Flies are insects of the order Diptera, the name being derived from the Greek δι- di- "two", and πτερόν pteron "wing". Insects of this order use only a single pair of wings to fly, the hindwings having evolved into advanced mechanosensory organs known as halteres, which act as high-speed sensors of rotational movement and allow dipterans to perform advanced aerobatics. Diptera is a large order containing an estimated 1,000,000 species including horse-flies, crane flies, hoverflies, mosquitoes and others, although only about 125,000 species have been described.
A crane fly is any member of the dipteran superfamily Tipuloidea, which contains the living families Cylindrotomidae, Limoniidae, Pediciidae and Tipulidae, as well as several extinct families. "Winter crane flies", members of the family Trichoceridae, are sufficiently different from the typical crane flies of Tipuloidea to be excluded from the superfamily Tipuloidea, and are placed as their sister group within Tipulomorpha.
The apple maggot, also known as the railroad worm, is a species of fruit fly, and a pest of several types of fruits, especially apples. This species evolved about 150 years ago through a sympatric shift from the native host hawthorn to the domesticated apple species Malus domestica in the northeastern United States. This fly is believed to have been accidentally spread to the western United States from the endemic eastern United States region through contaminated apples at multiple points throughout the 20th century. The apple maggot uses Batesian mimicry as a method of defense, with coloration resembling that of the forelegs and pedipalps of a jumping spider.
Hymenolepiasis is infestation by one of two species of tapeworm: Hymenolepis nana or H. diminuta. Alternative names are dwarf tapeworm infection and rat tapeworm infection. The disease is a type of helminthiasis which is classified as a neglected tropical disease.
Dwarf tapeworm is a cosmopolitan species though most common in temperate zones, and is one of the most common cestodes infecting humans, especially children.
The Nematocera are a suborder of elongated flies with thin, segmented antennae and mostly aquatic larvae. This group is paraphyletic and contains all flies except for species from suborder Brachycera, which includes more commonly known species such as the housefly or the common fruit fly. The equivalent clade to Nematocera is the whole Diptera, with Brachycera as a subclade. Families in Nematocera include mosquitoes, crane flies, gnats, black flies, and multiple families commonly known as midges. The Nematocera typically have fairly long, fine, finely-jointed antennae. In many species, such as most mosquitoes, the female antennae are more or less threadlike, but the males have spectacularly plumose antennae.
Hippoboscidae, the louse flies or keds, are obligate parasites of mammals and birds. In this family, the winged species can fly at least reasonably well, though others with vestigial or no wings are flightless and highly apomorphic. As usual in their superfamily Hippoboscoidea, most of the larval development takes place within the mother's body, and pupation occurs almost immediately.
Boreidae, commonly called snow scorpionflies, or in the British Isles, snow fleas are a very small family of scorpionflies, containing only around 30 species, all of which are boreal or high-altitude species in the Northern Hemisphere.
Limoniidae is the largest of four crane fly families, with more than 10,700 species in more than 150 genera. Some studies have suggested it to be a paraphyletic group, with some limoniids being more closely related to Tipulidae and Cylindrotomidae than to other limoniids. Limoniid crane flies can usually be distinguished by the way the wings are held at rest. Limoniids usually hold/fold the wings along the back of the body, whereas other crane flies usually hold them out at right angles. Snow flies such as Chionea scita have no wings at all. Limoniids are also usually smaller than other crane flies, with some exceptions.
Sympetrum vicinum, the Yellow-Legged Meadowhawk is one of some fifteen North American species of autumn meadowhawk, which are members of the Odonate family Libellulidae. It grows to 26–35 mm long.
Tipula is a very large insect genus in the fly family Tipulidae. The members of this genus are sometimes collectively called common crane flies. Tipula contains over 2,000 species located throughout the world.
The New Zealand bat fly is a small, wingless insect which lives in a commensal relationship with the New Zealand lesser short-tailed bat. It is a true fly, in the order Diptera, placed in its own genus, Mystacinobia, and its own family, Mystacinobiidae. Although many other species of bat fly exist throughout the world, the New Zealand bat fly is endemic to the islands of New Zealand. It appears to be the only insect, parasitic or otherwise, which lives with these bats.
There are various disparate groups of wingless insects. Apterygota are a subclass of small, agile insects, distinguished from other insects by their lack of wings in the present and in their evolutionary history. They include Thysanura . Some species lacking wings are members of insect orders that generally do have wings. Some do not grow wings at all, having "lost" the possibility in the remote past. Some have reduced wings that are not useful for flying. Some develop wings but shed them after they are no longer useful. Other groups of insects may have castes with wings and castes without, such as ants. Ants have alate queens and males during the mating season and wingless workers, which allows for smaller workers and more populous colonies than comparable winged wasp species.
Ephydra hians, commonly known as the alkali fly, is a species of fly in the family Ephydridae, the brine flies.
Diptera is an order of winged insects commonly known as flies. Diptera, which are one of the most successful groups of organisms on Earth, are very diverse biologically. None are truly marine but they occupy virtually every terrestrial niche. Many have co-evolved in association with plants and animals. The Diptera are a very significant group in the decomposition and degeneration of plant and animal matter, are instrumental in the breakdown and release of nutrients back into the soil, and whose larvae supplement the diet of higher agrarian organisms. They are also an important component in food chains.
Eriopterini is a tribe of limoniid crane flies in the family Limoniidae. There are more than 20 genera and 3,800 described species in Eriopterini.
Chionea scita is a species of crane fly in the family Limoniidae. C. scita is known as a type of snow crane fly because it is commonly seen walking on piles of snow during the winter months. These flies are also often observed in caves and heavily wooded areas. C. scita flies are small, hairy, wingless, and somewhat spider-like in appearance, unlike other flies.
Chionea alexandriana is a species of snow fly (chionea) in the family Limoniidae. The species is common in the western mountains of North America, including Alberta, British Columbia, Washington State, Oregon, Idaho, Montana, Utah, and California. J.A. Chapman (1954), working in Montana, found them to be most abundant in snow fields at 3600-7000 feet elevation from November to April at temperatures ranging from 21-32 degrees F.
Toxorhina muliebris is a species of limoniid crane fly in the family Limoniidae. The adult of the species can be found flying in mid-June to August on the East Coast of North America from Quebec to Virginia and as far west as Wisconsin. Its grayish color is the most obvious difference from the yellowish brown Toxorhina magna which is found in the southern parts of the range of T. muliebris.
Limonia hardyana or flightless crane fly is a rare, wingless fly living in leaf litter on Oʻahu.
