Equichlamys bifrons

Queen scallop
Equichlamys bifrons
Equichlamys bifrons, adult, Maria Island, Tasmania, Photo: Gabby Walley
Equichlamys bifrons
Equichlamys bifrons, Adelaide, SA, Photo: Graham Edgar
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Equichlamys bifrons
Equichlamys bifrons



Distinguished by its 7-9 strong rounded ribs. The colour is usually a light purple on the exterior and dark purple inside. Adults are good swimmers and generally occur in groups.


Max Size: 11 cm

Sea Temperature Range: 10.2-22.2°C

Depth: 0-36m

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 (7.7% 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: Several (7 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