diapsida definition

  • others:
    • A subclass of Reptilia which contains those forms with (primarily) two temporal arches, a relatively small squamosal, large quadrate, and coracoid and procoracoid early coalescing, or the procoracoid degenerate: contrasted with *Synapsida.
    • A subclass of Reptilia containing those types with (mainly) two temporal arches, a somewhat tiny squamosal, huge quadrate, and coracoid and procoracoid very early coalescing, and/or procoracoid degenerate: contrasted with *Synapsida.
  • noun:
    • found in previous classifications to incorporate all living reptiles except turtles; superseded because of the two subclasses Lepidosauria and Archosauria
    • found in former classifications to add all living reptiles except turtles; superseded because of the two subclasses Lepidosauria and Archosauria

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