Goniobranchus geometricus is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.Bouchet, P. (2012). Goniobranchus geometricus. Accessed through: World Register of Marine Species on 2012-05-03Johnson R.F. & Gosliner T.M. (2012) Traditional taxonomic groupings mask evolutionary history: A molecular phylogeny and new classification of the chromodorid nudibranchs. PLoS ONE 7(4): e33479
Distribution This species was described from New Caledonia. It is found throughout the Indian Ocean as well as the Western Pacific Ocean from the intertidal down to .Rudman, W.B., 1999 (January 15) Chromodoris geometrica Risbec, 1928. [In] Sea Slug Forum. Australian Museum, Sydney.
Description Goniobranchus geometricus is a small nudibranch which may grow to a total length of 35mm. It is variably coloured, with the ground colour ranging from a creamy brown to purple, The mantle has numerous cream-coloured bumps and has a white margin. The gills and rhinophores are white to greenish.King, D. & Fraser, V. 2001. More Reef Fishes and Nudibranchs Struik, Cape Town. It is very similar to Goniobranchus conchyliatus but has green-grey rhinophores and gills whilst G. conchyliatus has red ones.Debelius, H. & Kuiter, R.H. (2007) Nudibranchs of the world. ConchBooks, Frankfurt, 360 pp. page(s): 164Gosliner, T.M., Behrens, D.W. & Valdés, Á. (2008) Indo-Pacific Nudibranchs and seaslugs. A field guide to the world's most diverse fauna. Sea Challengers Natural History Books, Washington, 426 pp. page(s): 220
Ecology This animal feeds on the sponge Chelonaplysilla violacea.Rudman, W. B. & Bergquist, P. R. (2007) A review of feeding specificity in the sponge-feeding Chromodorididae (Nudibranchia: Mollusca). Molluscan Research, 27(2): 60-88
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