Is this Siphopteron quadrispinosum?

May 27, 2002
From: Nishina Masayoshi

Note added 15 January 2004: This is considered to be Siphopteron quadrispinosum. See message.

Dear Bill,

My friend Moguricyo sent me these photos. I am sure that this animal belongs to
Siphopteron, but I have no idea what species. It might be Siphopteron quadrispinosum?

Date: 20 May, 2002
Location: Hachijo Island Japan
Length: 5mm
Found and Photo by Moguricyo

Best Regards,
Nishina Masayoshi

Masayoshi, N., 2002 (May 27) Is this Siphopteron quadrispinosum?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Nishina,
It certainly has similarities in colour to Siphopteron quadrispinosum but at present I wouldn't like to say just how much colour variation we should expect to occur in some of these yellow species of Siphopteron and Gastropteron. In this case, I think the colour pattern is so different from existing species that it is probably something unnamed. It is possible that the red lines could darken to brown or even black, but even then I don't know of a species with such markings. I think to be safe I will call it Siphopteron sp. 3.
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (May 27). Comment on Is this Siphopteron quadrispinosum? by Nishina Masayoshi. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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