Concavodonta

Concavodonta is a small bivalve which was first described in 1972 by Claude Babin and Michel Melou. The type species for the genus, Concavodonta ponderata, has been found in Middle to late Ordovician, Caradoc epoch sediments of Europe. The species was first described in 1881 by Joachim Barrande as Nucula ponderata. The species has been found in three Bohemian formations, the Bohdalec, Vinice, and Zahorany. The overall shape of C. ovalis shells, oval, is the base for the etymology of the specific name. The shells have an umbo positioned subcentrally on the posterior edge of the shell and nine to ten teeth in the hinge structure. Concavodonta ovalis ranges in shell length from and has a height between . ==References==