Coreidae

Leach, 1815

Leaf-footed Bugs, Squash Bugs, Twig-wilters, Tip-wilters

is a large of predominantly sap-sucking within the suborder , comprising over 1,900 in more than 270 . Members are commonly known as due to the characteristic leaf-like expansions on the hind of many species. The family is but most diverse in tropical and subtropical regions. Several species are significant agricultural pests, including Anasa tristis () and Leptoglossus species that damage corn, citrus, and other . The family exhibits notable morphological diversity, with body lengths ranging from 7 to 45 mm and variable body shapes from broadly oval to elongated and slender.

Anasa scorbutica by (c) Francisco Farriols Sarabia, some rights reserved (CC BY), uploaded by Francisco Farriols Sarabia. Used under a CC-BY license.

Narnia snowi by (c) Bobby McCabe, some rights reserved (CC BY), uploaded by Bobby McCabe. Used under a CC-BY license.

Leptoglossus zonatus by (c) Anais Bióloga, some rights reserved (CC BY), uploaded by Anais Bióloga. Used under a CC-BY license.

Pronunciation

How to pronounce Coreidae: //kɔˈriːɪdiː//

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

Identification

Distinguished from other by the combination of four-segmented , numerous , and externally visible stink glands. Leaf-footed with expanded hind are readily recognizable; however, some like Merocoris lack this trait and instead show curved hind tibiae with -shaped hind . Distinguished from () by -feeding mouthparts and lack of forelegs. Distinguished from by broader body form and different antennal proportions.

Images

Appearance

Oval to elongated body shape, 7–45 mm in length. with four . with numerous in the membranous portion. Externally visible stink glands present. Many possess leaf-like expansions on hind ; some have enlarged, thickened, and bowed hind armed with spikes. show two projections or spots on the midline of the marking openings of stink glands, which relocate to the in .

Habitat

Diverse including agricultural areas, plantations, grasslands, woodlands, and tropical forests. Many associated with specific plants. Some species adapted to arid environments including sand dunes and lava fields. Urban and periurban environments occupied by some species such as Leptoglossus occidentalis.

Distribution

distribution with greatest diversity in tropical and subtropical regions. Present on all continents except Antarctica. In the Americas, ranging from southern Canada to Argentina. In Europe, Asia, Africa, and Australia with regional variation in composition. Some species showing recent range expansions, including Leptoglossus occidentalis spreading eastward across North America and into Europe.

Seasonality

Activity patterns vary by and latitude. In temperate regions, often seek shelter for during colder months, becoming conspicuous in autumn when entering buildings. In tropical regions, year-round activity with possible seasonal peaks. Some species show two per year with -laying beginning in early summer and second-generation adults appearing in late summer to autumn.

Diet

Predominantly , feeding on sap from branches, leaves, flowers, fruits, and seeds. Some opportunistically feed on extra-phytophagous materials including carrion, bird droppings, and . Claims of active carnivory in some species remain unsubstantiated.

Host Associations

Cucurbita pepo - squash, pumpkin
Zea mays - corn
Citrus sinensis - orange
Coffea arabica - coffee
Gossypium hirsutum - cotton
Solanum lycopersicum - tomato
Passiflora edulis - passion fruit
Opuntia spp. - prickly pear cactus
Pinus spp. - conifers
Acer spp. - maple
Quercus spp. - oak

Life Cycle

development with , , and stages. Eggs typically laid in rows on surfaces, often barrel-shaped with a circular escape hatch. Five nymphal observed in Leptoglossus . Nymphs lack fully developed , acquiring that develop into functional wings at final . Some species exhibit parental care, with females carrying eggs to reduce attack.

Behavior

Generally slow-moving, deliberate . Gregarious feeding observed in some . Defensive behaviors include release of pungent secretions from stink glands when disturbed. Some species vibrate when approached. Males of some species produce species-specific blends (cherry, vanilla, cinnamon, or rose scents) to attract mates. Some species capable of squirting defensive secretions for distance. Hind legs of leaf-footed species break off easily when handled, possibly serving as decoys.

Ecological Role

Significant agricultural pests causing fruit malformation, rotting, discoloration, abortion, and poor seed formation. Some contribute to of weedy plants including prickly pear cactus. for diverse including (Trichopoda species), , and various parasitoids (Anastatus, Ooencyrtus). Some species serve as food for humans in parts of Africa.

Human Relevance

Economic importance as pests of major including squash, corn, citrus, coffee, cotton, and tomatoes. Leptoglossus occidentalis (western conifer ) frequently enters buildings for , becoming a nuisance pest in northern North America and Europe. Some used as food in Mozambique (Petascelis remipes, known as Magodo). Misidentification with () causes unnecessary concern.

Similar Taxa

AlydidaeClosely related in superfamily ; distinguished by more slender body, different antennal proportions, and more restricted associations
ReduviidaeOften confused due to similar body shape; distinguished by predatory mouthparts, forelegs, and lack of leaf-footed leg modifications
RhopalidaeRelated in ; distinguished by usually lacking functional and different patterns
PentatomidaeSuperficially similar ; distinguished by shield-shaped body and five-segmented

Misconceptions

Frequently mistaken for (), particularly (), causing unwarranted fear. Claims of active carnivory in some remain unsubstantiated; observed predatory likely represents opportunistic feeding or misidentification with Reduviidae.

More Details

Taxonomic Status

is non- as currently defined; molecular studies indicate Hydarinae and Pseudophloeinae are more closely related to than to other coreids. Family placed in superfamily with Alydidae, , , and .

Defensive Chemistry

stink glands produce defensive secretions; gland openings visible externally in , located on in and relocating to in final .

Pheromone Biology

Male-produced exploited by (Trichopoda), which use these chemical cues to locate .