Fossil of Cothurnocystis elizae （Image source：Dwergenpaartje， CC BY-SA 3.0 ） Age Ordovician（Tremadocian-Floian） 480-475 Ma Taxonomy Kingdom: Animalia Phylum: Echinodermata Class: Stylophora Order: Cornuta Family: Cothurnocystidae Genus: Cothurnocystis Species: Cothurnocystis elizae Morphological description Cothurnocystis elizae possesses a disproportionately large, head-like structure covered with numerous small plate-like elements. This structure bears a row of small ope