species: Goniobranchus geometricus in taxonomy (Lizard Island Field Guide)
Goniobranchus geometricus

©Barbara Banks: 25 mm at Lizard Island, Queensland.

©Barbara Banks: 25 mm at Lizard Island, Queensland.

©Johanna Werminghausen: A tiny individual at Lizard Island.
Kingdom Animalia
Phylum Mollusca
Class Gastropoda
Order Nudibranchia
Family Chromodorididae
Genus Goniobranchus
Species Goniobranchus geometricus



Distinguishing features

White pustuled body with dark brown/purple geometric design, gills and rhinophores white with yellow tips tinged with green; lays orange egg ribbons (Coleman, 2008).


  • Size data has not been obtained.



©Atlas of Living Australia: Australian distribution


Feeds on sponges Chelonaplysilla violacea (Coleman, 2008).

Web resources


References that assist with identification

  • Humann, P. and N. Deloach (2010). Reef Creature Identification: Tropical Pacific New World Publications Inc., Jacksonville, Florida, USA.

Other references

  • Coleman, N. (2008). Nudibranchs Encyclopedia: Catalogue of Asia/ Indo-Pacific Sea Slugs Neville Coleman's Underwater Geographic, Springwood, Qld.
  • Waegele, H., I. Burghardt, N. Anthes, J. Evertsen, A. Klussman-Kolb and G. Brodie (2006). Species diversity of opisthobranch molluscs on Lizard Island, Great Barrier Reef, Australia, In: Contemporary studies into the systematics and evolution of opisthobranch molluscs, (Eds. G. Brodie, S. Fahey and F.E. Wells), Records of the Western Australian Museum, Supplement 69: 33-59. LIRS catalog number 1036.