{"id":18202,"date":"2024-02-12T10:22:16","date_gmt":"2024-02-12T09:22:16","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?page_id=18202"},"modified":"2025-12-13T18:01:21","modified_gmt":"2025-12-13T17:01:21","slug":"aeshna-isoceles-isoaeschna-isoceles","status":"publish","type":"page","link":"https:\/\/www.meslibellules.fr\/blog\/aeshna-isoceles-isoaeschna-isoceles\/","title":{"rendered":"Aeshna isoceles &#8211; Isoaeschna isoceles (M\u00fcller, 1767)"},"content":{"rendered":"\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Une publication d&rsquo;ao\u00fbt 2023 a confirm\u00e9 que Aeshna isoceles devrait \u00eatre appel\u00e9 Isoaeschna isoceles ; en effet, dans \u00ab\u00a0<em>Molecular Phylogeny of Holarctic Aeshnidae with a Focus on the West Palaearctic and Some Remarks on Its Genera Worldwide (Aeshnidae, Odonata)<\/em>\u00a0\u00bb (1), on lit que cette esp\u00e8ce est seule dans son <a href=\"https:\/\/meslibellules.fr\/pagesweb\/divers\/glossaire.php\">clade<\/a> et qu&rsquo;il s&rsquo;ensuit la cr\u00e9ation d&rsquo;un nouveau genre pour cette seule esp\u00e8ce.<\/p>\n\n\n\n<h5><span style=\"text-decoration: underline;\">Description &#8211; Identification<\/span><\/h5>\n\n\n\n<div class=\"wp-block-media-text is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Aeshna-isoceles-male-acc.webp\"><img decoding=\"async\" width=\"1108\" height=\"1204\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Aeshna-isoceles-male-acc.webp\" alt=\"Aeshna isoceles m\u00e2le, Marais du Logit (F-33), 25\/07\/2013\" class=\"wp-image-18204 size-full lazyload\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Aeshna-isoceles-male-acc.webp 1108w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Aeshna-isoceles-male-acc-768x835.webp 768w\" data-sizes=\"(max-width: 1108px) 100vw, 1108px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1108px; --smush-placeholder-aspect-ratio: 1108\/1204;\" \/><\/a><\/figure><div class=\"wp-block-media-text__content\">\n<p>Aeshna \/ Isoaecshna isoceles <strong>m\u00e2le<\/strong> est un magnifique Aeshnidae aux yeux verts, portant une petite barre noire sur le front, au thorax caramel barr\u00e9 de deux bandes jaunes, et \u00e0 l&rsquo;abdomen de la m\u00eame couleur, d\u00e9pourvu des classiques taches lat\u00e9rales color\u00e9es des autres Aeshna. Le segment deux porte un triangle jaune \u00e0 pointe post\u00e9rieure. La base des ailes post\u00e9rieure est l\u00e9g\u00e8rement ambr\u00e9e.<br>Les cerques portent une dent basale visible ci-contre.<br>Il mesure 62 \u00e0 65 mm.<br>On ne peut le confondre qu&rsquo;avec <a href=\"https:\/\/www.meslibellules.fr\/voyages\/suede\/aeshna-grandis\/aeshna-grandis-male\/aeshna-grandis-male1big.jpg\">A. grandis<\/a>, plus sombre, et qui porte des points jaunes ou bleus au long de l&rsquo;abdomen.<br><br>Ci-contre, un m\u00e2le dans le marais du Logis (F-33), 25\/07\/2013<br><\/p>\n<\/div><\/div>\n\n\n\n<div style=\"height:37px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-media-text has-media-on-the-right is-stacked-on-mobile\"><div class=\"wp-block-media-text__content\">\n<p>Les <strong>femelles<\/strong> Aeshna ou Isoaeschna isoceles pr\u00e9sentent le m\u00eame habitus, mais sont  sont plus ternes, montrent des bandes jaunes plus l\u00e9g\u00e8res sur la face lat\u00e9rale du thorax, l&rsquo;abdomen est plus large.