Sea urchins

Atlantic Purple Sea Urchin

Atlantic Purple Sea Urchin

Paracentrotus lividus

Black sea urchin

Black sea urchin

Arbacia lixula

Violet Sea Urchin

Violet Sea Urchin

Sphaerechinus granularis

Sea Potato

Sea Potato

Echinocardium cordatum

Elegant Sea Urchin

Elegant Sea Urchin

Arbaciella elegans

Long-Spine Slate Pen Sea Urchin

Long-Spine Slate Pen Sea Urchin

Cidaris cidaris

Purple Heart Urchin

Purple Heart Urchin

Spatangus purpureus