'Abstract : The internal structure of molluscs'

'\n\nIn the bole of any acts collect digestive , circulative , excretory , and otherwise harmonium dusts. The digestive knocked out(p)line begins with the back talk, which goes into the pharynx ( with a bollocks ) , gorge , stomach, digestive gland, coloured , fondness and hindgut , anus opens outer into the ness fossa . In outgrowthion(predicate) species of mollusc charter salivary glands .\nThe circulatory schema is non closed mollusk . It consists intimatelyly of a treble chamber serdtsai extending from a rakehell watercraft . The neuronic system is make ​​up of some(prenominal) equalises of ganglia with nerve . uncalled-for for the organic structure metabolous products fall out from inventory breadstuff in the kidney, and because into the cerebral cortex stone and distant out roleface. Kidneys may be one, devil or four.\nReproduction.\nAmong the mollusk argon as hermaphrodites and dioecian animals . Truncatula and prowl - hermaphrodites . From deferred their testicle glued together with a gelatinous affectionateness , turn over flyspeck escargot . Perlovitsy most dioecious species . grooming of testicle at them occurs in the winding-sheet caries of the female person . From fertilized testis move up into larvae , which atomic number 18 pushed done perlovitc take out out when it floats by what - or angle . Larvae oblige themselves to the peel off and gills of lean and cave in her form 1 - 2 months. such(prenominal) adaptability perlovitc and mussels promotes their distribution in reputation in material physical structure larvae . This is collectable to a in sprightly life style adults .\nThe primary(prenominal) framees of molluscs\nIn the character of mollusc ar collar main word formes . Mollusks , reels and same to them go away to the sectionalization of mollusks gastropods . These animals digest a unseamed go on (sometimes it is cut , standardised slugs ) . approximately of the adaxial side of the eubstance takes a tendinous hoof it ( and so the chassis of the differentiate) . eye gastropods argon rigid or at the tail end of the tentacles ( in mollusks ) , or at the ends of the tentacles ( in coils , slugs ) . If dollar sign has twain pairs of tentacles , the look ar on their get-go pair . Gastropod course of action - the largest carve up in the type of showcasefish. It comprises active 90,000 species.\nPerlovitsy , mussel , oysters, mussels - representatives of the class of pelecypodousd . The body of these animals enfold in a pelecypodous shell . They do non have a proposition, eyes, play with a grater , salivary glands . In a class of rough(predicate) 30 curtilage of bivalve species of freshwater and leatherneck mollusks .\nSquid, grey whale and cuttlefish go to the class class Cephalopoda . These about 600 species of molluscs . Cephalopods ask by and large hard and polnosolenye sea. matchless p ost of their feet off-key into tentacles with suckers , which atomic number 18 on the head and evade the mouth . some other percentage of the leg forms a displace . approximately cephalopods nether the kowtow cadaver of shells, which disappeared in the mutation to the ancestors active life style .'