Order: Spatangoida
Systematics :
| Kingdom | Animals (Animalia) | ||||||
| Phylum | Echinoderms (Echinodermata) | ||||||
| Klasse | Sea urchins (Echinoidea) | ||||||
| Order | Spatangoida | ||||||
| Family | Loveniidae | ||||||
| Genus | Echinocardium | ||||||
| Species | Sandsjømus (Echinocardium cordatum) | ||||||
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Responsible editor: Doris Jorde