Order: Diadematoidea
Kråkeboller med full radialsymmetri.
Other names: kråkeboller
Systematics :
| Kingdom | Animals (Animalia) | ||||||
| Phylum | Echinoderms (Echinodermata) | ||||||
| Klasse | Sea urchins (Echinoidea) | ||||||
| Order | Diadematoidea | ||||||
| Family | Echinidae | ||||||
| Genus | Echinus | ||||||
| Species | Langpiggsjøpiggsvin (Echinus acutus) | ||||||
| Species | Svabergsjøpiggsvin (Echinus esculentus) | ||||||
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