1.9" Starfish (Petraster?) & Edrioasteroids - Ordovician

This is a 1.9" wide, Ordovician aged starfish of the genus Petraster. It comes from the Tioririne Formation near Blekus, Morocco.

There are also a couple of unidentified Edrioasteroid fossils, on small one on the front of the plate and one on the back. Edrioasteroids are an extinct class of echinoderms that lived from the Ediacaran until the Permian, about 300 million years ago. The living animal would have resembled a pentamerously symmetrical disc or cushion.