Irregularia

Irregularia
Temporal range:
Echinocardium cordatum
Scientific classification
Kingdom: Animalia
Phylum: Echinodermata
Class: Echinoidea
Subclass: Euechinoidea
Infraclass: Irregularia
Latreille, 1825
Superorders

Atelostomata
Neognathostomata

Irregularia is an extant infraclass of sea urchins that first appeared in the Lower Jurassic.

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