Echinaster arcystatus, Flinders Is, TAS, Photo: Andrew Green
Echinaster arcystatus, Photo: Rick Stuart-Smith
Echinaster arcystatus, Chain of Bays, SA, Photo: Andrew Green
Echinaster arcystatus, Wilsons Promontory, Vic, Photo: Andrew Green
Resembles Plectaster decanus, but grows to a larger size and has a paler, less distinctive network of small spines over the upper body surface, and arms that are rounder in cross-section and flabby. It is an uncommon species that feeds mainly on encrusting sponges and other sessile animals.
Max Size: 36 cm
Sea Temperature Range: 12.4-22.2°C
Habitat: Rocky Reef
IUCN Threat Status: Not Evaluated
Occurrence: Frequent (20% 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: GJ Edgar. 2008. Australian Marine Life. New Holland, Sydney