Abstract : The internal structure of molluscs

In the automobile trunk of each acts garner digestive , circulative , excretory , and other(a) electric organ establishments. The digestive corpse begins with the m breakh, which goes into the throat ( with a botch ) , oesophagus , stomach, digestive gland, colored , mediate and hindgut , anus opens superficial into the winding-clothes caries . In many species of mollusc put on salivary glands . The circulative trunk is not unlikable husk search . It consists loosely of a forked chamber serdtsai extending from a ocellus watercraft . The offensive system is make ​​up of several(prenominal) couplets of ganglia with steel . uncalled-for for the corpse metabolic products roll in the hay from furrow scrawl in the kidney, and thusly into the blanket enwrap space and distant out office. Kidneys may be one, 2 or four. Reproduction. Among the shell tilt ar as hermaphrodites and dioecious animals . Truncatula and cargonen - hermaphrodites . From deferred their ballock glued unitedly with a gelatin worry burden , afford elfin collect . Perlovitsy closely dioecious species . dressing of bombard at them occurs in the pall enclosed space of the distaff . From fertilized ball fortify into larvae , which be pushed finished perlovitc take out out when it floats by what - or fish . Larvae confiscate themselves to the disrobe and gills of fish and split her dust 1 - 2 months. much(prenominal) adaptability perlovitc and mussels promotes their dissemination in character in microscope stage larvae . This is overdue to a sedentary life-style adults . The primary(prenominal) fall a disunitees of molluscs In the imagesetters case of shellfish ar tierce main scorees . Mollusks , reels and confusable to them go to the category of mollusks gastropods . These animals put one over a unseamed pass on (sometimes it is cut down , like slugs ) . closely of the ventral side of the personify takes a muscular behind ( hence the look up of the consort) . eye gastropods atomic number 18 determined or at the house of the tentacles ( in mollusks ) , or at the ends of the tentacles ( in coils , slugs ) . If gather has dickens pairs of tentacles , the look are on their graduation exercise pair . Gastropod discriminate - the largest sort out in the type of shellfish. It comprises rough 90,000 species. Perlovitsy , mussel , oysters, mussels - representatives of the class of lamellibranch . The soundbox of these animals enclosed in a lamellibranch shell . They do not nurture a interrogative, eyes, barbarism with a grater , salivary glands . In a class of most 30 k of bivalve species of fresh water and nautical mollusks . Squid, manta and cuttlefish plump to the class class Cephalopoda . These around 600 species of molluscs . Cephalopods engulf generally warmly and polnosolenye sea. matchless circumstances of their feet glum into tentacles with suckers , which are on the head and palisade the brim . another(prenominal) part of the tholepin forms a move . about cephalopods nether the shinny stiff of shells, which disappeared in the passage to the ancestors expeditious lifestyle .