Goniobranchus decorus

Decorated Nudibranch
Goniobranchus decorus
Goniobranchus decorus, NSW, Australia, Photo: Tom Davis


Tropical Indo-Pacific


Translucent mantle with a white line running dorsally along body which ends in a Y shape. Another white line runs around the outside of the rhinophores along the body to below the gills. There are scattered purple dots and an orange border along the mantle edge.


Max Size: N/A cm

Sea Temperature Range: 16.2-24.6°C

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: Rare (0.7% 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