A gear is a rotating circular machine part having cut teeth or, in the case of a cogwheel or gearwheel, inserted teeth, which mesh with another (compatible) toothed part to transmit rotational power. While doing so, they can change the torque and rotational speed being transmitted and also change the rotational axis of the power being transmitted. The teeth on the two meshing gears all have the same shape.
Hemiptera is an order of insects, commonly called true bugs, comprising over 80,000 species within groups such as the cicadas, aphids, planthoppers, leafhoppers, assassin bugs, bed bugs, and shield bugs. They range in size from 1 mm (0.04 in) to around 15 cm (6 in), and share a common arrangement of piercing-sucking mouthparts. The name "true bugs" is often limited to the suborder Heteroptera.
A planthopper is any insect in the infraorder Fulgoromorpha, in the suborder Auchenorrhyncha, a group exceeding 12,500 described species worldwide. The name comes from their remarkable resemblance to leaves and other plants of their environment and that they often "hop" for quick transportation in a similar way to that of grasshoppers. However, planthoppers generally walk very slowly. Distributed worldwide, all members of this group are plant-feeders, though few are considered pests. The infraorder contains 2 superfamily, Fulgoroidea and Delphacoidea. Fulgoroids are most reliably distinguished from the other Auchenorrhyncha by two features; the bifurcate (Y-shaped) anal vein in the forewing, and the thickened, three-segmented antennae, with a generally round or egg-shaped second segment (pedicel) that bears a fine filamentous arista.
Flatidae are a family of fulgoroid planthoppers. They are cosmopolitan in distribution and are distinguished from others in the superfamily by a combination of characters. Like all other planthoppers, they suck phloem sap of plants. Some species are known to communicate with vibrations through the plant stems. Communication may be with mates, or with ants that tend the nymphs, protecting them and gathering honeydew secretions. Adults of some species have brightly coloured forewings which are tougher and known as tegmina unlike the membranous hindwings which are used for flight. Although a few can be identified by their coloration, most species requires dissection and examination under a microscope with access to literature on already described species.
Issidae is a family of planthoppers described by Spinola in 1839, belonging to the order Hemiptera, suborder Auchenorrhyncha superfamily Fulgoroidea.
Malcolm Burrows FRS is a British zoologist, and emeritus professor of zoology at the University of Cambridge. His area of research specialization is in the neural control of animal behaviour particularly in those of small invertebrates. Some of his research examines the circuitry of neurons, muscles and the mechanics of joints involved in the rapid movements and leaps of insects.
Caliscelidae is a family of planthoppers, sap-sucking insects that belong to the order Hemiptera, suborder Auchenorrhyncha and superfamily Fulgoroidea. They are somewhat anomalous and have often been included within the family Issidae. Studies made in 2013 of the phylogeny of the Issidae and other groups using molecular techniques support the treatment of the group as a separate family. Sexual dimorphism can be marked. Some members of the family are called piglet bugs due to the shape of their snout. A particularly aberrant genus described in 2011 from India, Formiscurra, has males that resemble ants.
Issus coleoptratus is a species of planthopper belonging to the family Issidae.
Kinnaridae is a family of fulgoroid planthoppers. This is a small family with a little more than 20 genera and about a 100 species. The family was erected by Muir in 1925 and most members are found in the Oriental and Neotropical regions and only a few in the Nearctic and Palaearctic regions.
Delphacinae is a subfamily of delphacid planthoppers in the family Delphacidae. There are at least 1,700 described species in Delphacinae.
Achilidae is a family of planthoppers, sometimes called "achilids" in the order Hemiptera. There are at least 520 described species in Achilidae.
Elicinae is a subfamily of tropiduchid planthoppers in the family Tropiduchidae, with Elica the type genus.
Dictyopharinae is a subfamily of dictyopharid planthoppers in the family Dictyopharidae. There more than 100 genera and 500 described species in Dictyopharinae.
Agalmatium is a genus of planthoppers belonging to the family Issidae, subfamily Issinae.
Meenoplidae is a family of fulgoromorph planthoppers that are closely related to the Kinnaridae. They are small, with tent-like wings and usually are less than a centimetre long and a little more than a 100 species in around 25 genera are known with a distribution restricted to the Old World. They are distinguished by having one or more of their claval veins covered in sensory pits along their length. The face is usually broad and the lateral carinae are strongly elevated. The last segment of the labium is elongate. A median ocellus is usually present. The wings are always present in adults and the venation consists of a small number of veins and very few cross veins. There are two subfamilies currently considered valid Meenoplinae and Kermesiinae. About 50 species are known from Africa. Along with the Achilixiidae and Kinnaridae, they have flattened star-shaped plate organs on their antennae. The nymphs are found close to the soil while adults feed mainly on monocots. Species identity can usually be established reliably only by examination of the male genitalia. A few species Phaconeura pluto, Meenoplus cancavus, Tsingya clarkei, and Suva oloimoa are known to be cave dwelling.
Dictyophara europaea, is the type species of planthoppers belonging to the subgenus Dictyophara (Dictyophara): in the family Dictyopharidae, and tribe Dictyopharini.
The Flatinae are a subfamily of planthoppers, erected by Maximilian Spinola in 1839. Genera have been recorded from all continents except Antarctica: especially in tropical and subtropical regions.
Lycorma imperialis is a planthopper indigenous to parts of China and Indo-Malaysia. L. imperialis was originally discovered in 1846 by Adam White and has one recognized non-nominate subspecies, L. i. punicea. L. imperialis has undergone a number of reclassifications since its discovery and is one of four species in the genus Lycorma. L. imperialis follows a hemimetabolous life cycle and will undergo a series of nymphal stages (instars) before maturing to an adult.
Delphacini is an important tribe of planthoppers with a world-wide distribution.
