Stupendemys souzai sp. nov. (Pleurodira, Podocnemididae) from the Miocene-Pliocene of the Solimões Formation, Brazil

Abstract

A new species of turtle, Stupendemys souzai, is based on one incomplete humerus and additional material from several outcrops of the Solimões Formation in the state of Acre. Diagnostic features of the species include the humerus noticeably less massive than in Stupendemys geographicus, the thick curved margin of the nuchal and peripheral 1 plates, the femoroanal sulcus located very anteriorly on the xiphiplastral plate, the posterior lobe of the plastron short and broad and the centrum of cervical vertebrae relatively narrow and excavated laterally