lingually from the dentary tooth row (i.e. towards the tongue), the upper surface of the mandible has five plate-like bones: a parasymphyseal plate at the chin, an adsymphyseal bone directly behind it, and a string of three coronoid bones directly behind the adsymphyseal. all five of these bones are covered with tiny tooth-like bumps known as denticles. larger fangs, similar to the marginal teeth, were also present on some of these bones; the first and second coronoids each have two of these fangs at their front outer corner and the parasympheseal has a single large fang in the middle. additional denticles may have been present on the dentary, which has a small number of small bumps on the outer surface of the parasymphyseal region. if these were true denticles, then this is a surprisingly "primitive" feature present in "andersonerpeton", as this feature is typically considered to have been lost very early in the evolution of tetrapods (specifically, after the evolution of "elginerpeton"). the prominent parasympheseal and coronoid fangs are also more consistent with stem-tetrapods rather than other aistopods. "andersonerpeton" does have one specific feature shared by both certain aistopods and certain stem-tetrapods: a longitudinal plate of bone directly below the coronoids, known as a "meckelian ossification".