Mites are small arachnids. Mites span two large orders of arachnids, the Acariformes and the Parasitiformes, which were historically grouped together in the subclass Acari. However, most recent genetic analyses do not recover the two as each other's closest relative within Arachnida, rendering the group non-monophyletic. Most mites are tiny, less than 1 mm (0.04 in) in length, and have a simple, unsegmented body plan. The small size of most species makes them easily overlooked; some species live in water, many live in soil as decomposers, others live on plants, sometimes creating galls, while others are predators or parasites. This last type includes the commercially destructive Varroa parasite of honey bees, as well as scabies mites of humans. Most species are harmless to humans, but a few are associated with allergies or may transmit diseases.
Eriophyidae is a family of more than 200 genera of mites, which live as plant parasites, commonly causing galls or other damage to the plant tissues and hence known as gall mites. About 3,600 species have been described, but this is probably less than 10% of the actual number existing in this poorly researched family. They are microscopic mites and are yellow to pinkish white to purplish in color. The mites are worm like, and have only two pairs of legs. Their primary method of population spread is by wind. They affect a wide range of plants, and several are major pest species causing substantial economic damage to crops. Some species, however, are used as biological agents to control weeds and invasive plant species.
Aberoptus is a genus of mites belonging to the family Eriophyidae. These tiny mites, flattened in shape, live beneath the waxy layer on the underside of the leaves of certain plants.
Eriophyoidea are a superfamily of herbivorous mites. All post-embryonic instars lack the third and fourth pairs of legs, and the respiratory system is also absent.
Eriophyes is a genus of acari that forms galls, specially on trees of the family Rosaceae. Some are called blister mites. The blue butterfly Celastrina serotina has been reported to feed on these galls and also on the mites, making it one of the uncommon carnivorous Lepidoptera.
Aceria anthocoptes, also known as the russet mite, rust mite, thistle mite or the Canada thistle mite, is a species of mite that belongs to the family Eriophyidae. It was first described by Alfred Nalepa in 1892.
Acalitus is a genus of mites in the family Eriophyidae. These cosmopolitan, microscopic arthropods form galls on various plants, and some species such as Acalitus essigi and Acalitus vaccinii are pests of agricultural significance associated with berry crops. This genus includes the following species:
Aculus is a genus of mites, including the following species:
Phyllocoptes is a genus of acari, including the following species:
Aceria clianthi is a species of mite belonging to the family Eriophyidae. It is found only in New Zealand. It is notable for being host specific to threatened plants of the genus Clianthus. It is classified by Buckley et al. as "nationally critical" under the New Zealand Threat Classification System. They stated "Aceria clianthi (Eriophyidae), has been recorded only from kakabeak in cultivation and once on Lotus cornalatus [Lotus corniculatus] (Fabaceae), an introduced plant growing near kakabeak. It is given the same threat classification as kakabeak ." Heenan had earlier stated that "the two species [of Clianthus] are considered to be threatened, with C. maximus having a rank of vulnerable, whereas C. puniceus is critically endangered", but the conservation status of C. maximus was subsequently found to be more serious. These threat classifications for Clianthus apply to plants in the wild, but the species are widely cultivated. Aceria clianthi occurs on both plants in the wild and in cultivation.
Phytoptus is a genus of mites in the family Phytoptidae.
Aceria tosichella, commonly known as the wheat curl mite (WCM), is a global cereal pest and a vector for spreading and transmission of viruses like wheat streak mosaic virus (WSMV) and wheat mosaic virus (WMoV)
Eriophyes tulipae, commonly known as the dry bulb mite, is a species of mite in the genus Eriophyes. This mite feeds on members of the lily family, and has damaged garlic crops. At one time, it was also thought to feed on wheat and other grasses, but the wheat curl mite is now regarded as a different species, Aceria tosichella.
Aculus truncatus is a species of mite which causes galls on the leaves of purple willow. It was first described by Alfred Nalepa in 1892.
Aculops is a genus of mites that belongs to the family Eriophyidae that live as plant parasites. Some species, such as Aculops lycopersici, are severe crop or ornamental pests, while Aculops ailanthii is being considered as biocontrol for the extremely invasive tree-of-heaven in North America. Very little is known about this genus, with new species constantly being discovered even in well covered regions such as New Zealand.
Aceria nervisequa is a species of mite that belongs to the family Eriophyidae. It is found in Europe and was first described by Giovanni Canestrini in 1891. The mite causes galls on the leaves of beech,
Cecidophyopsis is a genus of mites belonging to the family Eriophyidae.
Pycnocomon is a genus of flowering plants belonging to the family Caprifoliaceae. They were formerly placed in the defunct family of Dipsacaceae.
Acalitus ferrugineum is a species of eriophyid mite. This microscopic organism induces erineum galls on the leaves of American beech, and is known from the United States and Canada.
Nalepella, the rust mites, is a genus of very small Trombidiform mites in the family Phytoptidae. They are commonly found on a variety of conifers, including hemlock, spruce, balsam fir, and pine. They sometimes infest Christmas trees in nurseries. Nalepella mites are vagrants, meaning they circulate around the tree; females overwinter in bark cracks. Infested spruce emit a characteristic odour.
