Alydinae

Alydinae can be distinguished from the other subfamily of Alydidae, Microelytrinae, by broader, more flattened heads relative to body size. The head is typically wider than the pronotum, giving the characteristic 'broad-headed' appearance. Antennae are four-segmented. Body form is generally elongate with slender legs. The scutellum is triangular and relatively small. Hemelytra have a distinct corium and membranous apex.

Species of Alydinae have been documented across tropical, subtropical, and temperate regions worldwide. The subfamily shows greatest diversity in tropical and subtropical zones. Specific distribution patterns vary by genus, with some genera showing restricted ranges while others are more widespread.

Some Alydinae species are known agricultural pests, particularly of legume crops. The bean bug, Riptortus pedestris (formerly placed in Alydinae, now in family Alydidae but different subfamily), and related species have been documented damaging soybean and other legumes. However, specific pest status varies considerably among genera and species within Alydinae.

• MicroelytrinaeThe other subfamily of Alydidae; distinguished by narrower heads and generally different body proportions. Microelytrinae species often have more cylindrical heads that are not distinctly wider than the pronotum.
• CoreidaeLeaf-footed bugs in family Coreidae (superfamily Coreoidea) share the elongate body form but have more expanded hind tibiae or femora in many species, and lack the distinctly broad, flattened head characteristic of Alydinae.

• Hemiptera
• Heteroptera
• Coreoidea
• Alydidae
• broad-headed bugs

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