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:
The body is small (~1/4 inch) and slender and without gills; the hind legs do not reach the end of the abdomen; the wing pads are about as long as wide; the abdomen is a little wider in the middle than at it anterior base.