Edrioaster bigsbyi

Edrioasteroid
Ordovician
Verulam Formation
Brechin, Ontario, Canada
A spectacular plate that in addition to the Edrioaster has a ventral view of the edrio Thresherodiscus , the undescribed crinoid Cleiocrinus that goes right down to the holdfast and also a partial paracrinoid.

Size: 19 cm across the plate.
Edrioaster