{"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'Ain j'ai eu la chance d'observer 6 imagos, une \u00e9mergence compl\u00e8te et de nombreuses exuvies, on ne peut pas dire que j'ai \u00e9t\u00e9 g\u00e2t\u00e9 pour les femelles ; tous les sujets que j'ai vus sont imparfaits et les photos que je vais montrer s'apparentent un peu \u00e0 une galerie des horreurs... \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'il s'est pass\u00e9 ; l'aile s'est-elle mal d\u00e9velopp\u00e9e, est-elle rest\u00e9e \"coinc\u00e9e\" dans l'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'un pr\u00e9dateur ?<br>Toute la matin\u00e9e de ce 8 mai 2021 a \u00e9t\u00e9 occup\u00e9e \u00e0 observer le d\u00e9roulement d'une \u00e9mergence, et ce n'est que vers midi que nous avons r\u00e9ellement prospect\u00e9 le reste de l'\u00e9tang. Et l\u00e0 est l'explication du fait que je n'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'heure, car elle d\u00e9pend de nombreux facteurs, les \u00e9mergences d'Epitheca bimaculata se produisent le matin, et lorsque l'on arrive \u00e0 midi, heure de cette photo, les sujets \"sains\" ont d\u00e9j\u00e0 d\u00e9coll\u00e9 et il ne reste \u00e0 l'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'est d'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'aspect de l'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'absence de la classique coloration verte des imagos de la famille des Corduliidae, la pr\u00e9sence \u00e0 la base de l'aile post\u00e9rieure d'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'aile post\u00e9rieure, ont contribu\u00e9 au fait qu'Epitheca bimaculata aie d'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\">----------------------------------------------------------<\/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'envoler (j'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'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'agit d'ailleurs certainement d'une anomalie survenue lors de l'\u00e9mergence... On sait l'importance de la m\u00e9t\u00e9o sur le succ\u00e8s des \u00e9mergences, le r\u00f4le n\u00e9gatif de la pluie et du vent. S'il n'a pas plu ce 8 mai, le vent \u00e9tait assez fort avec environ 20\u2009\u00b0C vers 16 heures, au moment o\u00f9 j'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'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'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'extr\u00e9mit\u00e9 de l'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'Ain j'ai eu la chance d'observer 6 imagos, une \u00e9mergence compl\u00e8te et de nombreuses exuvies, on ne peut pas dire que j'ai \u00e9t\u00e9 g\u00e2t\u00e9 pour les femelles ; tous les sujets que j'ai vus sont imparfaits et les photos que je vais montrer s'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 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[109,572,55],"tags":[574,580],"class_list":["post-8875","post","type-post","status-publish","format-image","hentry","category-corduliidae-france","category-epitheca-bimaculata","category-france","tag-epitheca-bimaculata","tag-probleme-demergence","post_format-post-format-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Epitheca bimaculata femelles \u00e9mergentes - Mes Libellules<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.meslibellules.fr\/blog\/2021\/05\/17\/epitheca-bimaculata-femelle-emergente\/\" \/>\n<meta property=\"og:locale\" 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