Agnewia tritoniformis

Murex shell
Agnewia tritoniformis
Agnewia tritoniformis, Jervis Bay, NSW, Photo: Graham Edgar
Agnewia tritoniformis
Agnewia tritoniformis, Orford, TAS, Photo: Graham Edgar
Agnewia tritoniformis
Agnewia tritoniformis, Port Stephens, NSW, Photo: Tom Davis
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Agnewia tritoniformis
Agnewia tritoniformis
Agnewia tritoniformis


Temperate Australasia


Grey shell with ribs and ridges forming a cross-hatched sculpture across the surface and dark depressions between. The species can occur in high abundances under individual rocks.


Max Size: 3 cm

Sea Temperature Range: 12.4-24.6°C

Depth: 0-25m

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 (20.7% 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 (6 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