Typhlocybinae

Kirschbaum, 1868

microleafhoppers

Tribe Guides

Typhlocybinae is a of leafhoppers (Cicadellidae) containing approximately 6,000 described across ~300 , making it the second-largest leafhopper subfamily by described species and likely the largest when undescribed are included. Members are commonly known as microleafhoppers due to their small size. Many species are significant agricultural pests of crops including cotton, grape, and eggplant. The subfamily is divided into five generally accepted tribes: Alebrini, Dikraneurini, Empoascini, Erythroneurini, and Typhlocybini.

Erythroneura octonotata by (c) Victor Engel, some rights reserved (CC BY), uploaded by Victor Engel. Used under a CC-BY license.

Eratoneura fulleri by no rights reserved, uploaded by Yann Kemper. Used under a CC0 license.

Eratoneura carmini by (c) Alessandro Franchini, some rights reserved (CC BY), uploaded by Alessandro Franchini. Used under a CC-BY license.

Pronunciation

How to pronounce Typhlocybinae: /ˌtɪfləˈsaɪbɪniː/

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Identification

Typhlocybinae leafhoppers are distinguished from other Cicadellidae by their small size (often 2–3 mm), slender wedge-shaped bodies, and reduced wing venation. They are frequently mottled in green, yellow, or brown coloration. Unlike phloem-feeding leafhopper subfamilies, Typhlocybinae lack the robust microbial typical of most Auchenorrhyncha. Specific identification to or requires examination of male genitalia and wing venation patterns.

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Habitat

Associated with diverse plants including herbaceous vegetation, woody ornamentals, and agricultural crops. Specific examples include avocado orchards in Mexico, black sage and verbena in California gardens, and various Lamiaceae herbs.

Distribution

distribution with documented presence in North America (Mexico, California), Europe, Mediterranean region, Japan, Thailand, and Madagascar. The Ligurian leafhopper Eupteryx decemnotata, native to the Mediterranean, has undergone rapid range expansion in recent decades and is now established in California.

Diet

Feed on parenchyma (mesophyll tissue) of plants, a diet richer in nutrients than the phloem sap consumed by most other Auchenorrhyncha. Specific feeding documented on young avocado leaves, mint herbs (Lamiaceae), and various ornamental and crop plants.

Host Associations

Lamiaceae - herbivoryprimary for Eupteryx decemnotata and related
avocado - herbivorydocumented for Alconeura cinctella, Empoasca angustella, and Joruma sp. in Mexico
Salvia mellifera - herbivoryblack sage, documented in California
Verbena - herbivorydocumented in California

Behavior

Active insects that crawl rapidly sideways and jump when disturbed. and nymphs are typically found on the undersides of leaves. Some have been observed sharing leaves.

Ecological Role

Mesophyll feeders with minimal obligate microbial , possessing only facultative microorganisms (, , Spiroplasma, and others). This reduced microbiome, attributed to their nutrient-richer diet compared to phloem feeders, may confer greater adaptive flexibility to environmental change. Many function as agricultural pests causing direct or indirect crop damage.

Human Relevance

Numerous are major agricultural pests affecting cotton, grape, eggplant, and other crops. The Ligurian leafhopper Eupteryx decemnotata is a potential pest of mint herbs and has spread rapidly via commercial plant transportation. Damage occurs through direct feeding and potentially through transmission.

Similar Taxa

EurymelinaeClose phylogenetic relatives within Cicadellidae, but distinguished by Eurymelinae's phloem-feeding habit and diverse obligate microbial (Sulcia, Nasuia-related bacteria, Sodalis) versus Typhlocybinae's parenchyma feeding and reduced facultative microbiome
other Cicadellidae subfamiliesTyphlocybinae are generally smaller (microleafhoppers) with reduced wing venation and lack the obligate systems characteristic of most other leafhopper

More Details

Microbial ecology

Unlike most Auchenorrhyncha, Typhlocybinae lack obligate nutritional . Their microbiome consists primarily of facultative bacteria including , , Spiroplasma, Acidocella, Arsenophonus, Sodalis, Lariskella, Serratia, Cardinium, and Asaia. This distinguishes them sharply from phloem-feeding relatives.

Taxonomic diversity

The comprises five generally accepted tribes (Alebrini, Dikraneurini, Empoascini, Erythroneurini, Typhlocybini) with type Typhlocyba. Despite 6,000 described , researchers estimate this represents a fraction of actual diversity.