†family Protostegidae Cope 1873 (sea turtle)
PaleoDB taxon number: 37689
Parent taxon: Chelonioidea according to E. A. Cadena and J. F. Parham 2015
Sister taxa: Catapleura, Cheloniidae, Cimochelys, Dermochelyidae, Dermochelyoidae, Desmatochelyidae, Kimurachelys, Nichollsemys, Pandermochelys, Pliochelys, Progonosaurus, Toxochelyidae
Subtaxa: Archelon, Atlantochelys, Bouliachelys, Chelospharginae, Chelosphargis, Cratochelone, Desmatochelys, Notochelone, Pneumatoarthrus, Protostega, Protosteginae, Rhinochelys, Santanachelys, Terlinguachelys
Ecology: