Practice question

Order Diptera, true flies, mosquitoes, gnats and midges, is distinguished by presence of single pair of functional membranous forewings responsible for powered flight, while hind wings reduced to halteres, small knobbed club-shaped balancing organs vibrating rapidly providing gyroscopic feedback to thoracic ganglia for flight stability. Name di meaning two and ptera wings signifies two wings. Mouthparts vary from sponging in housefly to piercing in mosquito. Two wing pairs typify most Pterygota, scaly wings depict Lepidoptera, winglessness occurs in parasitic lice. Haltere innovation enables exceptional aerobatic maneuverability, making Diptera among most speciose orders.