| Irregularia Temporal range:
| |
|---|---|
| |
| Echinocardium cordatum | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Echinoidea |
| Subclass: | Euechinoidea |
| Infraclass: | Irregularia Latreille, 1825 |
| Superorders | |
Irregularia is an extant infraclass of sea urchins that first appeared in the Lower Jurassic.