{"id":5320,"date":"2020-03-29T12:55:04","date_gmt":"2020-03-29T10:55:04","guid":{"rendered":"http:\/\/www.meslibellules.fr\/blog\/?p=5320"},"modified":"2023-08-01T17:15:58","modified_gmt":"2023-08-01T15:15:58","slug":"namibie-orthetrum-stemmale-burmeister-1839","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2020\/03\/29\/namibie-orthetrum-stemmale-burmeister-1839\/","title":{"rendered":"Namibie &#8211; Orthetrum stemmale (Burmeister, 1839)"},"content":{"rendered":"\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/orthetrum-stemmale-male-1.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/orthetrum-stemmale-male-1.jpg\" alt=\"Orthetrum stemmale m\u00e2le, Namibie, Est de Katima Mulilo, 15\/02\/2020\" class=\"wp-image-5315 lazyload\" width=\"493\" height=\"328\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-male-1.jpg 1810w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-male-1-768x511.jpg 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-male-1-1536x1022.jpg 1536w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-male-1-1200x798.jpg 1200w\" data-sizes=\"(max-width: 493px) 100vw, 493px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 493px; --smush-placeholder-aspect-ratio: 493\/328;\" \/><\/a><figcaption class=\"wp-element-caption\">Orthetrum stemmale m\u00e2le, Namibie, Est de Katima Mulilo, 15\/02\/2020<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:15px\">Ici, sur cette mare de la bande de Caprivi, nous sommes tr\u00e8s pr\u00e8s de la Zambie, \u00e0 une centaine de kilom\u00e8tres des chutes Victoria, et si nous avions vu d\u00e9j\u00e0 O. brachiale, cela valait la peine de v\u00e9rifier s&rsquo;il ne se glissait pas quelques Orthetrum stemmale parmi eux. <br><br><em>En octobre 2021, j&rsquo;ai la confirmation lors d&rsquo;un \u00e9change avec Klaas-Douwe Dijkstra de l&rsquo;existence d&rsquo;un crit\u00e8re tr\u00e8s simple pour s\u00e9parer les jeunes O. stemmale des jeunes O. brachiale : les appendices anaux du premier sont clairs (presque blancs), ceux de O. brachiale sont sombres. En vieillissant, ceux de O. stemmale ne deviennent pas noirs, mais prennent la teinte bleue pruineuse de l&rsquo;abdomen, alors que ceux des <span class=\"underline\" style=\"text-decoration: underline\">vieux<\/span> O. brachiale tendent \u00e0 \u00eatre noirs (mais les individus matures ont aussi les appendices anaux bleus&#8230;).<\/em><br><br>Malheureusement, ils sont tr\u00e8s ressemblants et ressemblent aussi \u00e0 O. julia.<br>On s\u00e9pare g\u00e9n\u00e9ralement ce dernier assez facilement par la couleur de ses pt\u00e9rostigmas qui sont sombres, mais malheureusement, il arrive que ceux de O. stemmale le soient aussi, comme on le voit \u00e9galement ci-dessous.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/orthetrum-stemmale-male-4.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/orthetrum-stemmale-male-4.jpg\" alt=\"Orthetrum stemmale m\u00e2le, Namibie, Est de Katima Mulilo, 15\/02\/2020\" class=\"wp-image-5319 lazyload\" width=\"368\" height=\"343\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-male-4.jpg 1291w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-male-4-768x716.jpg 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-male-4-1200x1119.jpg 1200w\" data-sizes=\"(max-width: 368px) 100vw, 368px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 368px; --smush-placeholder-aspect-ratio: 368\/343;\" \/><\/a><figcaption class=\"wp-element-caption\">Orthetrum stemmale m\u00e2le, Namibie, Est de Katima Mulilo, 15\/02\/2020<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:15px\">Comme souvent, il faut avoir recours \u00e0 l&rsquo;examen de l&rsquo;appareil g\u00e9nital secondaire sous le 2\u00b0 segment abdominal; ce qui implique soit de capturer, soit de s&rsquo;approcher tr\u00e8s pr\u00e8s du sujet avec un angle correct&#8230; Ici pas de doute, la forme de l&rsquo;hame\u00e7on correspond \u00e0 celle d&rsquo;O. stemmale, celui de O. julia en est assez \u00e9loign\u00e9 (et n&rsquo;est pas pr\u00e9sent dans la bande de Caprivi).<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/orthetrum-stemmale-secondary-genitalia.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/orthetrum-stemmale-secondary-genitalia.jpg\" alt=\"Orthetrum stemmale m\u00e2le, Namibie, Est de Katima Mulilo, 15\/02\/2020\" class=\"wp-image-5318 lazyload\" width=\"450\" height=\"312\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-secondary-genitalia.jpg 907w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-secondary-genitalia-768x533.jpg 768w\" data-sizes=\"(max-width: 450px) 100vw, 450px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 450px; --smush-placeholder-aspect-ratio: 450\/312;\" \/><\/a><figcaption class=\"wp-element-caption\">Orthetrum stemmale m\u00e2le, Namibie, Est de Katima Mulilo, 15\/02\/2020<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" data-src=\"http:\/\/www.meslibellules.fr\/voyages\/la-reunion\/orthetrum-stemmale\/orthetrum-stemmale-mature\/appendices-anaux-brachiale-stemmale.jpg\" alt=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:15px\">Et puisque j&rsquo;\u00e9tais tr\u00e8s tr\u00e8s pr\u00e8s de ce Bold skimmer, son nom anglais, je ne me suis pas priv\u00e9 de faire une photo de ses yeux qui montrent ses ommatidies (yeux \u00e9l\u00e9mentaires). On note \u00e9galement la posture classique des Libellulidae avec les pattes ant\u00e9rieures repli\u00e9es derri\u00e8re la t\u00eate; on aper\u00e7oit ses <em>genoux<\/em> sous forme d&rsquo;une tache claire.