Скачать или смотреть Demoiselles - Calopteryx virgo - European damselfly - on River Rhother at Cowdray

Demoiselles - Calopteryx virgo - European damselfly - on River Rhother at Cowdray. Calopterygidae - Dömlur - Meyjarflugur - Glermey - Vogvængjur - Vatnaskordýr - Karlflugan er blá með bláa vængi en kerlingin er græn með brúna vængi. Metallic green-blue with large, fully blue coloured wings. Length: 45mm - Males are territorial, perching in bankside plants and trees, waiting for females or chasing. They chase passing insects, often returning to the same perch. Males can stray well away from water, females live away from water unless egg-laying or seeking a mate.

Dancing banded demoiselles in summer. These are a type of damselfly which live and breed along flowing water. The males have characteristic dark blue wings. See more: https://www.nationaltrust.org.uk/wool...

Only two species of damselfly in Britain have obviously coloured wings. They both belong to the genus Calopteryx. In this species the wings of the mature male are very dark blue-black and those of the female are iridescent brown-green. The body colour is metallic blue-green in the male and green with a bronze tip in the female. The flight is fluttering, butterfly-like. Mainly found along streams and rivers, particulary those with sand or gravel bottoms. The males rest on bankside vegetation waiting for females. See more: https://british-dragonflies.org.uk/sp...

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 develops over a period of two years in submerged vegetation, plant debris or roots. They usually overwinter in mud or slime. The larvae of the beautiful demoiselle develop over 10 to 12 stages, each of which takes place between a molt. The body length is variable and highly dependent on environmental conditions. The final stage larvae are 3.5 to 4.6 millimeters and weigh about 4 milligrams, slightly below the banded demoiselle. Compared to other damselflies demoiselles larvae fall immediately on the other hand, due to their much shorter mean gill lamella. Calopteryx virgo can reach a body length of 49–54 millimetres, with a length of hindwings of 31–37 millimetres. These large, dark damselflies have small hemispherical eyes located laterally on the head, two pair of wings similar in shape and a slender abdomen. The basal area of the wings is transparent, otherwise wings are uniformly colored. The wings are also traversed by a dense network of veins. This species presents an evident sexual dimorphism in colour pattern. The male usually has much more extensive pigmentation on the wings than other Calopteryx species in its range: in the south east of its range (the Balkans and Turkey) the wings are entirely metallic blue while in other areas, there are clear areas at the base and tip of the wing. Immature males show brown wings, as the metallic blue wing color develops only with age. They have metallic blue-green bodies and blue-green eyes. The female has dark brown iridescent wings, a white patch near the tip of the wings (called a pseudopterostigma) and a metallic green body with a bronze tip of the abdomen. The distribution of the beautiful demoiselle covers all of Europe with the exception of the southwestern Iberian Peninsula, the Balearic Islands and Iceland. Mating takes place in a way that for the genus Calopteryx and is typical of an eye-catching advertising behavior precedes. The females fly over the water, always in search of suitable nesting places and fly it through the territories of males. The males who recognize the females to the reflections of the moving wings, fly towards it, once they have crossed the border area. In return, the male is on the wings of the female and begins copulation, which can last between 40 seconds and 5 minutes, the animals themselves in the "mating wheel" can rely on the vegetation. After mating, the male releases the female again and again shows this is the nesting place, the female abdomen with drooping sit for a few seconds and then follows the male. The eggs are laid in the stems of aquatic plants in the water level and below, where the female can submerge up to 90 minutes. It climbs here (unlike almost all other species of dragonflies) upside down on the stem down and stabs the eggs with the egg-laying apparatus ( ovipositor ) almost vertically into the stems. During the nesting above the water surface while the female is the male defended against other males. Both sexes mate several times a day for several weeks until her death. See more: https://en.wikipedia.org/wiki/Beautif...