True bugs drink through a syringe built from jaw parts
Hemiptera—more than eighty thousand named species from cicadas to bed bugs—share piercing-sucking mouthparts, not the chewing jaws of beetles or flies. Entomologists reserve "bug" for this order or its Heteroptera branch; lovebugs are flies and ladybugs are beetles wearing borrowed names.
The Greek half-wing name fits Heteroptera whose forewings are leathery at the base and membranous at the tip—hemelytra—while Sternorrhyncha and Auchenorrhyncha keep fully membranous fronts. A rostrum sheaths stylets that inject saliva and suck fluids via muscular pumps; enzymes begin digestion outside the body. Most tap plant sap; others hunt insects or draw blood. Sizes span about 1 millimetre to 15 centimetres. They are hemimetabolous nymphs without a pupal stage, though some male scale insects blur that rule. Aphids can birth clonal daughters live and explode in numbers when conditions favour.
Fossils reach the Carboniferous; Permian Archescytinidae sit near auchenorrhynchan roots, with planthoppers, cicadomorphs, and early sternorrhynchans following, aphids and coccoids in the Triassic, and Heteroptera likewise. Four suborders—Heteroptera, Sternorrhyncha, Auchenorrhyncha, Coleorrhyncha—replaced the old Homoptera split. Cicada males click abdominal tymbals louder than any other insect; aquatic corixids and backswimmers stridulate with tibial combs. Pond skaters walk on surface tension; Microvelia can surf on surfactant Marangoni flows at up to 17 centimetres per second—twice their walking pace—and Halobates sea skaters are among the only truly marine insects.
Humans meet them as crop pests, Chagas-carrying kissing bugs, dye sources such as cochineal and carmine, shellac producers, biocontrol agents, and Iliad-era food. Sister to thrips within Paraneoptera, they outnumber other incomplete-metamorphosis orders even while holometabolous beetles and flies still lead overall diversity. From rooftop cicada song to freshwater giant water bugs, the shared syringe mouth is the clade's signature.
Source: Hemiptera
