Psephophorus Californiensis Carapace Plates

Family Dermochelyidae (leatherback turtles) Psephophorus californiensis Carapace Plates. The Upper shell (or carapace) are characteristically comprised of bony segments that interlock like a jig-saw puzzle. Miocene Leatherback Turtles attained lengths of 12 feet or more. The carapace were composed of 100 or more of these plates.