Micraster coranginum

Micraster coranginum is a large irregular urchin (echinoid) from the Cretaceous (Turonian) aged cliffs near Ault, France. Often these are referred to as Heart Urchins due to their shape when viewed from above.

Adapical surface (top)

Anterior (front)

Side profile

Posterior (Rear)

Adoral surface (underside or bottom)

My thanks go out to Gery for sending me this fossil.