Long-Spined Sea Urchins (Diadematoid Urchins) [Diadematoida]

Description

These sea urchins are famous for their long, often striking spines that can make them look like living pincushions. On dives, they’re commonly found on reefs and rocky areas, where they graze and can be surprisingly active at night.

Families

Diadem Sea Urchins

Diadematidae

Taxonomy