Some individuals with thorns that may be very long and with spines terminating in thorny "crowns". Others show little more than an irregular surface with a few small stubs. The spines are usually densely covered with algae and marine growths. Test diameter up to 4 cm.
Depending on locality, the "thorniness" of the spines of this sea urchin may vary greatly. It is a difficult species to identify in the field because it is often covered with algae and other marine growth.
Subtidal areas, on coarse rubble and shellgrit-covered sea floor, to depths greater than 300 m.
Spines can puncture skin. Venom status unknown.
Native to Australia
- DSE Advisory List : Not listed
- EPBC Act 1999 : Not listed
- IUCN Red List : Not listed