Halgerda cf willeyi
Eliot, 1904

Order: NUDIBRANCHIA
Suborder: DORIDINA
Superfamily: EUDORIDOIDEA
Family: Dorididae

PHOTO

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.

Reference:
• 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.

Authorship details
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

Related messages


Halgerda cf. willeyi from Japan

March 12, 2002
From: Rie Nakano

Dear Dr.Rudman
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.
Sincerely,
Rie Nakano

rie@divers.ne.jp

Nakano, 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

Thanks Rie,
Bill Rudman.

Halgerda cf willeyi? from Japan

December 2, 1999
From: Rie Nakano


Dear Bill,

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

Sincerely,
Rie

rie@street.ne.jp

Nakano, 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

Dear Rie,
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.

I don't think this species has a name. It looks quite similar to Halgerda willeyi so I will call it Halgerda cf. willeyi until we have something better.

Best wishes,
Bill Rudman.

Rudman, W.B., 1999 (Dec 2). Comment on Halgerda cf willeyi? from Japan by Rie Nakano. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1593