Cicadellini

Latreille, 1825

sharpshooters

Genus Guides

Cicadellini is a large tribe of leafhoppers (sharpshooters) within the Cicadellidae, comprising approximately 1,886 described across 266 —four times more diverse than the related tribe Proconiini. These insects are characterized by their distinctive suctorial-piercing mouthparts adapted for xylem-feeding. The tribe exhibits highest diversity in the Neotropical region, with significant economic importance as of plant , particularly Xylella fastidiosa, which causes Citrus Variegated and other affecting commercial crops.

Apogonalia omani by (c) Katja Schulz, some rights reserved (CC BY). Used under a CC-BY license.

Graphocephala uhleri by (c) Cheryl Stinchcomb, some rights reserved (CC BY), uploaded by Cheryl Stinchcomb. Used under a CC-BY license.

Graphocephala versuta by (c) Katja Schulz, some rights reserved (CC BY), uploaded by Katja Schulz. Used under a CC-BY license.

Pronunciation

How to pronounce Cicadellini: //sɪkəˌdɛlɪˈnaɪ//

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Identification

Members of Cicadellini can be distinguished from Proconiini by genitalic features, though male genitalia alone are often insufficient for defining and relating due to relatively low morphological variation within the tribe. Female genitalia characters have become increasingly important for identification. The tribe is characterized by suctorial-piercing mouthparts typical of Hemiptera. Specific identification requires examination of male and female terminalia, including structure and ovipositor valvulae.

Images

Habitat

Cicadellini occupy diverse across the Neotropical region and beyond, including native forests, grasslands, and agricultural . In temperate South America, many species occur in grasslands, while at lower latitudes in Brazil they are isolated in alpine meadows on peaks of the southeast highlands. Several exhibit specialized microhabitat associations: Cavichiana species occur exclusively within bromeliad rosettes, while Balacha species are restricted to the rosette-disposed leaves of Eryngium (Apiaceae) in grassland and alpine meadow habitats.

Distribution

The tribe has a distribution with greatest diversity in the Neotropical region. In the Americas, documented occurrences include: Argentina (northeast and northwest regions, particularly Corrientes, Misiones, Entre Ríos, Tucumán, and Salta provinces); Brazil (Minas Gerais, Paraná, Rio de Janeiro, São Paulo, Rio Grande do Sul, Maranhão, Bahia, Roraima, Amazonas, Acre, Goiás, Mato Grosso, Espírito Santo, Santa Catarina); Colombia; Ecuador; Peru; Paraguay; Uruguay; and Mexico (Oaxaca). Records from Cuba are considered doubtful.

Seasonality

Seasonal fluctuation patterns have been documented in citrus agroecosystems, with maximum periods recorded for predominant . In northeastern Argentina, Dilobopterus costalimai abundance has been observed to be significantly affected by irrigation practices in citrus .

Diet

Xylem-feeding using suctorial-piercing mouthparts. Feeding occurs on vascular plant tissues, with many associated with specific plants including Citrus species (citrus fruits), coffee plants, and various spontaneous vegetation surrounding cultivated areas.

Host Associations

Citrus spp. - primary cultivated ; of Xylella fastidiosa causing Citrus Variegated
Coffea spp. - coffee plants
Eryngium spp. - Apiaceae; of Balacha , restricted to rosette-disposed leaves
Bromeliaceae - bromeliad rosettes; exclusive of Cavichiana

Life Cycle

Hemimetabolous development with five larval instars. The fifth larval instar has been described and illustrated for several including Hortensia similis, Sonesimia grossa, and Tapajosa rubromarginata. Detailed duration and specific developmental timing require further study for most species.

Behavior

Many exhibit -specific including restriction to particular microhabitats such as bromeliad rosettes or leaf rosettes of plants. Seasonal fluctuations occur in agricultural settings, with species showing preferences for either citrus or surrounding vegetation. Some species are predominantly collected in yellow sticky traps while others are more abundant in surrounding vegetation.

Ecological Role

Cicadellini serve as the most important of Xylella fastidiosa to citrus and coffee plants in the Americas. This bacterium causes Citrus Variegated (CVC), affecting all commercial varieties of sweet orange and other citrus species. In Argentina, at least 10 species have been confirmed as vectors of X. fastidiosa in citrus agroecosystems. The tribe thus plays a significant role in agricultural pest and plant .

Human Relevance

Major agricultural pests due to transmission of Xylella fastidiosa, causing significant economic damage to citrus and coffee industries. Research focuses on identifying , understanding their , and developing management strategies for control. The tribe is also subject of taxonomic research due to its high diversity and systematic complexity.

Similar Taxa

Proconiinisister tribe within Cicadellinae; Cicadellini is four times more diverse with greater systematic complexity due to lower morphological variation between members, requiring female genitalia characters for reliable identification
Membracidae (treehoppers)related within Membracoidea; distinguished by often elaborate pronotal modifications and different associations
Iassinae within Cicadellidae; includes such as Webaskola found in similar citrus agroecosystems

More Details

Systematic complexity

The tribe exhibits systematic complexity greater than Proconiini due to relatively low morphological variation between members, making male genitalia alone often insufficient for defining and relating . Female genitalia characters have become increasingly important for identification, though detailed study of female genitalia diversity remains relatively recent.

Taxonomic research needs

The tribe remains taxonomically understudied in many regions. In Argentina, information was particularly scarce prior to recent doctoral research, coming mainly from faunistic studies in commercial crops. Many await description, and plant associations, natural enemies, and detailed are poorly known for most species.

Natural enemies

Recorded natural enemies include ( Mermithidae), (Comosmocomoidea annulicornis, C. metanotalis in Mymaridae; Burksiella sp. in Trichogrammatidae), and strepsipterans (family Halictophagidae). These represent potential agents in agricultural settings.