Wikipedia
Cothurnocystis
Cothurnocystis is a genus of small, enigmatic echinoderms that lived during the Ordovician. Individual animals had a flat, boot-shaped body and a thin, rod-shaped appendage that may be a stem, or analogous to a foot or a tail. Fossils of Cothurnocystis species have been found in Nevada, Scotland, Czech Republic, France and Morocco.