Genus Clypeaster includes irregular sea urchins with a bilateral symmetry (Bilateria). They have a rounded pentagonal outline. The anus of these large burrowing cake urchins has migrated from the apical disc to the oral side, on the lower surface. Besides this development, the mouth has moved in the centre of the base and the body has flattened. These changes accompany a change in lifestyle, as by day they live partially or completely buried in sand in shallow waters and emerge at night to feed on the sediment.
Clypeaster Insignis sea urchin from the Miocene of Almería Spain. No restorations. 100% natural. The measurements are 15 x 7.5 cm It has depredation marks.
- Nom scientifique
- Clypeaster Insignis
- Période géologique
- NÉOGÈNE-Miocène, Tortonien (7,24-11,63 millions d’années)
- Bon état
- 7.5×15 cm