The Big-headed Turtle (Platysternon megacephalum) is a species of turtle in the subfamily Platysterninae. Previously considered a distinct family placed on occasion in the now-defunct "Kinosternoidea", it was later moved to the Emydidae. With the Geoemydidae being split off from these, it seems wisest to reinstate, at least for the time being, the Platysternidae. This, as well as the subfamily and the genus Platysternon, are monotypic.
