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:
Larvae generally small (less than 12 mm long), robust, and hairy. Paraglossae and glossae about same length, suitable for shredding. Hind wing pads conspicuously divergent from body axis. First tarsal segment of each leg much longer than second. When extended, hind legs reach beyond end of abdomen.