<br>Elles ont peu ou pas de tache alaire basale, mais sont parfois orn\u00e9es d&rsquo;une ligne ambr\u00e9e au niveau de la sous-costale de l&rsquo;aile ant\u00e9rieure, entre le nodus et le pt\u00e9rostigma.  <br>Comme pour les m\u00e2les, les pattes sont ocres dans leur partie sup\u00e9rieure, noire plus bas.<br>On pourrait \u00e9galement la confondre avec A. grandis, mais les ailes de <a href=\"https:\/\/www.meslibellules.fr\/voyages\/suede\/aeshna-grandis\/aeshna-grandis-femelle\/aeshna-grandis-femelle-3big.jpg\">cette derni\u00e8re<\/a> sont tr\u00e8s ambr\u00e9es et comme les m\u00e2les de l&rsquo;esp\u00e8ce, elle porte des ponctuations color\u00e9es au long de l&rsquo;abdomen.<br><br>\u00c0 droite, une femelle dans la r\u00e9serve du Pinail (F-86), 02\/06\/2013.<\/p>\n\n\n\n<p><\/p>\n<\/div><figure class=\"wp-block-media-text__media\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Aeshna-isoceles-femelle-acc.webp\"><img decoding=\"async\" width=\"1073\" height=\"1204\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Aeshna-isoceles-femelle-acc.webp\" alt=\"Aeshna isoceles femelle, R\u00e9serve du Pinail (F-86), 02\/06\/2013\" class=\"wp-image-18203 size-full lazyload\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Aeshna-isoceles-femelle-acc.webp 1073w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Aeshna-isoceles-femelle-acc-768x862.webp 768w\" data-sizes=\"(max-width: 1073px) 100vw, 1073px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1073px; --smush-placeholder-aspect-ratio: 1073\/1204;\" \/><\/a><\/figure><\/div>\n\n\n\n<div style=\"height:39px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h5><span style=\"text-decoration: underline;\">Habitat et distribution g\u00e9ographique<\/span><\/h5>\n\n\n\n<p>Aeshna isoceles se rencontre pr\u00e9f\u00e9rentiellement en plaine, presque exclusivement sur les eaux stagnantes bien ensoleill\u00e9es, plus ou moins riches en s\u00e9diments : mares, marais, \u00e9tangs, lacs, tourbi\u00e8res et gravi\u00e8res. Il aime les roseli\u00e8res (Phragmites australis) autour des eaux libres, car ses larves vivent dans leurs racines ou dans celles des Carex ssp, Typha ssp., ou Stratiotes aloes dans le nord.<br><br>En France, sa r\u00e9partition est tr\u00e8s in\u00e9gale, de la c\u00f4te atlantique en remontant vers les r\u00e9gions Centre Val de Loire et Ile-de-France, il est surtout pr\u00e9sent dans l&rsquo;est, en particulier dans la r\u00e9gion Grand-Est, l&rsquo;est de Rh\u00f4ne-Alpes et la C\u00f4te d&rsquo;Azur.<br><a href=\"https:\/\/atlas-odonates.insectes.org\/odonates-de-france\/aeshna-isoceles\">Atlas dynamique des Odonates de France<\/a><br>Dans le reste du monde, il est distribu\u00e9 essentiellement en Europe, discret en Espagne et au Portugal, il atteint l&rsquo;est de l&rsquo;Angleterre et  l&rsquo;extr\u00eame sud de la Su\u00e8de. Il devient plus commun dans le centre de l&rsquo;Europe pour se rar\u00e9fier \u00e0 l&rsquo;est ou il atteint le sud de l&rsquo;Oural. Il est mentionn\u00e9 au Maroc et tr\u00e8s rare sur les rives nord de la M\u00e9diterran\u00e9e.