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Earthmoving or earthworms suborder Oligochaeta of detachment Haplotaxida. Live on all continents except Antarctica but only a few species originally had a wide range the spread of a number of representatives was due to the introduction by man. The most well-known European earthworms belong to the family Lumbricidae.
Length of body members of different species varies from 2 cm to 3 meters. The number of segments is also changeable from 80 to 300. When moving earthworms rely on short bristles located on each segment except for the front. The number of bristles ranges from several tens.
Circulatory system in worms closed sufficiently well developed the blood is red. In the earthworm two major blood vessels spinal through which the blood moves from the rear to the front part of the body and abdominal wherein the blood moves from the front to the rear part of the body. These two vessels connected by a ring vessels in each segment some of them called hearts can be reduced allowing the movement of blood. Vessels branch into small capillaries. Breathing through rich cells sensitive skin which is covered with a protective mucus. Mucus is saturated with a colossal amount of enzymes which are antiseptics. Nervous system earthworms includes underdeveloped brain and abdominal chain. Have developed the ability to regenerate.
Earthworms are hermaphroditic each of mature individuals have female and male reproductive system. They reproduce sexually using cross-fertilization. Reproduction occurs through the band within which the eggs are fertilized and develop. Belt takes a few front worm segments standing relative to the rest of the body. Exit from the belt of small worms occurs after 2-4 weeks in the form of a cocoon and they grow to adults sizes 3-4 months.
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