Chromodoris westraliensis

Western Australian chromodorid | West Australian nudibranch

Chromodoris westraliensis, Perth, WA, Photo: Tom Davis

Chromodoris westraliensis, Rottnest Is, WA, Photo: Andrew Green

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Distribution

Localised, Temperate Australasia

Description

The colour pattern varies little throughout the species’ range and is immediately recognisable because of two pale blue patches prominent on the back, red gills and rhinophores, and yellow and black stripes along the margin. Very common on reeds just below low-tide level.

Information

Max Size: 6 cm

Sea Temperature Range: 17.1-23.6°C

Depth: 0-18m

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: Common (38.4% 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: Few (2 per transect)

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

Edit by: GJ Edgar. 2008. Australian Marine Life. New Holland, Sydney

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Further Information

Atlas of Living Australia IUCN Red List