Paracentrotus lividus
Echinus Melo the water melon urchin from Alghero Sardinia
Skeleton
Sea urchin eggs
Fossil Lovenia woodsi
Pluteus
note the tentacles (Galicia, Spain)
Sea urchin in croatia
From "On the Genesis of Species"
Pedicellariae enlarged.
Purple sea urchin
Sea urchin roe from Alghero Sardinia
Sear Urching fishing net in Alghero Sardinia
Sea urchin tracks and skeleton - intertidal zone - Khlong Yai district, Trat province, Thailand