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Subimago
Mayflies (also known as shadflies or fishflies in Canada and the upper Midwestern United States, as Canadian soldiers in the American Great Lakes region, and as up-winged flies in the United Kingdom) are aquatic insects belonging to the order Ephemeroptera. This order is part of an ancient group of insects termed the Palaeoptera, which also contains dragonflies and damselflies. Over 3,000 species of mayfly are known worldwide, grouped into over 400 genera in 42 families. Mayflies have ancestral traits that were probably present in the first flying insects, such as long tails and wings that do not fold flat over the abdomen. Their immature stages are aquatic fresh water forms (called "naiads" or "nymphs"), whose presence indicates a clean, unpolluted and highly oxygenated aquatic environment. They are unique among insect orders in having a fully winged terrestrial preadult stage, the subimago, which moults into a sexually mature adult, the imago. Mayflies "hatch" (emerge as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhithrogena Germanica
''Rhithrogena germanica'' is a European species of mayfly, and is "probably the most famous of all British mayflies", because of its use in fly fishing. It is known in the British Isles as the March brown mayfly, a name which is used in the United States for a different species, '' Rhithrogena morrisoni''. It emerges as a subimago at the end of winter, and can be distinguished from similar species by a dark spot on the femur of each leg. Description Adults and subimagos of ''Rhithrogena'' species have two long tails, and readily visible hind wings. ''R. germanica'' can only be distinguished from related species such as '' R. semicolorata'' (the only other ''Rhithrogena'' species in the United Kingdom) by the presence of a dark spot on the femora of the legs. A similar species, '' Ecdyonurus venosus'' (the ''late March brown'' or ''false March brown'') is more widespread in Great Britain, but emerges later in the year than ''R. germanica''. Distribution ''Rhithrogena germanic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leptophlebia Marginata
''Leptophlebia marginata'', the sepia dun, is a species of mayfly in the family Leptophlebiidae. It is native to Europe and North America where it is distributed widely near lakes, ponds and slow-moving streams. The larvae, which are known as nymphs, are aquatic. Distribution and habitat ''Leptophlebia marginata'' occurs in the holarctic region, in Europe and North America, including both temperate and Arctic habitats. It is associated with the edges of lakes and ponds, and the backwaters of slow-moving rivers and streams. Ecology Adult ''Leptophlebia marginata'' emerge from the aquatic nymph's final moult during daytime in early summer. The final instar nymph crawls to the surface of the water, or climbs onto an emergent plant stem, a stick or a rock, its skin splits and it emerges as a winged adult. The males fly in swarms during the day. Fertilized females have about 1200 eggs and fly over the water, dipping the tips of their abdomens in the water to lay small batches of eggs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Imago
In biology, the imago (Latin for "image") is the last stage an insect attains during its metamorphosis, its process of growth and development; it is also called the imaginal stage, the stage in which the insect attains maturity. It follows the final ecdysis of the immature instars.Carpenter, Geo. H., The Life-Story of Insects. Cambridge University Press 1913. May be downloaded from: https://www.gutenberg.org/ebooks/16410 or https://archive.org/details/thelifestoryofin16410gut In a member of the Apterygota, Ametabola or Hemimetabolism, Hemimetabola, in which metamorphosis is "incomplete", the final ecdysis follows the last immature or ''Nymph (biology), nymphal'' stage. In members of the Endopterygota, Holometabola, in which there is a pupal stage, the final ecdysis follows emergence from the pupa, after which the metamorphosis is complete, although there is a prolonged period of maturation in some species. The imago is the only stage during which the insect is Sexual maturity, se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moulting
