Noumea from Japan

March 15, 2000
From: Yasuhiro Shirai

Dear Bill,
I attached 2 image file in this mail.
These images are same individual. This animal's body is white. And this animal has pink gills and rhinophores.
Is this animal Noumea simplex?
Could you please identify it for me?

Location: Shima Pref. Mie, Japan (Kii Peninsula, east coast)
Length: 15mm
Water temperature: 15C
Date Feb.2000
Depth: 2m
Crawling on seaweed.

Best regards,
Yasuhiro Shirai

Shirai, Y., 2000 (Mar 15) Noumea from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Yasuhiro,
Your animal does look a bit like the white colour form of Noumea simplex but in that species the reddish-orange pigment on the gills and rhinophores is only at the tips.

Your species is quite like Noumea hongkongiensis Rudman, 1990 but the colour of the gills and rhinophores seem to be slightly different. I don't know if the difference is real or caused by different types of photographic film.

At the moment I think perhaps it is best to call it Noumea cf. hongkongiensis. Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Mar 15). Comment on Noumea from Japan by Yasuhiro Shirai. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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  1. Re: Noumea hongkongiensis?
    From: Yasuhiro Shirai, March 21, 2000

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