Siphopteron brunneomarginatum

Superfamily: PHILINOIDEA
Family: Gastropteridae


Tropical western Pacific.


Cocos, Guam, 5 m; 4 mm long alive; 27 September 1970. [#c23] Photo: C. Carlson & P.J.Hoff.

Siphopteron brunneomarginatum is a uniform yellow with a dark brown parapodial border, dark brown tip to the siphon, dark brown flagellum and a dark brown line across the visceral hump. The yellow of the body is produced by closely spaced opaque yellow specks on a translucent clear background. It is superficiaily similar to S. nigromarginatum but that species is more rounded in shape, and has a much thinner marginal line of black rather than brown. S. brunneomarginatum is much more elongate in shape with the parapodia usually touching or overlapping, while in the much more inflated S. nigromarginatum the parapodia are always separated.

• Carlson, C.H. & Hoff, P.J. (1974) The Gastropteridae of Guam with descriptions of four new species (Opisthobranchia: Cephalaspidea). Publications of the Seto Marine Biological Laboratory, 21(5/6): 345-363.
• Gosliner, T.M. (1989): Revision of the Gastropteridae (Opisthobranchia: Cephalaspidea) with descriptions of a new genus and six new species. The Veliger, 32(4): 333-381.

Authorship details
Rudman, W.B., 2001 (August 1) Siphopteron brunneomarginatum [In] Sea Slug Forum. Australian Museum, Sydney. Available from

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