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Four-spotted Chaser
''Libellula quadrimaculata'', known in Europe as the four-spotted chaser and in North America as the four-spotted skimmer, is a dragonfly of the family Libellulidae found widely throughout Europe, Asia, and North America. The adult stage is found between April to early September in the United Kingdom, and from mid-May to mid-August in Ireland. Larvae have a two-year developmental cycle. Adults feed predominantly on mosquitoes, gnats, and midges; the larvae feed primarily on other aquatic insect larvae and on tadpoles. There is a variant form, ''praenubila'' Newman, which has exaggerated wing spots. This is believed to be related to water temperatures during larval development, and appears to be more common in Europe than in the Americas. The four-spotted skimmer is the state insect of Alaska. Habitat This active dragonfly mainly lives by ponds, vernal pools, and slow flowing rivers; they are most common in June and July. Identification The brown colour and the four spot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Farmoor Reservoir
Farmoor Reservoir is a reservoir at Farmoor, Oxfordshire, England, about 5 miles (8 km) outside the city of Oxford. It is close to the east bank of the River Thames. Like most of the reservoirs in the Thames Valley, it was not formed by damming a valley. In this case the banks were raised above the local ground level using material excavated from within the bowl of the reservoir. The reservoir is split into Stage 1 (completed 1967, 4,544 million litres) and Stage 2 (completed 1976, 9,298 million litres). Among other locations, Farmoor supplies the large town of Swindon, some 25 miles (40 km) to the southwest. The reservoir is filled from the River Thames. The reservoir is used for sports: fishing (especially fly-fishing for rainbow and brown trout), dinghy sailing, windsurfing and stand up paddle boarding. Oxford SUP Club (stand-up paddle boarding), Oxford Sailing Club and the Oxford Sail Training Trust are based there. The latter offers sailing, windsurfing and p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alaska
Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S., it borders the Canadian province of British Columbia and the Yukon territory to the east; it also shares a maritime border with the Russian Federation's Chukotka Autonomous Okrug to the west, just across the Bering Strait. To the north are the Chukchi and Beaufort Seas of the Arctic Ocean, while the Pacific Ocean lies to the south and southwest. Alaska is by far the largest U.S. state by area, comprising more total area than the next three largest states (Texas, California, and Montana) combined. It represents the seventh-largest subnational division in the world. It is the third-least populous and the most sparsely populated state, but by far the continent's most populous territory located mostly north of the 60th parallel, with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Odonata Of Asia
Odonata is an order of flying insects that includes the dragonflies and damselflies. Members of the group first appeared during the Triassic, though members of their total group, Odonatoptera, first appeared in Late Carboniferous. The two common groups are distinguished with dragonflies, placed in the suborder Epiprocta, usually being larger, with eyes together and wings up or out at rest, while damselflies, suborder Zygoptera, are usually smaller with eyes placed apart and wings along body at rest. All Odonata have aquatic larvae called naiads (nymphs), and all of them, larvae and adults, are carnivorous. The adults can land, but rarely walk. Their legs are specialised for catching prey. They are almost entirely insectivorous. Etymology and terminology Fabricius coined the term ''Odonata'' in 1793 from the Ancient Greek ( Ionic form of ) 'tooth'. One hypothesis is that it was because their maxillae are notably toothed. Most insects also have toothed mandibles. The wor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Insects Of The United States
Insects (from Latin ') are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body ( head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae. Their blood is not totally contained in vessels; some circulates in an open cavity known as the haemocoel. Insects are the most diverse group of animals; they include more than a million described species and represent more than half of all known living organisms. The total number of extant species is estimated at between six and ten million; In: potentially over 90% of the animal life forms on Earth are insects. Insects may be found in nearly all environments, although only a small number of species reside in the oceans, which are dominated by another arthropod group, crustaceans, which recent research has indicated insects are nested within. Nearly all insects hatch from eg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Insects Of Canada
Insects (from Latin ') are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae. Their blood is not totally contained in vessels; some circulates in an open cavity known as the haemocoel. Insects are the most diverse group of animals; they include more than a million described species and represent more than half of all known living organisms. The total number of extant species is estimated at between six and ten million; In: potentially over 90% of the animal life forms on Earth are insects. Insects may be found in nearly all environments, although only a small number of species reside in the oceans, which are dominated by another arthropod group, crustaceans, which recent research has indicated insects are nested within. Nearly all insects hatch from eggs. Ins ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Insects Described In 1758
Insects (from Latin ') are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae. Their blood is not totally contained in vessels; some circulates in an open cavity known as the haemocoel. Insects are the most diverse group of animals; they include more than a million described species and represent more than half of all known living organisms. The total number of extant species is estimated at between six and ten million; In: potentially over 90% of the animal life forms on Earth are insects. Insects may be found in nearly all environments, although only a small number of species reside in the oceans, which are dominated by another arthropod group, crustaceans, which recent research has indicated insects are nested within. Nearly all insects hatch from eggs. Inse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fauna Of Alaska
