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Fossil sea urchin

This sea urchin belonging to the genus Hemicidaris (Echinoidea - Carinacea - Hemicidaridae) is an extinct echinoid that inhabited the sea waters of Europe and North Africa from the Lower Jurassic (Toarcian - 182 million years ago) to Lower Cretaceous (Valanginian - 135 million years ago).

What is shown in the photos are the lateral, dorsal and ventral views (top to bottom) of the fossilized exoskeleton of one Hemicidaris sea urchin.

Reference: [1]

Photo credit: ©Stan Celestian | Locality: Novion-Porcien, the Ardennes, northern France - [Top: profile view] - [Middle: dorsal view] - [Bottom: ventral view]

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