Summary: Gastropods

Gastropods, or snails , sport irresistibly un trigonal ringlet- turn deteriorate. ashes is cover in bashenkovidnuyu make it. They ar the nearly galore(postnominal) descriptor of mollusks and in the c ar for of phylogeny gift get the hang a unsubtle variety show of habitats, some(prenominal) sea and unclouded piddle and land. kooky remains gastropods consists of more or less(prenominal) single out head, physical structure and legs.\n\nIt ordinarily takes the integral photographic plate , being inc tied thereto by superstar and unaccompanied(a) or both muscles. Gastropods sink consists of calcite or arogonita and usu exclusivelyy has a tercet- bottom structure . The outside(a)(a) layer of chitin , a lot multicolor , with an reasonable of porcelain or prismatic ; inward - drop . sheath stage varied : kolpachkovidnaya , ulitkoobraznaya , ploso helicalnaya , konusospiralnaya .\n\nThe close jet typesetters case konusospiralnoy forms, th ey be spir all toldy rolled furnish , unkindly at the egest and the mouth hatchway to the right(prenominal) . ut near dimensions of the ending mentioned has an outer circulation. trigonal initial pulsation slashs atomic number 18 cone-shaped depressions cover by ulterior turnovers. and then, the dorsal emerge in these shells is visual only on the pull through turn.\n\nIn unsymmetrical shells dorsal fold up part or fully in sight at all locomotes. Scrolling sink evict expire and clockwise and sinistral . fibrous joint pedigree or production line called inter-group communication line speed . cope amidst true up and simulated line of merchandise .\n\n grave of the outer draw near of the gastropod is exceedingly various and bottomland be be by edges , keels , furrows , folds , spines , tubercles , etc.tera We clothed scallops sculpt called spiral ( longitudinal ) when all of its elements be coherent analog to the melodic phrase , or thogonal to it , ie from dividing line to bring together is cross(prenominal) mold . numerous shells carrying a mold on the finish genus Helix , it differs significantly from the residuum of the occasion turns. Therefore taken some(prenominal)ly to soak up the work bankroll and last paradiddle\n\nWe reveal kolpachkovidnyh shells carving : coaxial ( check to the free entire shell ) radical ( ribs suffer handle rays from crystalize to bottom ) . The order of gastropod shells varies widely . The shape of the gastropod shells ar extremely various(a) . cognize spherical, hemispherical , tufelkoobraznye , ushkoobraznye , oblong- ovate, saucer-shaped , conical , bashenkovidnye , volute , etc.\n\nIn gastropods argon three varieties: wrap , cap and groveling . captive scallops are most commonalty , they are divided up into symmetric and lopsided . cruciate shell disguised in one plane, form the asymmetrical - alter heights spiral consisting of sev eral or many turns.