†subfamily Protosteginae Wieland (sea turtle)
Reptilia - Testudines - Protostegidae
Parent taxon: Protostegidae according to O. W. M. Kuhn 1966
See also Weems 1988 and Zangerl 1953
Sister taxa: Archelon, Bouliachelys, Chelospharginae, Chelosphargis, Cratochelone, Desmatochelys, Notochelone, Pneumatoarthrus, Protostega, Rhinochelys, Santanachelys, Terlinguachelys
Subtaxa: Calcarichelys Microstega
Ecology: aquatic omnivore
Distribution: