Hemiptera

Linnaeus, 1758

true bugs, hoppers, aphids, cicadas, leafhoppers, planthoppers, shield bugs, bed bugs, assassin bugs

Suborder Guides

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is an order of insects comprising 50,000–95,000+ , commonly known as true bugs. The order includes , aphids, , planthoppers, , , and assassin bugs. Members range from 1 mm to 15 cm in size and share a defining arrangement of forming a rostrum or "beak." The order is divided into four suborders: Heteroptera (true bugs), Sternorrhyncha (aphids, scale insects, whiteflies), Auchenorrhyncha (cicadas, hoppers), and (moss ). Historically, Sternorrhyncha and Auchenorrhyncha were grouped as "," but molecular studies demonstrated paraphyly, leading to current classification under Hemiptera.

Clastoptera achatina by (c) skitterbug, some rights reserved (CC BY), uploaded by skitterbug. Used under a CC-BY license.Clastopteridae by no rights reserved, uploaded by Jesse Rorabaugh. Used under a CC0 license.Clastoptera mineralis by no rights reserved, uploaded by Emily Langdon-Lassagne. Used under a CC0 license.

Pronunciation

How to pronounce Hemiptera: /hɛˈmɪptərə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

is distinguished from other insect orders by modified into a rostrum: and form stylets sheathed within a modified . The rostrum is typically folded under the body when not in use. Forewings vary by suborder: entirely membranous in Sternorrhyncha and Auchenorrhyncha, or partially hardened () with leathery basal portion and membranous portion in most Heteroptera. typically have 4–5 segments; have 2–3 segments. Hindwings, when present, are fully membranous and usually shorter than forewings.

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Habitat

occupies diverse across terrestrial and freshwater . Most are terrestrial, inhabiting forests, grasslands, agricultural fields, and urban environments. Freshwater-adapted include Corixidae (water boatmen), Notonectidae (backswimmers), Nepidae (water scorpions), Gerridae (pond skaters), and Belostomatidae (giant water bugs). Some species, such as sea skaters in Halobates (Gerridae), are the only truly marine insects. Arboreal species inhabit tree ; Sternorrhyncha females are often sedentary or , attached to plants by feeding stylets.

Distribution

distribution across all continents and most islands. occur from Arctic to Antarctic regions, with highest diversity in tropical and subtropical zones. The fossil record extends to the Carboniferous (Moscovian), with Archescytinidae from the Lower Permian representing basal Auchenorrhyncha. Fulgoromorpha and Cicadomorpha appear in the Upper Permian; Sternorrhyncha (Psylloidea, Aleyrodoidea) in the Upper Permian; Aphidoidea and Coccoidea in the Triassic; in the Lower Jurassic; Heteroptera in the Triassic.

Diet

Feeding habits are diverse and suborder-dependent. Most Sternorrhyncha and many Auchenorrhyncha are phytophagous, feeding on plant phloem or xylem sap using . Phloem feeders typically possess symbiotic microorganisms to convert and produce honeydew. Xylem feeders have specialized cibarial pumps to overcome negative pressure. Some Auchenorrhyncha feed on mesophyll tissue. Many Heteroptera are predatory, feeding on other insects or small ; predatory have toothed stylets and proteinase-rich saliva. A few species are : Cimex lectularius (bed bug) and triatomine kissing bugs (Reduviidae) feed on vertebrate blood. Some Sternorrhyncha are gall-formers, inducing plant tissue growth for protection and nutrition.

Life Cycle

Hemimetabolous development without complete . Life stages are , nymph, and (); no pupal stage. Nymphs resemble adults progressively through successive , with wing buds developing in later instars. Many aphids exhibit (thelytoky), producing unfertilized female offspring; some are also , bearing live young. These adaptations enable rapid increase under favorable conditions. Wing occurs in some groups, with winged, brachypterous, and forms within single , often triggered by environmental cues such as food availability.

Behavior

Locomotion includes , flying, jumping, swimming, and surface skating. Many Auchenorrhyncha (, , treehoppers, planthoppers) are adapted for jumping using saltation, with energy stored and released through elastic mechanisms. Aquatic Heteroptera swim using paddle-like legs; Gerridae skate on water surface tension. Microvelia (Veliidae) employs Marangoni propulsion using release for rapid surface movement. Sound production is common: cicadas produce loud mating songs via tymbal organs; Corixidae and Notonectidae stridulate using tibial combs against rostral ridges. Many exhibit defensive : (feigning death), toxic fluid secretion, aposematic coloration, twig mimicry, and camouflage with debris. Parental care occurs in some Heteroptera and Membracidae, including guarding.

Ecological Role

plays significant roles in functioning. Phytophagous participate in nutrient cycling and serve as food sources for insectivorous birds, other insects, and vertebrates. Phloem-feeding species produce honeydew, supporting complex involving ants, , and fungi. Mutualistic relationships include - farming, where ants protect aphids and consume honeydew. Hemipterans function as prey, driving -prey evolutionary dynamics. Some species are efficient of plant (viruses, phytoplasmas, bacteria), including Pierce's of grapevines and corn stunt diseases. Predatory species contribute to of pest .

Human Relevance

Economic impacts are substantial and mixed. Agricultural pests include aphids, scale insects, , and whiteflies that damage crops through sap extraction and transmission; major pests are cottony cushion scale, green peach aphid, and Asian citrus psyllid. (Cimex lectularius) are persistent human . Kissing bugs (Triatominae) transmit caused by . Positive uses include : predatory Heteroptera (Reduviidae, Phymatidae, Nabidae) and manage crop pests. Cochineal (Dactylopius coccus) and lac insects produce carmine dye and . are consumed as food in Asia and Africa. Cicadas have cultural significance in literature, art, and mythology since ancient Greece.

Misconceptions

The term "" is frequently misapplied to all insects or even all terrestrial arthropods. In entomological usage, "true bug" refers specifically to (or sometimes Heteroptera alone). Many insects with "bug" in their belong to other orders: lovebugs are flies (Diptera), maybugs and are beetles (Coleoptera). The obsolete order "" is still encountered in older literature; modern subsumes these groups within Hemiptera as suborders Sternorrhyncha and Auchenorrhyncha.

Sources and further reading