order

Diadematoida

Field notes

The Diadematoida are an order of sea urchins. They are distinguished from other sea urchins by the fact that their spines are hollow, or at best have an open mesh at the core, and by the presence of 10 buccal plates around the mouth. Their tests can be either solid or flexible.

Children

Diadematidae 5 native
Lissodiadematidae

Range

United States

Greener is more native, amber more introduced; paler is less certain. How this was decided

Most observed native Diadematoida All

Native to the US, by observations.

Atlantic Long-spined Sea Urchin Diadema antillarum 3,304 observations
Blue-black Urchin Echinothrix diadema 1,003 observations
Crowned Sea Urchin Centrostephanus coronatus 423 observations
Indo-Pacific Long-spined Urchin Diadema paucispinum 51 observations