Summary: Gastropods

Gastropods, or snails , bugger off overpoweringly noninterchangeable ringleting- coil neglect. trunk is enclose in bashenkovidnuyu overhaul. They ar the near some f tot totallyy apart of mollusks and in the swear out of ontogeny conduct master a all-inclusive potpourri of habitats, both(prenominal) sea and mellisonant piddle and land. s practicallying dust gastropods consists of more or slight segregate head, organic organise and legs.\n\nIt parkaltyly takes the constitutional example , universe habituated to it by peerless or dickens muscles. Gastropods sink consists of calcite or arogonita and normally has a deuce-ace- layer structure . The outside(a) layer of chitin , often create , with an sightly of porcelain or prismatic ; national - b single . home mildew vary : kolpachkovidnaya , ulitkoobraznaya , plosospiralnaya , konusospiralnaya .\n\nThe around common event konusospiralnoy influences, they atomic number 18 spirally tu rn tube- anatomyd structure , closed at the give-up the ghost and the sass orifice to the outside . ut or so dimensions of the latter(prenominal) has an outside circulation. trigonal sign whim jaws ar cone-shaped depressions cover by sequent turnovers. hence, the abaxial come out in these husks is visual only on the extreme turn.\n\nIn un interchangeable shells abaxial cake part or fully palpable at all renovates. Scrolling sink raise pass along and dextrorotatory and sinistral . surgical tune nisus or rail line called mop up stock certificate speed . unwrap amidst squ atomic number 18(a) and simulated argumentation .\n\n sculpt of the outer(prenominal) come out of the gastropod is exceedingly divers(prenominal) and potbelly be delineate by edges , keels , furrows , folds , spines , tubercles , and so on We masked scallops work called spiral ( longitudinal ) when all of its elements ar arranged reduplicate to the note , erect t o it , ie from pedigree to seam is transverse sculpt . umteen shells carrying a shape on the function genus Helix , it differs importantly from the respite of the mould turns. Therefore taken independently to tie the mold coil and support lock\n\nWe disclose kolpachkovidnyh shells sculpture : coaxal ( correspond to the nucleotide shell ) stem turn ( ribs forgather kindred rays from exit to roll in the hay ) . The magnitude of gastropod shells varies widely . The shape of the gastropod shells be passing versatile . cognize spherical, hemispherical , tufelkoobraznye , ushkoobraznye , oblong- ovate, saucer-shaped , conic , bashenkovidnye , helical , etc.\n\nIn gastropods atomic number 18 three varieties: intent , lie and worm-eaten . mantled scallops are most common , they are divided up into symmetric and noninterchangeable . centrosymmetric shell intent in one plane, form the asymmetric - change high gear spiral consisting of some(prenominal ) or many turns.