{"id":8875,"date":"2021-05-17T18:29:43","date_gmt":"2021-05-17T16:29:43","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=8875"},"modified":"2021-05-29T09:50:23","modified_gmt":"2021-05-29T07:50:23","slug":"epitheca-bimaculata-femelle-emergente","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2021\/05\/17\/epitheca-bimaculata-femelle-emergente\/","title":{"rendered":"Epitheca bimaculata femelles \u00e9mergentes"},"content":{"rendered":"\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/epitheca-bimaculata-femelle-emergente-.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/epitheca-bimaculata-femelle-emergente-.jpg\" alt=\"Epitheca bimaculata femelle \u00e9mergente, \u00e9tang de Fougemagne, Coligny (France-01), 08\/05\/2021\" class=\"wp-image-8871 lazyload\" width=\"395\" height=\"296\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-.jpg 1605w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente--768x576.jpg 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente--1536x1152.jpg 1536w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente--1200x900.jpg 1200w\" data-sizes=\"(max-width: 395px) 100vw, 395px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 395px; --smush-placeholder-aspect-ratio: 395\/296;\" \/><\/a><figcaption>Epitheca bimaculata femelle \u00e9mergente, \u00e9tang de Fougemagne, Coligny (France-01), 08\/05\/2021<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:15px\">Si au cours de 2 jours et demi de prospection dans l&rsquo;Ain j&rsquo;ai eu la chance d&rsquo;observer 6 imagos, une \u00e9mergence compl\u00e8te et de nombreuses exuvies, on ne peut pas dire que j&rsquo;ai \u00e9t\u00e9 g\u00e2t\u00e9 pour les femelles ; tous les sujets que j&rsquo;ai vus sont imparfaits et les photos que je vais montrer s&rsquo;apparentent un peu \u00e0 une galerie des horreurs&#8230; \u00e0 commencer par celle-ci, \u00e0 laquelle il manque une aile. <\/p>\n\n\n\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/epitheca-bimaculata-femelle-emergente-4.jpg\"><img decoding=\"async\" width=\"903\" height=\"1204\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/epitheca-bimaculata-femelle-emergente-4.jpg\" alt=\"Epitheca bimaculata femelle \u00e9mergente, \u00e9tang de Fougemagne, Coligny (France-01), 08\/05\/2021\" class=\"wp-image-8874 size-full lazyload\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-4.jpg 903w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-4-768x1024.jpg 768w\" data-sizes=\"(max-width: 903px) 100vw, 903px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 903px; --smush-placeholder-aspect-ratio: 903\/1204;\" \/><\/a><\/figure><div class=\"wp-block-media-text__content\">\n<p class=\"wp-block-paragraph\" style=\"font-size:15px\">Ou plut\u00f4t son aile est r\u00e9duite \u00e0 un moignon. On ne saura jamais ce qu&rsquo;il s&rsquo;est pass\u00e9 ; l&rsquo;aile s&rsquo;est-elle mal d\u00e9velopp\u00e9e, est-elle rest\u00e9e \u00ab\u00a0coinc\u00e9e\u00a0\u00bb dans l&rsquo;exuvie comme cela arrive (<a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/pyrrhosoma-nymphula-emergence-piegee.jpg\">ici Pyrrhosoma nymphula<\/a>), a-t-elle \u00e9t\u00e9 victime d&rsquo;un pr\u00e9dateur ?<br>Toute la matin\u00e9e de ce 8 mai 2021 a \u00e9t\u00e9 occup\u00e9e \u00e0 observer le d\u00e9roulement d&rsquo;une \u00e9mergence, et ce n&rsquo;est que vers midi que nous avons r\u00e9ellement prospect\u00e9 le reste de l&rsquo;\u00e9tang. Et l\u00e0 est l&rsquo;explication du fait que je n&rsquo;ai trouv\u00e9 que des sujets en mauvais \u00e9tat.<\/p>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:15px\">En effet, sans pouvoir pr\u00e9ciser d&rsquo;heure, car elle d\u00e9pend de nombreux facteurs, les \u00e9mergences d&rsquo;Epitheca bimaculata se produisent le matin, et lorsque l&rsquo;on arrive \u00e0 midi, heure de cette photo, les sujets \u00ab\u00a0sains\u00a0\u00bb ont d\u00e9j\u00e0 d\u00e9coll\u00e9 et il ne reste \u00e0 l&rsquo;observateur que les sujets handicap\u00e9s, incapables de prendre leur envol. Cette remarque est transposable \u00e0 de tr\u00e8s nombreux odonates, en r\u00e9gion temp\u00e9r\u00e9e.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/epitheca-bimaculata-femelle-emergente-1.