White sea urchin with purple tips to the primary spines and shell or rock fragments generally attached to the test surface. It is shaped like a flattened egg with the lower section of the test wider than the upper section. This species can be the dominant echinoid in localised areas; it is most common on broken bottom near the sand edge of the deeper New South Wales reefs.

• Max Size: 10 cm
• Sea Temperature Range: 15.3-25.6°C
• Depth: 0-100m
• Habitat: Coral Reef, Rocky Reef

• IUCN Threat Status: Not Evaluated
• Occurrence: Infrequent (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: Few (4 per transect)
  Abundance is calculated as the average number of individuals recorded per RLS transect, where present.