{"id":7301,"date":"2015-05-04T08:00:00","date_gmt":"2015-05-04T06:00:00","guid":{"rendered":"http:\/\/codexvirtualis.fr\/codex\/?p=7301"},"modified":"2015-05-01T17:23:38","modified_gmt":"2015-05-01T15:23:38","slug":"semaine-19-2015","status":"publish","type":"post","link":"https:\/\/codexvirtualis.fr\/codex\/semaine-19-2015","title":{"rendered":"Semaine 19-2015"},"content":{"rendered":"<h2>Une citation<\/h2>\n<p>\u00ab\u00a0Souvent on s&rsquo;est repenti d&rsquo;avoir parl\u00e9 ; mais de s&rsquo;\u00eatre tu, jamais.\u00a0\u00bb<\/p>\n<p>J. Amyot<\/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\/polymastia03-07-WEB.JPG\" target=\"_blank\"><img decoding=\"async\" src=\"\/documents\/images\/polymastia03-07-WEB.JPG\" width=\"300\" alt=\"\u00c9ponge \u00e0 languettes\" class \/><\/a><figcaption class=\"wp-caption-text\">\u00c9ponge \u00e0 languettes (Roscoff, f\u00e9vrier 2007)<\/figcaption><\/figure>\n<p> &nbsp; <\/p>\n<p>L&rsquo;\u00c9ponge \u00e0 languettes (<em>Polymastia penicillus<\/em>) est un animal marin appartenant au groupe des D\u00e9mosponges.<\/p>\n<p>L&rsquo;esp\u00e8ce est pr\u00e9sente dans la partie inf\u00e9rieure de la zone intertidale, alternativement couverte et d\u00e9couverte par la mar\u00e9e, mais surtout entre 5 et 25 m\u00e8tres de profondeur.<\/p>\n<p>Les individus vivent \u00e0 la limite entre les milieux rocheux et sableux, fix\u00e9s sur un substrat solide parfois dans des fissures, et sont fr\u00e9quemment recouverts de sable.<br \/>\nIls affectionnent les environnements riches en particules en suspension.<\/p>\n<p> &nbsp; <\/p>\n<p>L&rsquo;\u00c9ponge \u00e0 languettes est ais\u00e9ment identifi\u00e9e \u00e0 ses dimensions, sa forme et sa couleur.<\/p>\n<p>Elle est constitu\u00e9e d&rsquo;une base encro\u00fbtante et rugueuse dont le diam\u00e8tre est de l&rsquo;ordre de 150 mm et l&rsquo;\u00e9paisseur de 20 mm.<br \/>\nElle porte de nombreuses excroissances tubuleuses et lisses, partiellement r\u00e9tractiles, dont la longueur peut atteindre 100 mm en pleine extension, pour un diam\u00e8tre compris entre 3 et 5 mm. Elles sont appel\u00e9es papilles.<\/p>\n<p>La couleur de la base est p\u00e2le, g\u00e9n\u00e9ralement jaune gris\u00e2tre, plus rarement jaune orang\u00e9. Elle est le plus souvent masqu\u00e9e par le sable qui couvre l&rsquo;individu.<br \/>\nLes papilles sont de couleur blanc cr\u00e8me ou jaun\u00e2tre, parfois translucides. De fines baguettes de soutien, les spicules, sont quelquefois visibles par transparence.<\/p>\n<p> &nbsp; <\/p>\n<p>L&rsquo;\u00c9ponge \u00e0 languettes, \u00e0 l&rsquo;instar des autres \u00c9ponges, se nourrit de particules en suspension dans l&rsquo;eau de mer.<br \/>\nElle en r\u00e9alise le pr\u00e9l\u00e8vement en g\u00e9n\u00e9rant un courant d&rsquo;eau qui traverse sa paroi corporelle. Les particules emport\u00e9es par l&rsquo;eau sont capt\u00e9es par des cellules sp\u00e9cialis\u00e9es, les choanocytes, qui sont \u00e9galement \u00e0 l&rsquo;origine du courant d&rsquo;eau gr\u00e2ce aux battements de leurs flagelles.<\/p>\n<p>Dans le cas de cette esp\u00e8ce, il existe deux types de papilles : certaines portent uniquement des orifices inhalants appel\u00e9s ostioles sur leur surface alors que d&rsquo;autres, plus rares et plus grandes, pr\u00e9sentent en outre un large orifice apical exhalant d\u00e9sign\u00e9 par le terme d&rsquo;oscule.