Type species of the genus,
Oligotypus tillyardi was described from lower Permian site in
Kansas and
Midco insect bed in
Oklahoma. It was small griffinfly with wing length of as preserved. Third species,
O. huangheensis was described from Pennsylvanian,
Namurian stage,
Yanghugou Formation (previously called as
Tupo Formation) near the village of Xiaheyan in
Ningxia Hui Autonomous Region,
China. It was originally described under its own genus
Sinomeganeura, but it was synonymized to
Oligotypus in 2013. The preserved segment is giving an estimated full length for the wing of approximately . Fourth species,
O. tuscaloosae was described from Early Pennsylvanian
Pottsville Formation of
Alabama. It is the largest species of
Oligotypus with preserved wing length of and estimated complete wing length of . == Description ==