Goniobranchus geminus

Gem nudibranch | Chromodoris geminus
Goniobranchus geminus
Goniobranchus geminus, Bali, Indonesia, Photo: Nicola Davis
Goniobranchus geminus
Goniobranchus geminus, Tanzania, Photo: Rick Stuart-Smith
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Goniobranchus geminus
Goniobranchus geminus


Mediterranean, Tropical Eastern Pacific, Tropical Indo-Pacific


Characterised by the four bands around the edge of the mantle - the outermost is white, then translucent greyish purple, then white, then yellow.


Max Size: N/A cm

Sea Temperature Range: 25.9-29.8°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 (0.3% 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