Ceratosoma tenue

Kangaroo nudibranch
Ceratosoma tenue
Ceratosoma tenue, adult, NSW, Australia, Photo: Nicola Davis
Ceratosoma tenue
Ceratosoma tenue, juvenile, NSW, Australia, Photo: Tom Davis
Ceratosoma tenue
Ceratosoma tenue, adult, NSW, Australia, Photo: Ian Shaw
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Ceratosoma tenue
Ceratosoma tenue
Ceratosoma tenue


Tropical Indo-Pacific


Large nudibranch with 3 mantle lobes along each side of the body and a broken purple edge to the mantle. Large dorsal horn by gills. Very similar to another tropical species Ceratosoma trilobatum which has an unbroken purple line.


Max Size: 11 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 (5.3% 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: Few (2 per transect)

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

Edit by: Nicola Davis