Order: Odonata
under three orders:
Anisotteri - Have the front and rear wings with different shapes, the eyes are large and form, touching, a globular mass, like a "helmet". When you are at rest hold their wings outstretched to the sides and are large flightless;
Zigotteri - have the front and rear wings similar in shape. The eyes are placed on either side of the head and never touch. When at rest hold their wings closed. They are smaller and more delicate body structure compared to the large Anisotteri flight and have much slower and less powerful;
Anisozigotteri - front and rear wings are identical in form but in appearance as in Zigotteri Anisottero a recall. The world only two species of the genus Epiophlebia, one in Japan and one in the region of 'Himalaya
Anatomy:
Head very long, compound eyes and antennae relatively short, the two pairs of wings, nearly equal, are elongated and membranous .. The abdomen is relatively long and slender, composed of eleven segments. The legs are inserted before the body and are not likely to walk.
chewing mouth very characteristic: the lower lip ends of the tweezers in which the dragonfly grabs the prey.
The prey is captured in two different ways of hunting: - ambush: the dragonfly is resting on a support, and sighted his prey, jump on the other hand, the catch with their feet and go back to its perch to eat it - in flight: the dragonfly attacks and devours its prey, which are usually small, in flight, without the need to rest.
species of dragonflies are marked on the Italian territory 90
Mating begins with ritualized movements of the male to attract the female, to hold her feet and then grab the back of the head with circles, the male arches' s abdomen, stimulating the female to do the same to join the genital orifice in its copulatory organ. If the female is receptive shows will respond by flexing the abdomen and juxtaposing their genital pore on the the male and thus assuming the typical location in the "heart". Some Zigotteri mate while they are laid out and only occasionally in flight. The Anisotteri can spend most mating in flight, and it remained only rarely.
Reproduction of dragonflies is in the aquatic environment. They are oviparous and after spawning elongated let them simply fall into the water or attach to the stems of aquatic plants. Dragonflies undergo incomplete metamorphosis. In all species, the nymphs emerge from eggs that mature in the water, feeding on various forms of aquatic life. The nymphs of dragonflies have a special jaw, stretch called the "mask", in which affect prey. The length of the nymphal period varies, depending on the species, from one to three or more years, during which the animal encounters to suit at least ten times. When the nymphs are fully mature they leave the aquatic environment and undergo a metamorphosis, becoming the adult form.
Dragonflies are seriously threatened, mainly due to the intensification of agricultural practices, water pollution and destruction of natural wetlands
The high temperature is required. Sites miglioriper dragonflies are sunny and sheltered dalvento, those not in constant shadow vengonocolonizzati. The abundance of vegetation is essential. Lavegetazione is submerged sviluppanole the habitat where the larvae, while the emergent vegetation and are essential as a support for dellesponde lametamorfosi
are present in almost all the world and there are only a few islands in Antarctica and the Arctic. Are very abundant in tropical regions and their number decreases moving toward the poles. For example, in Costa Rica there are 250 species, while 140 are in Florida, 90 in Italy and only 34 in England.
Trivia:
seems that about 250 million years ago during the Permian period, there were the giant dragonflies: their wings had to be about 3.5 meters long each. The most beautiful discoveries of prehistoric dragonflies have been made in the valley of Elmo in Arkansas (U.S.
In the past Japan akitsushima was also called "the island of dragonflies
For Native Americans the dragonfly, a creature of the wind, is the symbol of illusion and change. In their tradition, the dragonfly is a messenger of the spirits of the plant world.
under three orders:
Anisotteri - Have the front and rear wings with different shapes, the eyes are large and form, touching, a globular mass, like a "helmet". When you are at rest hold their wings outstretched to the sides and are large flightless;
Zigotteri - have the front and rear wings similar in shape. The eyes are placed on either side of the head and never touch. When at rest hold their wings closed. They are smaller and more delicate body structure compared to the large Anisotteri flight and have much slower and less powerful;
Anisozigotteri - front and rear wings are identical in form but in appearance as in Zigotteri Anisottero a recall. The world only two species of the genus Epiophlebia, one in Japan and one in the region of 'Himalaya
Anatomy:
Head very long, compound eyes and antennae relatively short, the two pairs of wings, nearly equal, are elongated and membranous .. The abdomen is relatively long and slender, composed of eleven segments. The legs are inserted before the body and are not likely to walk.
chewing mouth very characteristic: the lower lip ends of the tweezers in which the dragonfly grabs the prey.
The prey is captured in two different ways of hunting: - ambush: the dragonfly is resting on a support, and sighted his prey, jump on the other hand, the catch with their feet and go back to its perch to eat it - in flight: the dragonfly attacks and devours its prey, which are usually small, in flight, without the need to rest.
species of dragonflies are marked on the Italian territory 90
Mating begins with ritualized movements of the male to attract the female, to hold her feet and then grab the back of the head with circles, the male arches' s abdomen, stimulating the female to do the same to join the genital orifice in its copulatory organ. If the female is receptive shows will respond by flexing the abdomen and juxtaposing their genital pore on the the male and thus assuming the typical location in the "heart". Some Zigotteri mate while they are laid out and only occasionally in flight. The Anisotteri can spend most mating in flight, and it remained only rarely.
Reproduction of dragonflies is in the aquatic environment. They are oviparous and after spawning elongated let them simply fall into the water or attach to the stems of aquatic plants. Dragonflies undergo incomplete metamorphosis. In all species, the nymphs emerge from eggs that mature in the water, feeding on various forms of aquatic life. The nymphs of dragonflies have a special jaw, stretch called the "mask", in which affect prey. The length of the nymphal period varies, depending on the species, from one to three or more years, during which the animal encounters to suit at least ten times. When the nymphs are fully mature they leave the aquatic environment and undergo a metamorphosis, becoming the adult form.
Dragonflies are seriously threatened, mainly due to the intensification of agricultural practices, water pollution and destruction of natural wetlands
The high temperature is required. Sites miglioriper dragonflies are sunny and sheltered dalvento, those not in constant shadow vengonocolonizzati. The abundance of vegetation is essential. Lavegetazione is submerged sviluppanole the habitat where the larvae, while the emergent vegetation and are essential as a support for dellesponde lametamorfosi
are present in almost all the world and there are only a few islands in Antarctica and the Arctic. Are very abundant in tropical regions and their number decreases moving toward the poles. For example, in Costa Rica there are 250 species, while 140 are in Florida, 90 in Italy and only 34 in England.
Trivia:
seems that about 250 million years ago during the Permian period, there were the giant dragonflies: their wings had to be about 3.5 meters long each. The most beautiful discoveries of prehistoric dragonflies have been made in the valley of Elmo in Arkansas (U.S.
In the past Japan akitsushima was also called "the island of dragonflies
For Native Americans the dragonfly, a creature of the wind, is the symbol of illusion and change. In their tradition, the dragonfly is a messenger of the spirits of the plant world.
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