Pterygoid bone is absent. Internal carotid foramina are absent from parasphenoid bones. The angular bone is separated from the mandible. The columella and operculum appear as separate ear bones detached from the otic capsule in some species, whereas others lack the operculum. Replacement of vomerine teeth proceeds from the posterior of the vomer.
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. The recessus amphibiorum is oriented horizontally in the inner ear. The otic sac is bulbar and unvascularized. The amphibian periotic canal lacks fibrous connective tissue.