa and Zanzibar. Part III. Dorididae Cryptobranchiatae, I. Proceedings of the Zoological Society of London, 1903(2): 354-385, Pls. 32-34.
Rudman, W.B., 1999 (November 24) Halgerda cf willeyi Eliot, 1904. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/halgsp3
March 12, 2002
From: Rie Nakano
Two years ago I sent you a message with images of Halgerda cf. willeyi.
Your question; Are both colour forms common?
Yes, both color forms are common in Hachijo, and I haven't been able to see the animal without the yellow border. I checked late last year. Mr.Shoichi Kato says there are many individuals at 30-40m depth.
email@example.comNakano, R., 2002 (Mar 12) Halgerda cf. willeyi from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5506
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.