Order: Echinoida
Systematics :
| Kingdom | Animals (Animalia) | ||||||
| Phylum | Echinoderms (Echinodermata) | ||||||
| Klasse | Sea urchins (Echinoidea) | ||||||
| Order | Echinoida | ||||||
| Family | Parechinidae | ||||||
| Genus | Psammechinus | ||||||
| Species | Grønnsjøpiggsvin (Psammechinus miliaris) | ||||||
| Family | Strongylocentrotidae | ||||||
| Genus | Strongylocentrotus | ||||||
| Species | Drøbaksjøpiggsvin (Strongylocentrotus droebachiensis) | ||||||
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