Goniobranchus geometricus

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Goniobranchus geometricus
Chromodoris geometrica.jpg
Goniobranchus geometricus
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Heterobranchia
clade Euthyneura
clade Nudipleura
clade Nudibranchia
Superfamily: Doridoidea
Family: Chromodorididae
Genus: Goniobranchus
Species: G. geometricus
Binomial name
Goniobranchus geometricus
( Risbec, 1928)

Chromodoris geometrica Risbec, 1928 (basionym)

Goniobranchus geometricus is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.[1][2]

Goniobranchus geometricus


This species is found throughout the Indian Ocean as well as the Western Pacific Ocean from the intertidal down to 30m.[3][4]


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.[4] It is very similar to Goniobranchus conchyliatus but has green-grey rhinophores and gills whilst G. conchyliatus has red ones.[3]


This animal feeds on the sponge Chelonaplysilla violacea.[5]


  1. ^ a b Bouchet, P. (2012). Goniobranchus geometricus. Accessed through: World Register of Marine Species on 2012-05-03
  2. ^ Johnson 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
  3. ^ a b Rudman, W.B., 1999 (January 15) Chromodoris geometrica Risbec, 1928. [In] Sea Slug Forum. Australian Museum, Sydney.
  4. ^ a b King, D. & Fraser, V. 2001. More Reef Fishes and Nudibranchs Struik, Cape Town. ISBN 1-86872-686-X
  5. ^ 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

Further reading[edit]

  • Debelius, H. & Kuiter, R.H. (2007) Nudibranchs of the world. ConchBooks, Frankfurt, 360 pp. ISBN 978-3-939767-06-0 page(s): 164
  • Gosliner, 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