{"id":8612,"date":"2016-05-16T08:00:09","date_gmt":"2016-05-16T06:00:09","guid":{"rendered":"http:\/\/codexvirtualis.fr\/codex\/?p=8612"},"modified":"2016-05-09T17:55:27","modified_gmt":"2016-05-09T15:55:27","slug":"semaine-20-2016","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-20-2016","title":{"rendered":"Semaine 20-2016"},"content":{"rendered":"<h2>Une citation<\/h2>\n<p>\u00ab\u00a0Fais de ta volont\u00e9 un soc d&rsquo;acier qui mord la terre et trace un droit sillon !\u00a0\u00bb<\/p>\n<p>Anonyme<\/p>\n<p> &nbsp; <\/p>\n<h2>Une image<\/h2>\n<figure style=\"width: 300px\" class=\"wp-caption alignnone\"><a rel=\"lightbox\" href=\"\/documents\/images\/chamelea_DSCN3860-WEB.JPG\" target=\"_blank\"><img decoding=\"async\" src=\"\/documents\/images\/chamelea_DSCN3860-WEB.JPG\" width=\"300\" alt=\"V\u00e9nus stri\u00e9e\" class \/><\/a><figcaption class=\"wp-caption-text\">V\u00e9nus stri\u00e9e (Crozon, f\u00e9vrier 2005)<\/figcaption><\/figure>\n<p> &nbsp; <\/p>\n<p>La V\u00e9nus stri\u00e9e (<em>Chamelea striatula<\/em>) est une esp\u00e8ce marine appartenant au groupe des Mollusques bivalves \u00e9galement d\u00e9sign\u00e9s par le terme lamellibranches. Elle y repr\u00e9sente la famille des V\u00e9n\u00e9rid\u00e9s.<\/p>\n<p>Elle est pr\u00e9sente depuis la partie inf\u00e9rieure de la zone intertidale, alternativement couverte et d\u00e9couverte par la mar\u00e9e, jusqu&rsquo;\u00e0 une profondeur de l&rsquo;ordre de 50 m\u00e8tres.<br \/>\nElle fr\u00e9quente les milieux meubles, de sable fin ou grossier, propre ou envas\u00e9. Elle y vit enfouie.<\/p>\n<p> &nbsp; <\/p>\n<p>La V\u00e9nus stri\u00e9e est reconnue \u00e0 la forme, aux dimensions et aux ornementations de sa coquille.<\/p>\n<p>La coquille des individus de cette esp\u00e8ce est constitu\u00e9e de deux valves, droite et gauche, semblables l&rsquo;une \u00e0 l&rsquo;autre. Elle est dite \u00e9quivalve.<\/p>\n<p>Chaque valve pr\u00e9sente une forme grossi\u00e8rement triangulaire, et poss\u00e8de un sommet pointu orient\u00e9 vers l&rsquo;avant. Sa partie ant\u00e9rieure est concave alors que sa r\u00e9gion post\u00e9rieure est rectiligne. Le bord oppos\u00e9 au sommet est arrondi.<br \/>\nEn raison de leur dissym\u00e9trie, les valves sont qualifi\u00e9es d&rsquo;in\u00e9quilat\u00e9rales.<\/p>\n<p>La longueur de la coquille est g\u00e9n\u00e9ralement de 30 mm mais elle peut atteindre 45 mm.<\/p>\n<p>Relativement \u00e9paisse, la coquille est orn\u00e9e sur sa face externe de stries concentriques marqu\u00e9es entre lesquelles de fines rides sont pr\u00e9sentes.<br \/>\nLa couleur de fond est blanche ou cr\u00e8me. Elle est fr\u00e9quemment d\u00e9cor\u00e9e de trois rayons partant du sommet et s&rsquo;\u00e9largissant vers le bord libre, de couleur brun-rouge.<br \/>\nLa face interne est g\u00e9n\u00e9ralement blanche et brillante. Elle pr\u00e9sente une ligne pall\u00e9ale nette, mat\u00e9rialisant l&rsquo;insertion du bord du manteau, forment une \u00e9chancrure post\u00e9rieure triangulaire, le sinus pall\u00e9al, marquant l&#8217;emplacement des siphons. Des taches de couleur violette ou orange maculent parfois les zones du sinus pall\u00e9al et du sommet.