Carinacea
The infraclassis Carinacea includes most living species of regular sea urchin, and fossil forms going back as far as the Triassic.
Taxonomy
List of orders according to World [Register of Marine Species]:- Superorder Calycina
- * Order Phymosomatoida†
- Superorder Echinacea
- * Order Arbacioida
- * Order Camarodonta
- * Order Salenioida
- * Order Stomopneustoida
- * Family Glyphopneustidae Smith & Wright, 1993†
- Family Hemicidaridae Wright, 1857†
- Family Orthopsidae Duncan, 1889†
- Family Pseudodiadematidae Pomel, 1883†