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/epitheca-bimaculata-femelle-emergente-1.jpg\" alt=\"Epitheca bimaculata femelle \u00e9mergente, \u00e9tang de Fougemagne, Coligny (France-01), 08\/05\/2021\" class=\"wp-image-8872 lazyload\" width=\"394\" height=\"305\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-1.jpg 1556w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-1-768x594.jpg 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-1-1536x1189.jpg 1536w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-1-1200x929.jpg 1200w\" data-sizes=\"(max-width: 394px) 100vw, 394px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 394px; --smush-placeholder-aspect-ratio: 394\/305;\" \/><\/a><figcaption>Epitheca bimaculata femelle \u00e9mergente, \u00e9tang de Fougemagne, Coligny (France-01), 08\/05\/2021<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:15px\">On note les ailes fortement ambr\u00e9es, ce qui est fr\u00e9quent pour les jeunes Corduliidae et en particulier les femelles. Les <a rel=\"noreferrer noopener\" href=\"http:\/\/www.meslibellules.fr\/pagesweb\/divers\/glossaire.php\" target=\"_blank\">cerco\u00efdes<\/a> sont longs et parall\u00e8les et non fortement divergents comme pour les m\u00e2les ; c&rsquo;est d&rsquo;ailleurs le seul \u00e9l\u00e9ment objectif de <a href=\"http:\/\/www.meslibellules.fr\/pagesweb\/divers\/glossaire.php\">dimorphisme sexuel<\/a> facilement observable sur ces photos mise \u00e0 part la l\u00e9g\u00e8re diff\u00e9rence d&rsquo;aspect de l&rsquo;abdomen, plus large et plus massif pour les femelles.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/epitheca-bimaculata-femelle-emergente-3.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/epitheca-bimaculata-femelle-emergente-3.jpg\" alt=\"Epitheca bimaculata femelle \u00e9mergente, \u00e9tang de Fougemagne, Coligny (France-01), 08\/05\/2021\" class=\"wp-image-8873 lazyload\" width=\"615\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-3.jpg 1853w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-3-768x416.jpg 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-3-1536x832.jpg 1536w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-3-1200x650.jpg 1200w\" data-sizes=\"(max-width: 1853px) 100vw, 1853px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1853px; --smush-placeholder-aspect-ratio: 1853\/1004;\" \/><\/a><figcaption>Epitheca bimaculata femelle \u00e9mergente, \u00e9tang de Fougemagne, Coligny (France-01), 08\/05\/2021<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:15px\">L&rsquo;absence de la classique coloration verte des imagos de la famille des Corduliidae, la pr\u00e9sence \u00e0 la base de l&rsquo;aile post\u00e9rieure d&rsquo;une <em><a href=\"http:\/\/localhost\/pagesweb\/divers\/glossaire.php\">boucle anale<\/a><\/em> en forme de botte, la tache noire \u00e0 la base de l&rsquo;aile post\u00e9rieure, ont contribu\u00e9 au fait qu&rsquo;Epitheca bimaculata aie d&rsquo;abord \u00e9t\u00e9 attach\u00e9 \u00e0 la famille des Libellulidae sous le nom de Libellula bimaculata.<br>Comme pour tous les Corduliidae, la membranule blanche est bien visible \u00e0 la base des 4 ailes ; pourquoi particuli\u00e8rement dans cette famille et \u00e0 quoi sert-elle si elle sert \u00e0 quelque chose ?<\/p>\n\n\n\n\n\n<p class=\"has-text-align-center has-light-gray-color has-text-color wp-block-paragraph\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-<\/p>\n\n\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:15px\">Si le sujet pr\u00e9c\u00e9dent avait un avenir et pourra certainement s&rsquo;envoler (j&rsquo;ai vu des sujets \u00e0 3 ailes se comporter de fa\u00e7on normale, notamment ce <a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/trithemis-annulata-male-2.jpg\">Trithemis annulata<\/a> en Namibie !) cette pauvre femelle est condamn\u00e9e avant d&rsquo;avoir entam\u00e9 sa carri\u00e8re a\u00e9rienne.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/epitheca-bimaculata-femelle-emergente-5.