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 (1/4–1 inch), stocky, with tapered and pointed gills that are partly hidden by the large, overlapping thoracic plates, giving this stonefly a cockroach appearance from dorsal view.