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Beautiful Demoiselle
The beautiful demoiselle (''Calopteryx virgo'') is a European damselfly belonging to the family Calopterygidae. It is often found along fast-flowing waters where it is most at home. Subspecies Subspecies include: *''Calopteryx virgo britannica'' Conci, 1952 *''Calopteryx virgo festiva'' ( Brullé, 1832) (eastern Mediterranean) *''Calopteryx virgo meridionalis'' Sélys, 1853 (western Mediterranean and south-west France) *''Calopteryx virgo padana'' Conci, 1956 (northern Italy) *''Calopteryx virgo virgo'' (Linnaeus, 1758) File: Calopteryx virgo meridionalis.jpg, ''Calopteryx virgo meridionalis'' File:Calopteryx virgo meridionalis MHNT.jpg, ''C. v. meridionalis''. Mounted specimen Description Eggs and larvae Females lay up to 300 eggs at a time on emergent or floating plants, often on water-crowfoot. Like the banded demoiselle, they often submerge to do so. The eggs hatch after around 14 days. Again, like the banded demoiselle, the larva is stick-like with long legs and de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carl Linnaeus
Carl Linnaeus (; 23 May 1707 – 10 January 1778), also known after his ennoblement in 1761 as Carl von Linné Blunt (2004), p. 171. (), was a Swedish botanist, zoologist, taxonomist, and physician who formalised binomial nomenclature, the modern system of naming organisms. He is known as the "father of modern taxonomy". Many of his writings were in Latin; his name is rendered in Latin as and, after his 1761 ennoblement, as . Linnaeus was born in Råshult, the countryside of Småland, in southern Sweden. He received most of his higher education at Uppsala University and began giving lectures in botany there in 1730. He lived abroad between 1735 and 1738, where he studied and also published the first edition of his ' in the Netherlands. He then returned to Sweden where he became professor of medicine and botany at Uppsala. In the 1740s, he was sent on several journeys through Sweden to find and classify plants and animals. In the 1750s and 1760s, he continued to collect an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pterostigma
The pterostigma (plural: pterostigmata) is a group of specialized cells in the outer insect wing, wings of insects, which are often thickened or coloured, and thus stand out from other cells. It is particularly noticeable in dragonfly, dragonflies, but present also in other insect groups, such as snakefly, snakeflies, hymenopterans, and megalopterans. Purpose The pterostigma, a heavier section of the wing than nearby sections, assists in gliding. Without the pterostigmata, self-exciting vibrations known as aeroelastic flutter, flutter would set in on the wing above a certain critical speed, making gliding impossible. Tests show that with the pterostigmata, the critical gliding speed is increased 10–25% on one species of dragonfly. Pseudopterostigma Some female damselfly, damselflies in the family Calopterygidae possess a ''pseudopterostigma''. This is similar in location on the wing to a true pterostigma but is crossed by veins and is only defined by its paler colour compared ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calopteryx
''Calopteryx'' may refer to: * ''Calopteryx'' (damselfly), a genus of damselflies in the family Calopterygidae * ''Calopteryx'', a genus of plants in the family Ericaceae, synonym of ''Thibaudia ''Thibaudia'' is a genus of flowering plants in the family Ericaceae. They are native to Central America, Central and South America with a high concentration of species in the cloud forests of Costa Rica and Ecuador. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calopteryx Virgo Copulating
''Calopteryx'' may refer to: * ''Calopteryx'' (damselfly), a genus of damselflies in the family Calopterygidae * ''Calopteryx'', a genus of plants in the family Ericaceae, synonym of ''Thibaudia ''Thibaudia'' is a genus of flowering plants in the family Ericaceae. They are native to Central America, Central and South America with a high concentration of species in the cloud forests of Costa Rica and Ecuador. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urtica Dioica
