This is a tooth from a member of the Tetrapodomorha, known as Hyneria. The fish looked much like Eusthenopteron that reached some 2.5 meters in length. The teeth of the premaxilla were fanglike as seen here which allowed them to seize and hold prey. Most specimens known were found near the village of Hyner in Pennsylvania, hence the genus name. The Late Devonian Famennian Stage is bounded on both the beginning and the end by extinction events with the former being the greater in magnitude.