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Crane fly

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A crane fly is a specialized insect belonging to the superfamily Tipuloidea.

Tipulidae Luc Viatour
Tipulidae Luc Viatour

These insects are found in almost every part of the world. They are most diverse in tropical regions, but they also thrive in northern latitudes and high elevations. While they are often called "mosquito hawks" or "skeeter-eaters," these names are incorrect. Adult crane flies do not prey on mosquitoes or other insects. They also lack venom and cannot bite humans. They are important members of the ecosystem, serving as both decomposers and food for other animals.

An adult crane fly has a very distinct physical structure.

Crane Fly - (Tipula)
Crane Fly - (Tipula)

They possess slender bodies and extremely long, stilt-like legs. These legs are deciduous, meaning they can break off easily from the body. Their wings often show unique wing interference patterns. Scientists use these patterns to identify different species. Most adults have a wingspan of about 25 mm, though some species, like those in the genus Holorusia, can reach 70 mm. They also feature a 'V'-shaped suture, or groove, on the back of the thorax, which is the middle section of the body.

Crane Fly wing
Crane Fly wing

The life cycle of a crane fly involves several distinct biological stages. It begins as a larva, commonly known as a leatherjacket.

Tipulidae large antennas
Tipulidae large antennas

These larvae are elongated and cylindrical, often tapering toward the front. They live in diverse habitats, including marshes, decaying wood, moist soil, and even vertebrate nests. Most leatherjackets feed on decaying plant matter and associated microbes. However, some species are different; they may eat living plants, fungi, or even other invertebrates. After the larval stage, they pupate before emerging as adults. The adult stage is quite brief, usually lasting only 10 to 15 days.

There are several different families within the superfamily Tipuloidea. The family Tipulidae includes the large crane flies, with about 4,351 described species. The family Limoniidae contains a massive group of 10,786 species. The family Pediciidae consists of hairy-eyed crane flies, with 498 species. Finally, the family Cylindrotomidae includes long-bodied crane flies, with 67 species. Other insects, like the winter crane fly (Trichoceridae), look similar but belong to a different group. Even phantom crane flies and primitive crane flies are not closely related to the true Tipuloidea.

Crane flies have a very deep history on our planet. They first appeared during the Middle Triassic period, approximately 245 million years ago. This makes them one of the oldest known groups of flies. Much of what we know comes from the work of C.P. Alexander. He was a prolific researcher who described 10,890 new species and subspecies. He also identified 256 new genera and subgenera. His work spanned 71 years, from 1910 to 1981. Today, more than 15,500 species and 500 genera of crane flies have been described by scientists.

In certain environments, crane flies can have a significant impact. In Europe, species like the marsh crane fly (Tipula oleracea) are considered agricultural pests. Their larvae live in the top layers of soil and feed on the roots and leaves of crops. This can stunt plant growth or even kill them. In the United States, these species have become invasive since the late 1900s, affecting vegetables, fruits, and cereals. Interestingly, they can also affect sports venues. In 1935, leatherjackets caused bald patches on the pitch at Lord's Cricket Ground in London.

Despite their reputation as pests, crane flies are vital to the broader biological community. As larvae, they process organic material in the soil, which increases microbial activity. This helps keep the soil healthy. As adults, they are a valuable food source for many animals. Fish, birds, spiders, amphibians, and mammals all prey on them. Some tiny mites, known as Ascidae, even use adult crane flies for transport through a process called phoresis.

This shows how deeply connected these flies are to the complex web of life.

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🖼️ Images & Media (5)
File:Crane Fly - (Tipula).jpg
Crane Fly - (Tipula).jpg
File:Crane Fly wing.jpg
Crane Fly wing.jpg
Cranefles mating.webm
File:Tipulidae Luc Viatour.jpg
Tipulidae Luc Viatour.jpg
File:Tipulidae large antennas.jpg
Tipulidae large antennas.jpg
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