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Concept
Cicadellidae
Résumé
A leafhopper is the common name for any species from the family Cicadellidae. These minute insects, colloquially known as hoppers, are plant feeders that suck plant sap from grass, shrubs, or trees. Their hind legs are modified for jumping, and are covered with hairs that facilitate the spreading of a secretion over their bodies that acts as a water repellent and carrier of pheromones. They undergo a partial metamorphosis, and have various host associations, varying from very generalized to very specific. Some species have a cosmopolitan distribution, or occur throughout the temperate and tropical regions. Some are pests or vectors of plant viruses and phytoplasmas. The family is distributed all over the world, and constitutes the second-largest hemipteran family, with at least 20,000 described species.
They belong to a lineage traditionally treated as infraorder Cicadomorpha in the suborder Auchenorrhyncha, but as the latter taxon is probably not monophyletic, many modern authors prefer to abolish the Auchenorrhyncha and elevate the cicadomorphs to a suborder Clypeorrhyncha. Members of the tribe Proconiini of the subfamily Cicadellinae are commonly known as sharpshooters.
The Cicadellidae combine the following features:
The thickened part of the antennae is very short and ends with a bristle (arista).
Two ocelli (simple eyes) are present on the top or front of the head.
The tarsi are made of three segments.
The femora are at front with, at most, weak spines.
The hind tibiae have one or more distinct keels, with a row of movable spines on each, sometimes on enlarged bases.
The base of the middle legs is close together where they originate under the thorax.
The front wings not particularly thickened.
An additional and unique character of leafhoppers is the production of brochosomes, which are thought to protect the animals, and particularly their egg clutches, from predation as well as pathogens.
Like other Exopterygota, the leafhoppers undergo direct development from nymph to adult without a pupal stage.
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