PaleoDB taxon number: 366379
Full reference: O. P. Hay. 1908. The fossil turtles of North America. Carnegie Institution of Washington Publication 75:1-568
Belongs to Emydidae according to E. Vlachos 2018
Sister taxa: Batagurinae, Callagur, Chelonemys, Chelopus, Chinemys, Chrysemys, Chrysemys inflata, Chrysemys isoni, Chrysemys limnodytes, Cistudo, Clemmys hutchensorum, Clemmys saxea, Deirochelyinae, Deirochelys, Emydinae, Emydoidea, Emydoidea hutchisoni, Emys, Epiemys, Glyptemys, Graptemys, Grayemys, Hardella, Heosemys, Hieremys, Hybemys, Lyssemys, Malacoclemmys, Malayemys, Melanochelys, Morenia, Notochelys, Palaeotheca, Polyechmatemys, Pseudemys, Pseudemys bisornatus, Pseudemys caelata, Pseudemys extincta, Pseudemys hillii, Pseudochrysemys, Pseudograptemys, Pyxidea, Sakya, Senryuemys, Shansiemys, Sharemys, Terrapene, Trachemys
Type specimen: USNM 16679 (holotype), a partial shell (nuchal plate). Its type locality is Peace River 3A, which is in a Pleistocene terrestrial siliciclastic in Florida.