Sailback Roster -- Fig. 1. A brief survey of the sailbacks of prehistory. Permian sailbacks, the sphenacodontids: (1) Dimetrodon, (2) Sphenacodon, (3) Secodontosaurus, and (4) Ctenospondylus. The edaphosaurids: (5) Edaphosaurus, (6) Ianthasaurus, (7) Echinerpeton, (8) Lupeosaurus. The temnospondyl: (9) Platyhystrix. Triassic sailbacks, the rauisuchians: (1) Arizonasaurus, (2) Ctenosauriscus, (3) Lotosaurus, and (4) Xilousuchus. Cretaceous sailbacks, the theropods: Spinosaurus (1), Suchomimus (2)
