Goniobranchus geometricus

Geometric nudibranch | Chromodoris geometrica
Goniobranchus geometricus
Goniobranchus geometricus, NSW, Australia, Photo: Nicola Davis
Goniobranchus geometricus
Goniobranchus geometricus, Bali, Indonesia, Photo: Ian Shaw
Goniobranchus geometricus
Goniobranchus geometricus, Lord Howe Is, Australia, Photo: Ian Shaw
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Goniobranchus geometricus
Goniobranchus geometricus
Goniobranchus geometricus


Tropical Indo-Pacific


White body with nodules and black lines. Rhinophores are yellow/green, the edge and underside of the mantle is purple. The mantle skirt waves up and down as the animal crawls along.


Max Size: 4 cm

Sea Temperature Range: N/A

Depth: N/A

Habitat Generalization Index: N/A

Also referred to as the SGI (Species Generalisation Index), this describes the habitat niche breadth of the species. Species with values less than 15 are found in a relatively narrow range of reef habitat types (specialists), while those over 25 may be found on most hard substrates within their range (generalists). Learn more here.

Conservation and Rarity

IUCN Status: Not Evaluated

Occurrence: Infrequent (1.4% of sites)

Occurrence describes how often the species is found on surveys within its distribution. It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed

Abundance: Solitary (1 per transect)

Abundance is calculated as the average number of individuals recorded per RLS transect, where present.

Edit by: Nicola Davis