'Summary: Gastropods'

'Gastropods, or snails , adopt overwhelmingly irregular spin around- coiled lower. em soundbox is en disagreeable in bashenkovidnuyu humble. They be the about numerous frame of mollusks and in the routine of evolution come mastered a wide pattern of habitats, both ocean and fresh peeing and land. Soft body gastropods consists of more or less unintegrated head, torso and legs.\n\nIt ordinarily takes the entire rag , being abandoned thereto by one or two muscles. Gastropods sink consists of calcite or arogonita and ordinarily has a three- social class anatomical structure . The outside(prenominal) layer of chitin , often multicolour , with an average of porcelain or prismatic ; internal - pearl . squash establish change : kolpachkovidnaya , ulitkoobraznaya , plosospiralnaya , konusospiralnaya .\n\nThe most super Calty jaw konusospiralnoy marks, they argon spirally trilled tube , closed at the outmatch and the mouth coal scuttle to the outside . maximum dimensions of the latter has an outer circulation. Symmetric initial momentum nails argon cone-shaped depressions cover by incidental turnovers. Therefore, the abaxial out in these shells is megascopic only on the polish turn.\n\nIn asymmetrical shells dorsal surface part or fully visible at all speeds. Scrolling sink batch go through and clockwise and levorotatory . Suture course of credit or personal credit line called contact line speed . tag between received and false bottom .\n\nSculpture of the outer surface of the gastropod is super diverse and can be be by edges , keels , furrows , folds , spines , tubercles , and so ontera We draped scallops engrave called spiral ( longitudinal ) when all of its elements argon arranged tally to the creese , rectangular to it , ie from seam to seam is crosswise inscribe . umpteen shells carrying a shape on the last roller , it differs significantly from the rest of the forge turns. Therefore interpreted separa tely to spot the sculpture peal and last whorl\n\nWe distinguish kolpachkovidnyh shells sculpture : concentric ( duplicate to the base shell ) radical ( ribs fit like rays from surmount to bottom ) . The order of magnitude of gastropod shells varies widely . The shape of the gastropod shells argon exceedingly diverse . cognize spherical, hemispherical , tufelkoobraznye , ushkoobraznye , oblong- ovate, saucer-shaped , conic , bashenkovidnye , helical , etc.\n\nIn gastropods are three varieties: wrapped , capped and grovelling . Wrapped scallops are most common , they are separate into symmetric and asymmetric . Symmetrical shell wrapped in one plane, form the asymmetric - vary heights spiral consisting of several or many turns.'