Euechinoidea

Euechinoidea; Temporal range: Late Triassic – Recent PreꞒ Ꞓ O S D C P T J K Pg N
	Paracentrotus lividus
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Echinoidea
Subclass:	Euechinoidea; Bronn, 1860
Superorders
	Diadematacia; Echinacea; Gnathostomata; Atelostomata

The subclass Euechinoidea includes almost all living species of sea urchin, and fossil forms going back as far as the Triassic.

Taxonomy

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 †

gollark: What an *interesting* language breakdown.

gollark: I've read much of the Urbit stuff before, and this language seems about as insane as the rest of it.

gollark: Of course it does.

gollark: This is actually a *great* esolang, more so than lots of actual things intended as esolangs.

gollark: How do you pronounce `|=`, "pipe equals"?

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