the preserved portion of the jaw was smooth, shallow and relatively wide, curving upwards at the parasymphyseal (chin) region. the main bone of the jaw, the dentary, possessed a single row of long, curved teeth, known as marginal teeth. these teeth were weakly attached to the underlying bone, which allows them to fold backwards. this ability is also seen in certain snakes as well as oestocephalid aistopods, betraying "andersonerpeton"'s aistopod affinities. unusually, the teeth also have a maze-like internal structure, formally known as labyrinthine infolding. this type of structure is known in large "labyrinthodont" tetrapods and their tetrapodomorph ancestors, but unknown in any other aistopod.