synaptosauria

from The Century Dictionary.

• In Cope's classification (1871), a superorder of Reptilia, containing the orders Rhynchocephalia, Testudinata, and Sauropterygia.
• It is within the subclass Synapsida; in it are included forms with a single temporal bar, as distinguished from the Cotylosauria, in which-the temporal region is imperforate.