These approximately 20mm urchins are usually seen under rocks or in rubble on lagoon, pinnacle or seaward reefs. There are apparently several species in the genus and it may be difficult to tell them apart, so the exact ID remains in doubt.
Underside of the above specimen.
This species often holds rocks and other debris over its top to help disguise its shape.
Created 16 June 2018
Updated 5 February 2024