Quadratojugal bone is absent. Pterygoid bones are present. Internal carotid foramina are absent from parasphenoid bones. Ear bones feature fusion of the columella with the ear capsule, and a free operculum. Replacement of vomerine teeth proceeds medially.
Teeth have a distinct crown and pedicel.
Origin of the levator mandibulae anterior superficialis muscle includes the exoccipital. A basilaris complex is present in the inner ear of some species and absent from others. The recessus amphibiorum is oriented horizontally in the inner ear. The otic sac is multilobate, vascularized and filled with calcium. Fibrous connective tissue is present around the amphibian periotic canal.