A kind of flat animals, who have cilia, mouth in the belly of the center, tubular endoplasmic kiss. Generally live in flowing water.
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No. 2
涡虫
涡虫
涡虫
Platyhelminthes door, the planarian Gang (tubellaria) commonly seen in species of freshwater life, is a three-intestinal mesh (tricladida). The world's nearly 400 species have been found, our record of 7 species, the Japanese Dugesia (dugesiajaponica) the most widely distributed, which is a common eastern Asia. Planarians live in shallow streams, many hidden in the rocks below, nocturnal. Takes the shape of leaf-shaped, flat dorsal, ventral dense cilia, can crawl. All light brown, more than 10 mm long. Head triangular, dorsal one point the black eye, one ear on each side of the conflict, the olfactory organ. End of body blunt tip. Later the central body and a mouth at the center of the abdomen, even in the pharyngeal pouch, the capsule has a muscular tube of the pharynx, may be out of the body. Connected to the pharynx and intestine, intestinal sub-3, a forward, two back. Planarians to worms, crustaceans, and insects for food, suck food from the pharynx, intestine that secrete digestive juices, so that melting of liquid material, and then inhaled the intestines, to digest. Indigestible food residues, still discharge port. No anal. Intestinal nutrient absorption, storage in the parenchyma. Metabolites in renal tubular exclude the former, many of the vent is located in the dorsal. Respiration through the surface to. Hermaphroditism, genital complex, gonopore in the mouth after. Reproduction, the two planarian ventral end of a coherent picture together, gonopore relative to exchange sperm. Fertilized eggs in the body, a number of fertilized eggs and yolk (nutrition) is the formation of reproductive sac secretion of mucus cocoon wrapped egg membrane, excreted in the outside hatch into immature planarians. Planarian regeneration strong force, is a good experimental material. Cross section of 2 or more segments, can then generate a complete planarian. Parenchyma is a tissue differentiation and regeneration of new cells, the main source. Regeneration has a polarity. If cut in 3 sections, front regenerate back, after the first section of students, middle of the pre-existence of the first young man back. Many marine planarians is the original type, multi-intestinal mesh (polycladida) planarian intestinal many lateral branches; no intestinal mesh (acoela) without bowel; single-intestinal (rhabdocoelida) of the intestine has been managed. Some free-living, a few parasites. Terrestrial soil poison (bipalium), living in the mountainous humid shelter, the longest up to 1 foot. Book "planaria" Translator: Zhou Qing Ling Author: Hill this thread Introduction Book for the Japanese literary awards - the Naoki reward winners, included a total of five short stories, mainly around the theme of life in unemployed women, love and worry. Title "Planaria" from a mastectomy due to breast cancer in young women hope the afterlife can become infinitely renewable "planarians," the desire, the protagonist embodies the rebirth of life for the body and desire. The author's technique of writing to write plain ordinary people in the face of life-changing time of confusion, frustration, can not extricate themselves in the slightest with the dark light, no dazzling passion and Strangeness plot, but it is helpless in the real feeling of life, the get some comfort. As the precise touch to the corner of people's minds, had a tremendous response in Japan. Author Mountain this thread Born in Yokohama City. Kanagawa University graduate, experienced workers, after living as a writer. Mr Eiichi Yoshikawa new governance literature appreciation, the Naoki Award winners, good extract from the era of casual living concept, and its eye to obtain an accurate observation of the overwhelming support of younger generations. Other books include "Love Poisoning", "blue green night down", "paper marriage" type, "to pieces", etc. And with a collection of essays, "and then I became a man," "marriage wishes" and so on.