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/epitheca-bimaculata-femelle-emergente-5.jpg\" alt=\"Epitheca bimaculata femelle \u00e9mergente, \u00e9tang de Fougemagne, Coligny (France-01), 08\/05\/2021\" class=\"wp-image-8890 lazyload\" width=\"444\" height=\"343\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 444px; --smush-placeholder-aspect-ratio: 444\/343;\" \/><\/a><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:15px\">Cette fois-ci les ailes sont \u00e0 peine d\u00e9velopp\u00e9es, la post\u00e9rieure droite est encore compl\u00e8tement ratatin\u00e9e, comme elles le sont dans les fourreaux alaires de la larve. Il s&rsquo;agit d&rsquo;ailleurs certainement d&rsquo;une anomalie survenue lors de l&rsquo;\u00e9mergence&#8230; On sait l&rsquo;importance de la m\u00e9t\u00e9o sur le succ\u00e8s des \u00e9mergences, le r\u00f4le n\u00e9gatif de la pluie et du vent. S&rsquo;il n&rsquo;a pas plu ce 8 mai, le vent \u00e9tait assez fort avec environ 20\u2009\u00b0C vers 16 heures, au moment o\u00f9 j&rsquo;ai fait ces photos.<br>Il faut noter la longueur exceptionnelle des pattes, en particulier les pattes post\u00e9rieures ; on voit ci-dessus les griffes des tarses de la patte post\u00e9rieure gauche d\u00e9passer sous l&rsquo;herbe qui lui sert de support, presque compl\u00e8tement en bas de la photo.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/epitheca-bimaculata-femelle-emergente-7.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/epitheca-bimaculata-femelle-emergente-7.jpg\" alt=\"Epitheca bimaculata femelle \u00e9mergente, \u00e9tang de Fougemagne, Coligny (France-01), 08\/05\/2021\" class=\"wp-image-8892 lazyload\" width=\"444\" height=\"303\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-7.jpg 1761w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-7-768x525.jpg 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-7-1536x1050.jpg 1536w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-7-1200x820.jpg 1200w\" data-sizes=\"(max-width: 444px) 100vw, 444px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 444px; --smush-placeholder-aspect-ratio: 444\/303;\" \/><\/a><figcaption>Epitheca bimaculata femelle \u00e9mergente, \u00e9tang de Fougemagne, Coligny (France-01), 08\/05\/2021<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:15px\">Les pattes du c\u00f4t\u00e9 droit ne sont pas en reste \ud83d\ude09 et d&rsquo;ailleurs tous les Corduliidae ont de grandes pattes et les exuvies sont spectaculaires sur ce point.<br>Sur la derni\u00e8re photo de cette pauvre b\u00eate, ci-dessous, on aper\u00e7oit la lame vulvaire bifide sous les derniers segments ; tr\u00e8s longue elle atteint l&rsquo;extr\u00e9mit\u00e9 de l&rsquo;abdomen :<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/epitheca-bimaculata-femelle-emergente-6.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/epitheca-bimaculata-femelle-emergente-6.jpg\" alt=\"Epitheca bimaculata femelle \u00e9mergente, \u00e9tang de Fougemagne, Coligny (France-01), 08\/05\/2021\" class=\"wp-image-8891 lazyload\" width=\"375\" height=\"385\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-6.jpg 1171w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/epitheca-bimaculata-femelle-emergente-6-768x790.jpg 768w\" data-sizes=\"(max-width: 375px) 100vw, 375px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 375px; --smush-placeholder-aspect-ratio: 375\/385;\" \/><\/a><\/figure><\/div>\n\n\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/epitheca-bimaculata-accueil\/\"><img decoding=\"async\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/retour.gif\" alt=\"\" class=\"wp-image-8468 lazyload\" width=\"100\" height=\"20\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 100px; --smush-placeholder-aspect-ratio: 100\/20;\" \/><\/a><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Si au cours de 2 jours et demi de prospection dans l&rsquo;Ain j&rsquo;ai eu la chance d&rsquo;observer 6 imagos, une \u00e9mergence compl\u00e8te et de nombreuses exuvies, on ne peut pas dire que j&rsquo;ai \u00e9t\u00e9 g\u00e2t\u00e9 pour les femelles ; tous les sujets que j&rsquo;ai vus sont imparfaits et les photos que je vais montrer s&rsquo;apparentent [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","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 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