July 28, 1999
From: Atsushi Ono
They may be the same species. But I have never seen a middle type. Siphopteron sp.2 has no color mark, it is only white.
firstname.lastname@example.orgOno, A., 1999 (Jul 28) Another photo of Siphopteron sp. 2.. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1125
This photo also shows the absence of a siphonal ridge, suggesting it will probably turn out to be a species of Gastropteron when specimens are examined.