andersonerpeton is an extinct genus of aïstopod from the bashkirian (early pennsylvanian) of nova scotia, canada. it is known from a single jaw, which shares an unusual combination of features from both other aistopods and from stem-tetrapod tetrapodomorph fish. as a result, "andersonerpeton" is significant for supporting a new classification scheme which states that aistopods evolved much earlier than previously expected. the genus contains a single species, a. longidentatum, which was previously believed to have been a species of the microsaur "hylerpeton."