Part I. "Pelycosaur"-grade Synapsids 1. Introduction Robert R. Reisz 2. New Information on the Basal Pelycosaurian-grade Synapsid Oedaleops Stuart S. Sumida, Valerie Pelletier, and David S Berman 3. Was Ophiacodon (Synapsida: Eupelycosauria) a Swimmer? A Test Using Vertebral Dimensions Ryan N. Felice and Kenneth D. Angielczyk 4. Postcranial Description and Reconstruction...