Order:
Wings developing in wing pads. Mouthparts suitable for chewing. Gills digitiform and located near mouthparts, on neck, sides of thorax, or underside of base of abdomen, never on top or sides of abdomen. Two tarsal claws per leg. Only two tails (cerci).
Family:
Body long and slender, abdomen roughly cylindrical. Paraglossae and glossae about same length, suitable for shredding. Postmentum large, covering bases of maxillae. Hind wing pads more or less parallel with body axis, and typically longer than wide. First tarsal segment of each leg much longer than second. When extended, hind legs not reaching end of abdomen. Membranous pleural folds occur on no more than abdominal segments 1–7.