Similar to Holopneustes inflatus, but the test is thicker and more stronger, with more tubercles on each plate. The colour of the test is usually dull brown/grey or dark brown (Port Phillip). It grows to a larger size than H. inflatus. Test diameter up to 8 cm.
This species is common in intertidal areas and in shallow waters.
Prefers environments with kelp.
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