<br><a href=\"https:\/\/www.iucnredlist.org\/species\/158692\/72305432#geographic-range\">IUCN Red List<\/a><\/p>\n\n\n\n<h5><span style=\"text-decoration: underline;\">P\u00e9riode de vol<\/span><\/h5>\n\n\n\n<p>On l&rsquo;observe en France de d\u00e9but mai \u00e0 septembre avec un pic en juin.<\/p>\n\n\n\n<h5><span style=\"text-decoration: underline;\">Comportement -\u00c9cologie<\/span><\/h5>\n\n\n\n<p>C&rsquo;est un Aeshnidae qui se pose plus souvent que les autres, mais en raison de sa raret\u00e9, il est finalement moins observ\u00e9 perch\u00e9 que les autres&#8230; Pour donner une id\u00e9e de sa population, le site Inaturalist ne rapporte que 20 observations en 2023, 47 pour Aeshna affinis et 249 pour Anax imperator.<br>Les m\u00e2les patrouillent en limite de rive, agressifs avec toutes les autres esp\u00e8ces.<br>Apr\u00e8s l&rsquo;accouplement, les femelles pondent seules dans les v\u00e9g\u00e9taux aquatiques ou les d\u00e9bris v\u00e9g\u00e9taux flottants.<br>C&rsquo;est la seule de nos Aeschne dont les \u0153ufs \u00e9closent l&rsquo;ann\u00e9e de la ponte, en 6 \u00e0 8 semaines, la phase larvaire dure un \u00e0 deux ans.<\/p>\n\n\n\n<h5><span style=\"text-decoration: underline;\">\u00c9tymologie<\/span><\/h5>\n\n\n\n<p><strong>Isoaeschna<\/strong> et form\u00e9 de <em>iso<\/em>, pr\u00e9fixe grec signifiant \u00ab\u00a0<em>\u00e9gal<\/em>\u00a0\u00bb et de <em>Aeshna<\/em>, nom du genre longtemps utilis\u00e9 pour cette esp\u00e8ce. Aeshna est un cas particulier dans l\u2019\u00e9tymologie des noms d\u2019odonates. Il est ici \u00e9crit dans sa version&nbsp;<em>originale<\/em>, et on a en effet, en Europe, l\u2019habitude de l\u2019\u00e9crire sans \u00ab&nbsp;c&nbsp;\u00bb, la version de Fabricius (1775) qui a cr\u00e9\u00e9 le nom de genre Aeshna.<br>On suppose, car il ne l\u2019a pas pr\u00e9cis\u00e9, que Fabricius a form\u00e9 ce nom depuis un mot grec signifiant&nbsp;<em>d\u00e9figurer<\/em>&nbsp;ou&nbsp;<em>ternir<\/em>&nbsp;(pourquoi, c\u2019est une \u00e9nigme) ; mais Fabricius est un latiniste puriste et on ne peut expliquer cette absence de \u00ab&nbsp;c &nbsp;\u00bb que par une erreur de transcription ou une erreur typographique.<br>L\u2019absence de ce \u00ab&nbsp;c&nbsp;\u00bb n\u2019est rest\u00e9e la norme que pour le genre Aeshna&nbsp;<em>dans le langage scientifique<\/em>&nbsp;et tous les autres noms de genre \u00ab&nbsp;compos\u00e9s&nbsp;\u00bb l\u2019ont int\u00e9gr\u00e9, comme Austroaes<strong>c<\/strong>hna en Australie ou Heliaes<strong>c<\/strong>hna en Asie.<br>Et il faut bien noter que ce \u00ab&nbsp;c&nbsp;\u00bb est r\u00e9apparu dans&nbsp;<em>le nom de genre fran\u00e7ais<\/em>, il ne faut pas l\u2019oublier : Aes<strong>c<\/strong>hne bleue ou Aes<strong>c<\/strong>hne des joncs\u2026 Il dispara\u00eet donc dans cette nouvelle version du nom de genre.<br><strong>Isoceles<\/strong>, du latin <em>isosceles<\/em>, qui signifie <em>ayant deux jambes \u00e9gales<\/em>, se r\u00e9f\u00e8re au triangle&#8230; isoc\u00e8le jaune port\u00e9 par le 2\u00b0 segment. D\u00e9cid\u00e9ment cette esp\u00e8ce n&rsquo;a pas de chance avec l&rsquo;orthographe, car M\u00fcller, dont la description est bien s\u00fbr en latin, omet le \u00ab\u00a0s\u00a0\u00bb avant le \u00ab\u00a0c\u00a0\u00bb.