Description
Concavodontinae is composed of three described genera and a total of five described species. The type genus ''Concavodonta'' is composed of three species found in Bavaria, France, and Argentina. The second genus, ''Emiliodonta'', and third genus ''Hemiconcavodonta'' are both monotypic, and known only from the Argentina, Argentine precordillera. ''Concavodonta'' is a small bivalve which was first described in 1972 by Claude Babin and Michel Melou. The structuring of the shell in ''Concavodonta'' has been noted to be anomalous. While several specimens from other taxa, such as ''Praeleda, Praeleda costae'' and ''Ctenodonta'' have been found with occasional concavodont teeth, they are not typical. All genera in Concavodontinae are identified by the hinge displaying chevron shaped teeth where the concavity in the chevron faces the center of the hinge and the umbo. In both ''Concavodonta'' and ''Emiliodonta'' both the anterior and posterior rows of teeth in the shell face outwards away from the umbo. In ''Hemiconcavodonta'' only the posterior teeth are concavodont, while the anterior teeth are convexodont and thus facing away from the hinges center. Concavodontinae differs from the second subfamily in Praenuculidae, Praenuculinae, whose members are identified by tooth chevrons with concavities facing the outer edges of the shell and chevron points facing the umbo.References
Praenuculidae Prehistoric bivalves Prehistoric animal subfamilies Ordovician animals {{paleo-bivalve-stub