<\/p>\n<p> &nbsp; <\/p>\n<p>\u00c0 l&rsquo;instar des autres V\u00e9n\u00e9rid\u00e9s ayant fait l&rsquo;objet d&rsquo;articles de Codex virtualis comme la Palourde poulette en <a href=\"\/codex\/semaine-12-2016\">semaine 12-2016<\/a>, la Praire commune en <a href=\"\/codex\/semaine-11-2016\">semaine 11-2016<\/a>, la Palourde crois\u00e9e en <a href=\"\/codex\/semaine-10-2016\">semaine 10-2016<\/a> et la Montre radi\u00e9e en <a href=\"\/codex\/semaine-09-2016\">semaine 09-2016<\/a>, la V\u00e9nus stri\u00e9e r\u00e9alise une prise de nourriture par <a href=\"\/codex\/glossaire\/glossaire-de-p-a-s#suspensivorie\" target=\"_blank\">suspensivorie<\/a>. Il s&rsquo;agit de mode de prise alimentaire relevant de la <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#microphagie\" target=\"_blank\">microphagie<\/a>, impliquant une <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#filtration\" target=\"_blank\">filtration<\/a> de l&rsquo;eau du milieu.<\/p>\n<p>Elle pi\u00e8ge les particules en suspension dans l&rsquo;eau de mer gr\u00e2ce \u00e0 ses branchies. Elle g\u00e9n\u00e8re un courant d&rsquo;eau qui v\u00e9hicule les particules et traverse les branchies.<br \/>\nLes battements des cils des cellules branchiales sont \u00e0 l&rsquo;origine de la circulation de l&rsquo;eau qui entre dans la cavit\u00e9 pall\u00e9ale, d\u00e9limit\u00e9e par le manteau et o\u00f9 sont localis\u00e9es les branchies, gr\u00e2ce au siphon ventral qualifi\u00e9 d&rsquo;inhalant. Apr\u00e8s avoir transit\u00e9 \u00e0 travers les branchies, l&rsquo;eau est \u00e9vacu\u00e9e par le siphon dorsal dit exhalant. Les siphons se pr\u00e9sentent comme des tubes r\u00e9tractables, d\u00e9ploy\u00e9s jusqu&rsquo;\u00e0 la surface du s\u00e9diment en conditions immerg\u00e9es. Ils r\u00e9sultent de la soudure et de l&rsquo;expansion des bords du manteau dans la r\u00e9gion post\u00e9rieure de l&rsquo;animal.<br \/>\nLes branchies r\u00e9alisent la filtration de l&rsquo;eau et retiennent les particules. Ces derni\u00e8res sont d\u00e9vi\u00e9es par les cils lorsqu&rsquo;elles entrent \u00e0 leur contact, et achemin\u00e9es de proche en proche vers un sillon creus\u00e9 \u00e0 l&rsquo;extr\u00e9mit\u00e9 libre des branchies. Elles y sont agglom\u00e9r\u00e9es dans une substance visqueuse et l&rsquo;ensemble est transf\u00e9r\u00e9 vers la bouche o\u00f9 il est ing\u00e9r\u00e9.<\/p>\n<p> &nbsp; <\/p>\n<p>La V\u00e9nus stri\u00e9e est une esp\u00e8ce gonochorique. Elle comporte des individus m\u00e2les \u00e0 l&rsquo;origine de spermatozo\u00efdes et des individus femelles produisant des ovules.<\/p>\n<p>La p\u00e9riode de reproduction s&rsquo;\u00e9tend du printemps \u00e0 l&rsquo;automne, de mai \u00e0 septembre.<br \/>\nM\u00e2les et femelles lib\u00e8rent leurs gam\u00e8tes dans l&rsquo;eau de mer o\u00f9 a lieu la f\u00e9condation.<br \/>\nElle donne naissance \u00e0 des <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#oeuf\" target=\"_blank\">\u0153ufs<\/a>, au sein des enveloppes desquels se d\u00e9roule le <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#developpement-embryonnaire\" target=\"_blank\">d\u00e9veloppement embryonnaire<\/a>.<\/p>\n<p>L&rsquo;\u00e9closion, rupture des enveloppes de l&rsquo;\u0153uf, lib\u00e8re une <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#larve\" target=\"_blank\">larve<\/a> caract\u00e9ristique du groupe, appel\u00e9e v\u00e9lig\u00e8re en raison de la possession d&rsquo;un v\u00e9lum, voile cili\u00e9 \u00e0 vocations locomotrice et alimentaire.