The wildlife of Alaska is both diverse and abundant. The Alaskan Peninsula provides an important habitat for fish, mammals, reptiles, and birds. At the top of the food chain are the bears. Alaska contains about 70% of the total North American brown bear population and the majority of the grizzly bears. as well as black bears and Kodiak bears. In winter, polar bears can be found in the Kuskokwim Delta, St. Matthew Island, and at the southernmost portion of St. Lawrence Island. There are also moose and caribou, bison, wolves and wolverines, foxes, otters and beavers. Fish species are extensive, including: salmon, graylings, char, rainbow and lake trout, northern pike, halibut, pollock, and burbot. The bird population consists of hundreds of species, including: bald eagles, owls, falcons, ravens, ducks, geese, swans, and the passerines. Sea lions, seals, sea otters, and migratory whales are often found close to shore and in offshore waters. The Alaskan waters are home to two speci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dragonflies Of Europe
A dragonfly is a flying insect belonging to the infraorder Anisoptera below the order Odonata. About 3,000 extant species of true dragonfly are known. Most are tropical, with fewer species in temperate regions. Loss of wetland habitat threatens dragonfly populations around the world. Adult dragonflies are characterized by a pair of large, multifaceted compound eyes, two pairs of strong, transparent wings, sometimes with coloured patches, and an elongated body. Many dragonflies have brilliant iridescent or metallic colours produced by structural colouration, making them conspicuous in flight. An adult dragonfly's compound eyes have nearly 24,000 ommatidia each. Dragonflies can be mistaken for the closely related damselflies, which make up the other odonatan infraorder ( Zygoptera) and are similar in body plan though usually lighter in build; however, the wings of most dragonflies are held flat and away from the body, while damselflies hold their wings folded at rest, along or a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cicindela Campestris
''Cicindela campestris'', commonly called the green tiger beetle, is a widespread Eurasian species of tiger beetle. It is the type species of the large genus ''Cicindela''. Adult Adults are typically long. The elytra and thorax are green, varying in tone from light to dark, spotted with cream-coloured patches, and in bright sunlight are somewhat iridescent. The eyes are blackish; the legs are brown with whitish hairs. The antennae are long and straight, not clubbed. Behaviour The adults are sun-loving. They live in places with dry soils (sandy or chalky), mostly between May and October at the latitude of Britain. Like other tiger beetles, they run fast on their long legs and are most often seen on bare ground, in Britain typically on heather moorland Moorland or moor is a type of habitat found in upland areas in temperate grasslands, savannas, and shrublands and montane grasslands and shrublands biomes, characterised by low-growing vegetation on acidic soils. Moorland ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anax Imperator
The emperor dragonfly or blue emperor (''Anax imperator'') is a large species of hawker dragonfly of the family Aeshnidae, averaging in length. The generic name ''Anax'' is from the ancient Greek , "lord"; the specific epithet ''imperator'' is the Latin for "emperor", from ''imperare'', to command. Distribution This dragonfly has a wide distribution; it is found throughout Africa and through most of Europe, the Arabian Peninsula, and south-western and central Asia. Since 2000, its range has expanded in Europe, both northwards and to higher altitudes. Behaviour They frequently fly high up into the sky in search of prey, which includes butterflies, other Odonata and tadpoles; small prey is eaten while flying. They breed in a variety of aquatic habitats from large ponds to dikes, but they require a plentiful supply of vegetation in the water. The females lay the eggs into plants such as pondweed, and always lay alone. The larvae are very aggressive and are likely to influence the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Broad-bodied Chaser
''Libellula depressa'', the broad-bodied chaser or broad-bodied darter,Hart. M., et al, (1978), ''The Naturetrail Omnibus'', London: Usborne Publishing Limited, page 157 is one of the most common dragonflies in Europe and central Asia. It is very distinctive with a very broad flattened abdomen, four wing patches and, in the male, the abdomen becomes pruinose blue. Identification The male and female have a broad, flattened abdomen which is brown with yellow patches down the sides. In the male the abdomen develops a blue pruinosity that covers the brown colour. Both fore and hind wings have a dark patch at the base. Both the male and female have broad antehumeral stripes. The average wingspan is approximately 70 mm. ''L. depressa'' is very distinctive and should not be confused with any other dragonflies in the region. Distribution and habitat ''L. depressa'' is found in central and southern Europe, central Asia and the Middle East. It range extends northwards to so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
European Journal Of Entomology
''European Journal of Entomology'' (''EJE'') is a quarterly peer-reviewed open access scientific journal published by the Czech Academy of Sciences. It covers research in entomology, including Myriapoda, Chelicerata, and terrestrial Crustacea. It was established in 1904 by the Czech Entomological Society under the title ''Acta Societatis Entomologicae Bohemiae'', then later as ''Acta Entomologica Bohemoslovaca''. The insect depicted on the cover of the journal is ''Pyrrhocoris apterus''. According to the ''Journal Citation Reports'', the journal has a 2011 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as i ... of 1.061. In 2016, the journal became electronic-only and open access. References External links * Entomology journals and magazines Publications established ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