<br \/>\nL&rsquo;eau p\u00e9n\u00e8tre dans le corps par l&rsquo;ensemble des ostioles. Elle est drain\u00e9e par des canaux d\u00e9bouchant dans les papilles poss\u00e9dant un oscule avant d&rsquo;\u00eatre \u00e9vacu\u00e9e.<\/p>\n<p>En relation avec ce type de prise alimentaire, l&rsquo;esp\u00e8ce est qualifi\u00e9e de suspensivore, pratiquant une microphagie par filtration.<\/p>\n<p> &nbsp; <\/p>\n<p>L&rsquo;\u00c9ponge \u00e0 languettes est une esp\u00e8ce hermaphrodite : les individus produisent des gam\u00e8tes m\u00e2les, les spermatozo\u00efdes, et des gam\u00e8tes femelles, les ovules, de mani\u00e8re asynchrone.<\/p>\n<p>La reproduction intervient en \u00e9t\u00e9.<\/p>\n<p>Spermatozo\u00efdes et ovules sont lib\u00e9r\u00e9s dans l&rsquo;eau de mer o\u00f9 se d\u00e9roule 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 desquels un court <a href=\"\/codex\/glossaire\/glossaire-de-d-a-h#developpement-embryonnaire\" target=\"_blank\">d\u00e9veloppement embryonnaire<\/a> se produit. Sa dur\u00e9e est de l&rsquo;ordre de 24 heures.<\/p>\n<p>L&rsquo;\u00e9closion des \u0153ufs lib\u00e8re des <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#larve\" target=\"_blank\">larves<\/a> munies de flagelles, appel\u00e9es c\u0153loblastulas.<br \/>\nElles gagnent le fond et peuvent s&rsquo;y d\u00e9placer par reptation pendant trois semaines avant de se fixer et se transformer en individus <a href=\"\/codex\/glossaire\/glossaire-de-i-a-o#juvenile\" target=\"_blank\">juv\u00e9niles<\/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>L&rsquo;esp\u00e8ce est par ailleurs capable de reproduction asexu\u00e9e par bourgeonnement.<br \/>\nDes excroissances sont form\u00e9es par des multiplications cellulaires de type mitotique, puis se d\u00e9tachent de l&rsquo;individu parent avant de donner naissance \u00e0 un nouvel individu.<\/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:\/\/doris.ffessm.fr\" target=\"_blank\">Doris<\/a> (Donn\u00e9es d\u2019observations pour la reconnaissance et l\u2019identification de la faune et de la flore subaquatiques \u2013 F\u00e9d\u00e9ration fran\u00e7aise d\u2019\u00e9tudes et de sports sous-marins \u2013 adresse : http:\/\/doris.ffessm.fr)<\/p>\n<p>et notamment<\/p>\n<p><span style=\"color: #999999;\">&bull; <\/span>la fiche <a href=\"http:\/\/doris.ffessm.fr\/fiche2.asp?fiche_numero=557\" target=\"_blank\">LE GRANCH\u00c9 Philippe, BRETON G\u00e9rard,  in : DORIS, 28\/10\/2014 : Polymastia penicillus (Montagu, 1814)<\/a> (adresse : http:\/\/doris.ffessm.fr\/fiche2.asp?fiche_numero=557)<\/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><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> &nbsp; <\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>Une citation \u00ab\u00a0Souvent on s&rsquo;est repenti d&rsquo;avoir parl\u00e9 ; mais de s&rsquo;\u00eatre tu, jamais.\u00a0\u00bb J. Amyot &nbsp; Une image &nbsp; L&rsquo;\u00c9ponge \u00e0 languettes (Polymastia penicillus) est un animal marin appartenant au groupe des D\u00e9mosponges. L&rsquo;esp\u00e8ce est pr\u00e9sente dans la partie inf\u00e9rieure de la zone intertidale, alternativement couverte et d\u00e9couverte par la mar\u00e9e, mais surtout entre [&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":[28,41,23],"class_list":["post-7301","post","type-post","status-publish","format-standard","hentry","category-a-la-une","tag-biologie","tag-demosponge","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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