Goniobranchus setoensis (Baba, 1938)

Goniobranchus setoensis is similar to G. decorus and many nudibranch workers think they both are variations of the same species. Why I disagree with this is discussed under G. decorus. Of 29 specimens measured, the largest was 25mm. However, it does get a bit larger. The specimen below is feeding on a yellow sponge.

The specimen immediately below came from a Kwajalein Atoll lagoon reef under a rock in about 5m of water on 23 February 2009.

Rarely this species has an overall yellow tinge.

The young specimen below was photographed on 2 March 2009 feeding on yellow sponge on a Kwajalein Atoll lagoon reef at a depth of about 4m.

The specimen below was observed eating a gray sponge on a Kwajalein western lagoon reef on 29 August 2009. The hole in the lower center of the sponge is where the nudibranch was grazing before it was disturbed by the photographer. Note that the structure of the gray sponge is very similar to the yellow sponge the animal above is eating. They may be color forms of the same species.

Created 19 December 2005
Updated 13 April 2014

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