In biology, moulting (British English), or molting (American English), also known as sloughing, shedding, or in many invertebrates, ecdysis, is the manner in which an animal routinely casts off a part of its body (often, but not always, an outer layer or covering), either at specific times of the year, or at specific points in its life cycle. In medieval times it was also known as "mewing" (from the French verb "muer", to moult), a term that lives on in the name of Britain's Royal Mews where the King's hawks used to be kept during moulting time before becoming horse stables after Tudor times. Moulting can involve shedding the epidermis (skin), pelage ( hair, feathers, fur, wool), or other external layer. In some groups, other body parts may be shed, for example, the entire exoskeleton in arthropods, including the wings in some insects. Examples In birds In birds, moulting is the periodic replacement of feathers by shedding old feathers while producing new ones. Feather ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nymph (biology)
In biology, a nymph is the immature form of some invertebrates, particularly insects, which undergoes gradual metamorphosis ( hemimetabolism) before reaching its adult stage. Unlike a typical larva, a nymph's overall form already resembles that of the adult, except for a lack of wings (in winged species). In addition, while a nymph moults, it never enters a pupal stage. Instead, the final moult results in an adult insect. Nymphs undergo multiple stages of development called instars. This is the case, for example, in Orthoptera ( crickets, grasshoppers and locusts), Hemiptera (cicadas, shield bugs, whiteflies, aphids, leafhoppers, froghoppers, treehoppers etc.), mayflies, termites, cockroaches, mantises, stoneflies and Odonata ( dragonflies and damselflies). Nymphs of aquatic insects, as in the Odonata, Ephemeroptera, and Plecoptera, are also called naiads, an Ancient Greek name for mythological water nymphs. Usage of the term 'naiad' is no longer popular among en ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gill
A gill () is a respiratory organ that many aquatic organisms use to extract dissolved oxygen from water and to excrete carbon dioxide. The gills of some species, such as hermit crabs, have adapted to allow respiration on land provided they are kept moist. The microscopic structure of a gill presents a large surface area to the external environment. Branchia (pl. branchiae) is the zoologists' name for gills (from Ancient Greek ). With the exception of some aquatic insects, the filaments and lamellae (folds) contain blood or coelomic fluid, from which gases are exchanged through the thin walls. The blood carries oxygen to other parts of the body. Carbon dioxide passes from the blood through the thin gill tissue into the water. Gills or gill-like organs, located in different parts of the body, are found in various groups of aquatic animals, including mollusks, crustaceans, insects, fish, and amphibians. Semiterrestrial marine animals such as crabs and mudskippers have gill ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cloeon Dipterum
''Cloeon dipterum'' is a species of mayfly with a Holarctic distribution. It is the most common mayfly in ponds in the British Isles and the only ovoviviparous mayfly in Europe. Males differ from females in having turbinate eyes. Description In common with other members of the genera '' Cloeon'' and '' Procloeon'', ''C. dipterum'' has a single pair of wings. This is also reflected in the specific epithet ''dipterum'', which is from the Latin ', meaning two, and the Greek ', meaning wing, and in his original description, Carl Linnaeus stated ' ("smaller wings hardly present"). The compound eyes of ''C. dipterum'' show a striking sexual dimorphism, whereby females have lateral apposition eyes, while the males' eyes have an additional dorsal "turban-shaped" parts that function as superposition eyes. These extra eyes are thought to enable the males to locate isolated females in the mating swarm. Ecology and life cycle ''Cloeon dipterum'' is unusual among mayflies in being ovoviv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George Crabbe
George Crabbe ( ; 24 December 1754 – 3 February 1832) was an English poet, surgeon and clergyman. He is best known for his early use of the realistic narrative form and his descriptions of middle and working-class life and people. In the 1770s, Crabbe began his career as a doctor's apprentice, later becoming a surgeon. In 1780, he travelled to London to make a living as a poet. After encountering serious financial difficulty and being unable to have his work published, he wrote to the statesman and author Edmund Burke for assistance. Burke was impressed enough by Crabbe's poems to promise to help him in any way he could. The two became close friends and Burke helped Crabbe greatly both in his literary career and in building a role within the church. Burke introduced Crabbe to the literary and artistic society of London, including Sir Joshua Reynolds and Samuel Johnson, who read '' The Village'' before its publication and made some minor changes. Burke secured Crabbe the impo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Holy Family With The Mayfly
