Three new species of Periploma (Bivalvia, Periplomatidae) from the Panamic Province Author Valentich-Scott, Paul Author Coan, Eugene V. text Zootaxa 2010 2673 65 68 journal article 10.5281/zenodo.276468 63d57a27-cf0e-441d-9600-8a759f96e0cb 1175-5326 276468 Genus Periploma Schumacher, 1817 Periploma Schumacher, 1817 . Type species (by monotypy): Periploma inaequivalvis Schumacher, 1817 , = Corbula margaritacea Lamarck, 1801 . Recent, Florida. Shell ovate to subquadrate, thin, inequivalve; right valve more inflated, overlapping left; anterior end rounded; posterior end truncate; umbones opisthogyrate, with radial fissure; sculpture granulate or pustulate; hinge plate narrow, with large chondrophore in each valve supported by rib or clavicle; lithodesma usually present; interior subnacreous. The genus, known from the Cretaceous, is primarily temperate and tropical in distribution. The name is derived from the Greek peri– , from, and –plyma , dirty water; the gender is neuter.