Euechinoidea
The subclass Euechinoidea includes almost all living species of sea urchin, and fossil forms going back as far as the Triassic.Taxonomy
List of orders according to World Register of Marine Species :
- Infra-classis Acroechinoidea
- * Order Aspidodiadematoida
- * Order Diadematoida
- * Order Micropygoida
- * Order Pedinoida
- Infra-classis Carinacea
- * Super-order Calycina
- ** Order Phymosomatoida †
- ** Order Salenioida
- * Super-order Echinacea
- ** Order Arbacioida
- ** Order Camarodonta
- ** Order Stomopneustoida
- Order Echinothurioida
- Infra-classis Irregularia
- * Super-order Atelostomata
- ** Order Holasteroida
- ** Order Spatangoida
- * Order Echinoneoida
- * Order Holectypoida †
- * Super-order Neognathostomata
- ** Order Cassiduloida
- ** Order Clypeasteroida
- ** Order Echinolampadoida
- ** Order Nucleolitidae †