''The Holy Family with the Dragonfly'', also known as ''The Holy Family with the Mayfly'', ''The Holy Family with the Locust'', and ''The Holy Family with the Butterfly'' is an engraving by the German artist Albrecht Dürer (1471–1528) from approximately 1495. It is quite small but full of intricate detail. A very popular image, copied by other printmakers within five years of creation, it is found in most major print room collections, including the Indianapolis Museum of Art and the UK Royal Collection. Description ''The Holy Family with the Dragonfly'', alternately known as ''The Holy Family with the Butterfly'', ''The Holy Family with the Locust'', and ''The Virgin with the Dragonfly'', is an early engraving by Dürer. It depicts both the Holy Family and the Holy Trinity, as the Virgin Mary sits on a bench holding Jesus with Joseph beside them, while God the Father and the Holy Ghost in the form of a dove look down from the clouds. In the lower right corner is an insect fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albrecht Dürer
Albrecht Dürer (; ; hu, Ajtósi Adalbert; 21 May 1471 – 6 April 1528),Müller, Peter O. (1993) ''Substantiv-Derivation in Den Schriften Albrecht Dürers'', Walter de Gruyter. . sometimes spelled in English as Durer (without an umlaut) or Duerer, was a German painter, printmaker, and theorist of the German Renaissance The German Renaissance, part of the Northern Renaissance, was a cultural and artistic movement that spread among Germany, German thinkers in the 15th and 16th centuries, which developed from the Italian Renaissance. Many areas of the arts and .... Born in Free Imperial City of Nuremberg, Nuremberg, Dürer established his reputation and influence across Europe in his twenties due to his high-quality List of woodcuts by Dürer, woodcut prints. He was in contact with the major Italian artists of his time, including Raphael, Giovanni Bellini, and Leonardo da Vinci, and from 1512 was patronized by Holy Roman Emperor, Emperor Maximilian I, Holy Roman Emperor, Ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Classical Antiquity
Classical antiquity (also the classical era, classical period or classical age) is the period of cultural history between the 8th century BC and the 5th century AD centred on the Mediterranean Sea, comprising the interlocking civilizations of ancient Greece and ancient Rome known as the Greco-Roman world. It is the period in which both Greek and Roman societies flourished and wielded huge influence throughout much of Europe, North Africa, and Western Asia. Conventionally, it is taken to begin with the earliest-recorded Epic Greek poetry of Homer (8th–7th-century BC), and continues through the emergence of Christianity (1st century AD) and the fall of the Western Roman Empire (5th-century AD). It ends with the decline of classical culture during late antiquity (250–750), a period overlapping with the Early Middle Ages (600–1000). Such a wide span of history and territory covers many disparate cultures and periods. ''Classical antiquity'' may also refer to an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pliny The Elder
Gaius Plinius Secundus (AD 23/2479), called Pliny the Elder (), was a Roman author, naturalist and natural philosopher, and naval and army commander of the early Roman Empire, and a friend of the emperor Vespasian. He wrote the encyclopedic '' Naturalis Historia'' (''Natural History''), which became an editorial model for encyclopedias. He spent most of his spare time studying, writing, and investigating natural and geographic phenomena in the field. His nephew, Pliny the Younger, wrote of him in a letter to the historian Tacitus: Among Pliny's greatest works was the twenty-volume work ''Bella Germaniae'' ("The History of the German Wars"), which is no longer extant. ''Bella Germaniae'', which began where Aufidius Bassus' ''Libri Belli Germanici'' ("The War with the Germans") left off, was used as a source by other prominent Roman historians, including Plutarch, Tacitus and Suetonius. Tacitus—who many scholars agree had never travelled in Germania—used ''Bella Germa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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