(Leske, 1778)
Groove Burrowing Urchin
Echinoidea
Spatangoida
Brissidae
Brissopsis elongata
Heart Urchin
Meoma ventricosa
Large Heart Urchin
Plagiobrissus grandis
Image: © Stefan Greif (CC-BY-NC) · iNaturalist (CC-BY-NC) · source