''Urtica dioica'', often known as common nettle, burn nettle, stinging nettle (although not all plants of this species sting) or nettle leaf, or just a nettle or stinger, is a herbaceous perennial flowering plant in the family Urticaceae. Originally native to Europe, much of temperate Asia and western North Africa, it is now found worldwide, including New Zealand and North America. The species is divided into six subspecies, five of which have many hollow stinging hairs called trichomes on the leaves and stems, which act like hypodermic needles, injecting histamine and other chemicals that produce a stinging sensation upon contact ("contact urticaria", a form of contact dermatitis). The plant has a long history of use as a source for traditional medicine, food, tea, and textile raw material in ancient (such as Saxon) and modern societies. Description ''Urtica dioica'' is a dioecious, herbaceous, perennial plant, tall in the summer and dying down to the ground in winter. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ranunculus Fluitans
''Ranunculus fluitans'' (the river water-crowfoot,) is a species of buttercup. It is a perennial water plant, which when in favourable conditions (such as fast flowing water,) can grow up to 6 m (20 ft) height.J. S. Rodwell; ''British Plant Communities: Woodlands and Scrub'' Cambridge University Press, 1990 Description ''Ranunculus fluitans'' has no floating leaves, instead it has long and narrow, tassel-like segments. Reaching up to 30 cm (12 in) long. The long, slender stems can have up to two flower stems. The white flowers are held above the water level, they are around 2–3 cm across. They are daisy-like, with 6–8 overlapping petals around a central yellow area. It blooms in June, then the rounded seed heads become hairless fruits. It is similar in form to '' Ranunculus trichophyllus'' (thread-leaved water-crowfoot), principal differences being flower petal number- thread-leaved has only 5 petals and shorter leaves- and different preferred habitat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elodea
''Elodea'' is a genus of 6 species of aquatic plants often called the waterweeds described as a genus in 1803. Classified in the frog’s-bit family (Hydrocharitaceae), ''Elodea'' is native to the Americas and is also widely used as aquarium vegetation and laboratory demonstrations of cellular activities. It lives in fresh water. An older name for this genus is ''Anacharis'', which serves as a common name in North America. The introduction of some species of ''Elodea'' into waterways in parts of Europe, Australia, Africa, Asia, and New Zealand has created a significant problem and it is now considered a noxious weed in these areas. ''Elodea canadensis'', sometimes called American or Canadian water weed or pond weed, is widely known as the generic water weed. The use of these names causes it to be confused with similar-looking plants, like Brazilian elodea (''Egeria densa'') or hydrilla (''Hydrilla verticillata''). American water weed is an attractive aquarium plant and is a good ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Larvae
A larva (; plural larvae ) is a distinct juvenile form many animals undergo before metamorphosis into adults. Animals with indirect development such as insects, amphibians, or cnidarians typically have a larval phase of their life cycle. The larva's appearance is generally very different from the adult form (''e.g.'' caterpillars and butterflies) including different unique structures and organs that do not occur in the adult form. Their diet may also be considerably different. Larvae are frequently adapted to different environments than adults. For example, some larvae such as tadpoles live almost exclusively in aquatic environments, but can live outside water as adult frogs. By living in a distinct environment, larvae may be given shelter from predators and reduce competition for resources with the adult population. Animals in the larval stage will consume food to fuel their transition into the adult form. In some organisms like polychaetes and barnacles, adults are immobil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eutrophic
Eutrophication is the process by which an entire body of water, or parts of it, becomes progressively enriched with minerals and nutrients, particularly nitrogen and phosphorus. It has also been defined as "nutrient-induced increase in phytoplankton productivity". Water bodies with very low nutrient levels are termed oligotrophic and those with moderate nutrient levels are termed mesotrophic. Advanced eutrophication may also be referred to as dystrophic and hypertrophic conditions. Eutrophication can affect freshwater or salt water systems. In freshwater ecosystems it is almost always caused by excess phosphorus. In coastal waters on the other hand, the main contributing nutrient is more likely to be nitrogen, or nitrogen and phosphorus together. This depends on the location and other factors. When occurring naturally, eutrophication is a very slow process in which nutrients, especially phosphorus compounds and organic matter, accumulate in water bodies. These nutrients derive f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
