Delphacoidea

The definitive diagnostic feature is a large, movable spur (or calcar) at the apex of the hind tibia, absent in other planthopper superfamilies. This spur articulates with the tibia and can be folded back. Delphacids are generally smaller and more slender than most other planthoppers, with wings often held roof-like over the body. Many species have reduced wings (brachyptery) or fully developed wings (macroptery) within populations.

Primarily associated with grasses and sedges (Poales), including cultivated cereals and wild grassland species. Habitats range from wetlands and marshes to agricultural fields, grasslands, and forest understories where host grasses occur.

Cosmopolitan distribution with highest diversity in tropical and subtropical regions. Particularly abundant in Southeast Asia, where rice-feeding species dominate agricultural ecosystems.

All members are phloem-feeding herbivores specialized on monocotyledonous plants, predominantly grasses (Poaceae) and sedges (Cyperaceae). Many species are host-specific to particular grass genera.

• Poaceae - primary hostgrasses including rice, wheat, and wild species
• Cyperaceae - secondary hostsedges in wetland habitats

Hemimetabolous development with egg, nymph, and adult stages. Eggs are inserted into plant tissue, often in leaf sheaths or stems. Nymphs pass through five instars, remaining on host plants throughout development. Multiple generations per year occur in tropical regions; temperate species often overwinter as eggs or nymphs.

Strong jumping ability using enlarged hind legs. Many species are dispersive, with macropterous forms undertaking long-distance migrations facilitated by wind currents. Males produce species-specific courtship songs through substrate-borne vibrations. Some species exhibit density-dependent wing dimorphism, with crowded conditions inducing macropterous forms.

Significant herbivores in grassland ecosystems, regulating plant productivity and serving as prey for diverse predators including spiders, parasitoid wasps, and insectivorous birds. Some species vector plant pathogens, notably rice viruses.

Contains major agricultural pests threatening global rice production. The brown planthopper (*Nilaparvata lugens*) and white-backed planthopper (*Sogatella furcifera*) cause billions of dollars in annual crop losses across Asia. Management relies heavily on insecticides and resistant rice varieties, driving evolution of pesticide resistance and virulent biotypes.

• FulgoroideaOther planthopper superfamily; distinguished by absence of hind tibial spur and generally larger, more robust body form with often elaborate head projections
• TettigometroideaSmaller planthopper superfamily; lacks movable hind tibial spur and has different wing venation

• planthopper
• agricultural pest
• rice pest
• grass-feeder
• Auchenorrhyncha
• Fulgoromorpha
• phloem-feeder
• vector
• economic pest
• hemipteran

• BugGuide
• iNaturalist taxon
• Catalogue of Life