<br \/>\nElle \u00e9volue dans le plancton pendant 10 \u00e0 30 jours avant de se poser sur le fond et de se transformer en individu <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#juvenile\" target=\"_blank\">juv\u00e9nile<\/a> \u00e0 la faveur d&rsquo;une <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#metamorphose\" target=\"_blank\">m\u00e9tamorphose<\/a>.<\/p>\n<p>La maturit\u00e9 sexuelle est atteinte en moins d&rsquo;un an pour une dur\u00e9e de vie comprise entre 10 et 20 ans.<\/p>\n<p> &nbsp; <\/p>\n<p>Pour en savoir plus, consulter :<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span>le site <a href=\"http:\/\/www.marlin.ac.uk\/\" target=\"_blank\">Marlin<\/a> (The marine life information network \u2013 en anglais \u2013 adresse http:\/\/www.marlin.ac.uk)<\/p>\n<p>et notamment la page<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span><a href=\"http:\/\/www.marlin.ac.uk\/biotic\/browse.php?sp=6151\" target=\"_blank\">Chamelea spp.<\/a> (adresse http:\/\/www.marlin.ac.uk\/biotic\/browse.php?sp=6151 consult\u00e9e le 07 mai 2016)<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span>le site du <a href=\"http:\/\/museumwales.ac.uk\" target=\"_blank\">National museum  of wales<\/a> (en anglais \u2013 adresse : http:\/\/museumwales.ac.uk)<\/p>\n<p>et notamment la page<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span><a href=\"http:\/\/naturalhistory.museumwales.ac.uk\/britishbivalves\/Browserecord.php?-recid=250\" target=\"_blank\">Chamelea striatula <\/a> (en anglais \u2013 adresse : http:\/\/naturalhistory.museumwales.ac.uk\/britishbivalves\/Browserecord.php?-recid=250 consult\u00e9e le 07 mai 2016)<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span>le site <a href=\"http:\/\/species-identification.org\/\" target=\"_blank\">Marine species identification portal<\/a> (en anglais \u2013 adresse : http:\/\/species-identification.org)<\/p>\n<p>et notamment la page <\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span><a href=\"http:\/\/species-identification.org\/species.php?species_group=mollusca&#038;id=599\" target=\"_blank\">Chamelea striatula<\/a><br \/>\n(adresse : http:\/\/species-identification.org\/species.php?species_group=mollusca&#038;id=599 consult\u00e9e le 07 mai 2016)<\/p>\n<p> &nbsp; <\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>Une citation \u00ab\u00a0Fais de ta volont\u00e9 un soc d&rsquo;acier qui mord la terre et trace un droit sillon !\u00a0\u00bb Anonyme &nbsp; Une image &nbsp; La V\u00e9nus stri\u00e9e (Chamelea striatula) est une esp\u00e8ce marine appartenant au groupe des Mollusques bivalves \u00e9galement d\u00e9sign\u00e9s par le terme lamellibranches. Elle y repr\u00e9sente la famille des V\u00e9n\u00e9rid\u00e9s. Elle est pr\u00e9sente [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1],"tags":[28,12,23],"class_list":["post-8612","post","type-post","status-publish","format-standard","hentry","category-a-la-une","tag-biologie","tag-mollusque","tag-observation"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"S. 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