A species of Holopneustes have a primary spine only at the edge of every second or third ambulactral plate. Amblypneustes ovum, as originally described, has test width approximately equal to height, and the test pores through which tube feet pass are lined up in vertical series. Closely related species are Amblypneustes pachistus, a southern Australian species with the test pores not in vertical series, and Amblypneustes grandis, a large (to 85 mm diameter) southeastern Australian species with test width greater than the height (a ratio of 1.2:1). Most species of Amblypneustes are commonly associated with macroalgal fronds but also can be found on bare reef surfaces.
Max Size: 6 cm
Sea Temperature Range: 10.2-21.2°C
Habitat: Rocky Reef
IUCN Threat Status: Not Evaluated
Occurrence: Frequent (16% 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 (3 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