Bothriocidaris

Bothriocidaris (meaning best furrow or best trench) is an extinct genus of echinoid from the Ordovician. It grew to 6 inches (150 mm) in size and fed on plankton.

Bothriocidaris

Bothriocidaris (meaning best furrow or best trench) is an extinct genus of echinoid from the Ordovician. It grew to 6 inches (150 mm) in size and fed on plankton.