Cicadellinae

Latreille, 1825

sharpshooters, leafhoppers

Tribe Guides

Cicadellini(sharpshooters)
Proconiini(sharpshooters)

Cicadellinae is a of leafhoppers ( Cicadellidae) within the order Hemiptera. Members of the tribe Proconiini within this subfamily are commonly known as 'sharpshooters.' The subfamily currently contains five tribes: Cicadellini, Makilingiini, Phereurhinini, Proconiini, and Tungurahualini. Cicadellinae leafhoppers are globally distributed and are significant agricultural pests due to their role as of plant , particularly the bacterium Xylella fastidiosa, which causes including , phony peach disease, and citrus variegated .

Cuerna obtusa by (c) Jared Shorma, some rights reserved (CC BY), uploaded by Jared Shorma. Used under a CC-BY license.

Homalodisca insolita by (c) skitterbug, some rights reserved (CC BY), uploaded by skitterbug. Used under a CC-BY license.

Texananus majestus by (c) Nick Block, some rights reserved (CC BY), uploaded by Nick Block. Used under a CC-BY license.

Pronunciation

How to pronounce Cicadellinae: /sɪˌkædɛlɪˈnaɪ/

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Identification

Members of Cicadellinae can be distinguished from other leafhopper by a combination of morphological features including the structure of the , wing venation, and male genitalia. The tribe Proconiini (sharpshooters) includes notably large, often brightly colored with robust bodies. Many species exhibit distinctive color patterns that aid in identification. Precise species-level identification typically requires examination of male genitalia structures. The subfamily is supported as monophyletic in phylogenetic analyses, with Phereurhininae sometimes included within the clade.

Images

Habitat

Cicadellinae occupies diverse across its global range. are found in tropical and temperate regions, including forests, grasslands, and agricultural systems. Some show specialized habitat associations: Cavichiana species are found exclusively in bromeliads from southeastern Brazil, while many sharpshooters (Proconiini) are associated with woody plants including citrus, grapes, and other cultivated crops. The originated in the Neotropical region or was more widespread in Gondwana during the Early Cretaceous, subsequently diversifying through vicariance and .

Distribution

Global distribution with highest diversity in tropical regions. The exhibits a broad array of ecological preferences across all major biogeographic regions. Proconiini sharpshooters are particularly diverse in the New World. The Cavichiana is to southeastern Brazil. The Oriental lineage shows high diversity and in tropical Asia and the Pacific, with distributional discontinuities in Wallacea. Madagascar a diverse endemic fauna derived from New World ancestors.

Diet

All Cicadellinae are phloem or xylem feeders, using to tap into plant vascular tissues. They extract large quantities of fluid, requiring the secretion of copious amounts of liquid waste. Many are , feeding on diverse plants, while others show more restricted host associations. The diet of fluid extraction drives their role as of plant .

Host Associations

Vriesea spp. (Bromeliaceae) - Cavichiana found exclusively in bromeliads
Citrus spp. - Major crop for of Xylella fastidiosa
Vitis spp. (grape) - for Pierce's
Prunus persica (peach) - for phony peach
Nerium oleander (oleander) - for oleander leaf scorch
Coffea spp. (coffee) - for coffee leaf scorch
Ixora spp. (Rubiaceae) - Attracts sharpshooters in Brazil

Life Cycle

details vary among . Typically includes , nymph, and stages. Eggs are inserted into plant tissue using a blade-like ovipositor, sometimes causing mechanical injury. Nymphs undergo multiple (typically five instars) before reaching adulthood. In temperate regions, most species have one per year with winter spent in the egg stage; southern climates may support two generations. Some species overwinter as adults.

Behavior

Many Cicadellinae, particularly sharpshooters, exhibit strong jumping and flying abilities facilitated by enlarged hind legs with double rows of spines on the tibia. They are alert and react quickly to disturbance. Some show territorial . Females of some species, such as Aetalion reticulatum ( Aetalionidae, a related group), exhibit parental guarding of masses, though this behavior is not well documented across Cicadellinae proper. Members of the are known for producing and manipulating 'brochosomes'—waxy particles used to coat eggs after oviposition.

Ecological Role

Primary ecological role is as herbivores feeding on plant vascular tissues. More significantly, many serve as of plant , particularly the bacterium Xylella fastidiosa and related xylem-limited bacteria. This vector role makes them important agricultural pests affecting viticulture, citrus production, stone fruits, and other crops. Their feeding activity can also cause direct damage through extraction of plant fluids and mechanical injury from oviposition. They serve as prey for diverse including spiders, assassin bugs, and .

Human Relevance

Major agricultural pests due to transmission. The glassy-winged sharpshooter (Homalodisca vitripennis, formerly H. coagulata) is a significant threat to California viticulture after its introduction from the southeastern United States. Acrogonia citrina and Dilobopterus costalimai are important of citrus variegated in Brazil. Management relies on nursery certification, pruning of infected material, and using (particularly Mymaridae ). No effective chemical control exists for the pathogens transmitted. Research focuses on understanding vector , pathogen transmission dynamics, and developing plant varieties.

Similar Taxa

Membracidae (treehoppers)Similar body plan and related within Membracoidea; distinguished by enlarged pronotum often forming elaborate processes, and different wing venation
Cicadellidae other subfamilies (e.g., Deltocephalinae, Typhlocybinae)Same but differ in structure, wing venation, and genitalia; many are smaller with more cryptic coloration
Cercopidae (spittlebugs)Related Auchenorrhyncha with jumping hind legs; distinguished by different body shape and nymphs that produce spittle masses

More Details

Tribal classification

The currently comprises five tribes: Cicadellini (type tribe, includes Bothrogonia, Cicadella, Cofana, Graphocephala), Makilingiini (Makilingia), Phereurhinini (Clydacha, Dayoungia, Phereurhinus), Proconiini (sharpshooters: Homalodisca, Zyzzogeton), and Tungurahualini (Ilyapa, Tungurahuala). The Homalogoniella is currently placed as incertae sedis within the subfamily.

Phylogenetic relationships

Molecular phylogenetic studies support the monophyly of Cicadellinae, with Phereurhininae sometimes included within the clade. The is sister to Aetalionidae + + Membracidae within the superfamily Membracoidea. Divergence time estimates suggest origin in the Early Cretaceous, with subsequent diversification driven by angiosperm evolution and biogeographic processes including Gondwanan vicariance and long-distance .

Research significance

Cicadellinae, particularly Proconiini sharpshooters, are among the most intensively studied leafhoppers due to their economic importance. Research programs in California, Brazil, Argentina, and elsewhere focus on , , and . The serves as a model system for studying insect-plant- interactions and biogeographic diversification in Hemiptera.