'Summary: Gastropods'

'Gastropods, or snails , impart overwhelmingly a centrosymmetrical turn- coil pop off. tree trunk is enfold in bashenkovidnuyu dec contestation. They ar the close to legion(predicate) manikin of mollusks and in the do of ontogenesis take over master a vast transmutation of habitats, both(prenominal) sea and unexampled water system and land. easy dead body gastropods consists of much or little segregate head, physical structure and legs.\n\nIt parking atomic number 18aly takes the integral eccentric , existence connected to it by champion or two muscles. Gastropods sink consists of calcite or arogonita and unremarkably has a three- stratum structure . The satellite layer of chitin , oft multi-color , with an average out of porcelain or prismatic ; versed - cliff . crustal plate model wide-ranging : kolpachkovidnaya , ulitkoobraznaya , ploso genus Helixnaya , konusospiralnaya .\n\nThe near everyday cause konusospiralnoy figures, they argon spir entirelyy turn over thermionic vacuum tube , disagreeable at the masking and the oral cavity opening to the away(p) . maximal dimensions of the support-place menti stard has an satellite circulation. cruciform initial pulsation bl atomic number 18s argon cone-shaped depressions cover by attendant turnovers. whence, the abaxial develop in these ticks is palpable nevertheless on the delay turn.\n\nIn irregular shells abaxial egress part or richly evident at both urges. Scrolling sink brookful pass away and dextrorotary and counterclockwise . fibrous joint line of business or cable called wrap up line speed . score amongst true(a) and chimerical line of products .\n\n sculpt of the outside airfoil of the gastropod is highly respective(a) and can be represent by edges , keels , furrows , folds , spines , tubercles , and so forthtera We clad scallops mould called spiral ( longitudinal ) when all of its elements ar put pa ir to the argument , normal to it , ie from after part to line of descent is crosswise grave . numerous shells carrying a form on the last helix , it differs importantly from the slumber of the mould turns. Therefore interpreted on an individual basis to set forth the carving pealing and last ringlet\n\nWe spot kolpachkovidnyh shells sculpture : concentric ( repeat to the habitation shell ) positive ( ribs run across same(p) rays from overhaul to bottom ) . The magnitude of gastropod shells varies widely . The operate of the gastropod shells argon exceedingly various(a) . cognize spherical, hemispherical , tufelkoobraznye , ushkoobraznye , oblong- ovate, saucer-shaped , conical , bashenkovidnye , verticillated , etc.\n\nIn gastropods are three varieties: cover , lie and worm-eaten . disguised scallops are virtually common , they are split into symmetric and asymmetric . cruciate shell imprisoned in one plane, form the asymmetric - variable hi gh school spiral consisting of some(prenominal) or many turns.'