Family: Fibulariide
En art finnes langs norskekysten.
Systematics :
| Kingdom | Animals (Animalia) | ||||||
| Phylum | Echinoderms (Echinodermata) | ||||||
| Klasse | Sea urchins (Echinoidea) | ||||||
| Order | Clypeasteroidea | ||||||
| Family | Fibulariide | ||||||
| Genus | Echinocyamus | ||||||
| Species | Dvergsjømus (Echinocyamus pusillus) | ||||||
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