<br>\u00c0 ce propos, si vous d\u00e9sirez aller plus loin dans cette enqu\u00eate, je vous invite \u00e0 consulter le Blog extr\u00eamement d\u00e9taill\u00e9 de Jean-Yves Cordier, sur la <a href=\"https:\/\/www.lavieb-aile.com\/2018\/04\/zoonymie-des-odonates-le-nom-aeshna-isoceles-muller-1767.html\">Zoonymie des Odonates<\/a>.<\/p>\n\n\n\n<div style=\"height:46px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.meslibellules.fr\/pagesweb\/aeshnidae\/Aeshna\/aeshna-isoceles\/aeshna-isoceles-male-1.php\">M\u00e2le<\/a><\/div>\n\n\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.meslibellules.fr\/pagesweb\/aeshnidae\/Aeshna\/aeshna-isoceles\/aeshna-isoceles-femelle-1.php\">Femelle<\/a><\/div>\n\n\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.meslibellules.fr\/pagesweb\/aeshnidae\/Aeshna\/aeshna-isoceles\/aeshna-isoceles-accouplement-1.php\">Accouplement<\/a><\/div>\n<\/div>\n\n\n\n<div style=\"height:36px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Il y a bien longtemps que Aeshna iscoceles posait un probl\u00e8me et d\u00e9j\u00e0 Friedrich Ris avait tent\u00e9, il y a pr\u00e8s de 100 ans, de la placer dans le genre Anaciaeshna avec lequel il partage une cr\u00eate transversale sur le ventre de S2. Mais ce n&rsquo;est pas la seule singularit\u00e9 qui le s\u00e9parait des autres Aeshna : l&rsquo;angle anal (partie post\u00e9ro-interne) de l&rsquo;aile post\u00e9rieure est arrondie, absence de marque noire sur le front, les yeux verts sans traces de bleu, une tache alaire basale ambr\u00e9e, l&rsquo;absence de points color\u00e9s au long de l&rsquo;abdomen, et un d\u00e9tail de nervation o\u00f9 les nervures ant\u00e9rieures et post\u00e9rieures du triangle anal sont fusionn\u00e9es sans prolongation ult\u00e9rieure.<br>L&rsquo;\u00e9tude mentionn\u00e9e ne prouve pas d&rsquo;affinit\u00e9s avec le genre Anaciaeshna ou avec la proposition plus r\u00e9cente de l&rsquo;int\u00e9grer au genre Andaeschna.<\/p>\n\n\n\n<p style=\"font-size:13px\">1- Schneider, T.; Vierstraete, A.; Kosterin, O.E.; Ikemeyer, D.; Hu, F.-S.; Snegovaya, N.; Dumont, H.J. <a href=\"https:\/\/www.researchgate.net\/publication\/373328891_Molecular_Phylogeny_of_Holarctic_Aeshnidae_with_a_Focus_on_the_West_Palaearctic_and_Some_Remarks_on_Its_Genera_Worldwide_Aeshnidae_Odonata#fullTextFileContent\">Molecular Phylogeny of Holarctic Aeshnidae with a Focus on the West Palaearctic and Some Remarks on Its GeneraWorldwide (Aeshnidae, Odonata)<\/a>. Diversity 2023, 15, 950.<br>https:\/\/doi.org\/10.3390\/d15090950<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Une publication d&rsquo;ao\u00fbt 2023 a confirm\u00e9 que Aeshna isoceles devrait \u00eatre appel\u00e9 Isoaeschna isoceles ; en effet, dans \u00ab\u00a0Molecular Phylogeny of Holarctic Aeshnidae with a Focus on the West Palaearctic and Some Remarks on Its Genera Worldwide (Aeshnidae, Odonata)\u00a0\u00bb (1), on lit que cette esp\u00e8ce est seule dans son clade et qu&rsquo;il s&rsquo;ensuit la cr\u00e9ation [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","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":"set","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":""},"class_list":["post-18202","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - 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