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/orthetrum-stemmale-grosplan.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/orthetrum-stemmale-grosplan.jpg\" alt=\"Orthetrum stemmale m\u00e2le, Namibie, Est de Katima Mulilo, 15\/02\/2020\" class=\"wp-image-5314 lazyload\" width=\"492\" height=\"357\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-grosplan.jpg 1380w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-grosplan-768x559.jpg 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-grosplan-1200x873.jpg 1200w\" data-sizes=\"(max-width: 492px) 100vw, 492px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 492px; --smush-placeholder-aspect-ratio: 492\/357;\" \/><\/a><figcaption class=\"wp-element-caption\">Orthetrum stemmale m\u00e2le, Namibie, Est de Katima Mulilo, 15\/02\/2020<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:15px\">On avance certains autres caract\u00e8res pour diff\u00e9rencier O. stemmale de O. brachiale, en particulier le motif de la partie post\u00e9rieure du thorax qui serait diff\u00e9rent, plus sombre pour O. stemmale et la coloration noire des segments 5 \u00e0 10 qui serait plus \u00e9tendue ou plus compl\u00e8te. Comme d\u00e9j\u00e0 dit les pt\u00e9rostigmas de O. brachiale sont clairs, ceux de O. stemmale <em>peuvent \u00eatre<\/em> sombres. Ceci bien s\u00fbr n&rsquo;est valable que pour les jeunes sujets ou la pruine n&rsquo;a pas encore masqu\u00e9 tous les motifs. A priori, je n&rsquo;ai rien pour montrer qu&rsquo;un des tr\u00e8s nombreux Orthetrum matures bleus que j&rsquo;ai photographi\u00e9s est plus un O. stemmale que brachiale et je pr\u00e9f\u00e8re donc ne pas en montrer.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/orthetrum-stemmale-male-3.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/orthetrum-stemmale-male-3.jpg\" alt=\"Bold skimmer male, Namibie, Est de Katima Mulilo, 15\/02\/2020\" class=\"wp-image-5317 lazyload\" width=\"470\" height=\"289\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-male-3.jpg 1956w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-male-3-768x473.jpg 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-male-3-1536x945.jpg 1536w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-male-3-1200x739.jpg 1200w\" data-sizes=\"(max-width: 470px) 100vw, 470px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 470px; --smush-placeholder-aspect-ratio: 470\/289;\" \/><\/a><figcaption class=\"wp-element-caption\">Orthetrum stemmale m\u00e2le, Namibie, Est de Katima Mulilo, 15\/02\/2020<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:15px\"> Je pr\u00e9cise que toutes les photos de cette page montrent le m\u00eame sujet, prises sur un intervalle de temps de quelques minutes. <br>Il mesure 43 \u00e0 50 mm et se limiterait aux mares, \u00e9tangs et trous d&rsquo;eau, fr\u00e9quentant moins souvent les rivi\u00e8res que son cousin O. brachiale.<br>Juste \u00e0 c\u00f4t\u00e9 de ce m\u00e2le, une femelle portant exactement la m\u00eame livr\u00e9e est tr\u00e8s certainement Orthetrum stemmale \u00e9galement, d&rsquo;autant qu&rsquo;on remarque ses cerco\u00efdes clairs, ceux de O. brachiale seraient toujours sombres\u00a0:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/orthetrum-stemmale-femelle.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/orthetrum-stemmale-femelle.jpg\" alt=\"Orthetrum stemmale femelle, Namibie, Est de Katima Mulilo, 15\/02\/2020\" class=\"wp-image-5313 lazyload\" width=\"444\" height=\"352\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-femelle.jpg 1264w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-femelle-768x610.jpg 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-femelle-1200x953.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\/352;\" \/><\/a><figcaption class=\"wp-element-caption\">Orthetrum stemmale femelle, Namibie, Est de Katima Mulilo, 15\/02\/2020<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:15px\">Il est pr\u00e9sent en Afrique tropicale, du S\u00e9n\u00e9gal \u00e0 l&rsquo;Ethiopie au nord jusqu&rsquo;\u00e0 l&rsquo;est de l&rsquo;Afrique du sud, absent du Botswana et de Namibie, sauf de la bande de Caprivi.<br><a href=\"https:\/\/www.iucnredlist.org\/species\/59964\/85931857\">IUCN Red List<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/orthetrum-stemmale-male-2.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/orthetrum-stemmale-male-2.jpg\" alt=\"Orthetrum stemmale m\u00e2le, Namibie, Est de Katima Mulilo, 15\/02\/2020\" class=\"wp-image-5316 lazyload\" width=\"510\" height=\"310\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-male-2.jpg 1975w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-male-2-768x468.jpg 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-male-2-1536x936.jpg 1536w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/orthetrum-stemmale-male-2-1200x732.jpg 1200w\" data-sizes=\"(max-width: 510px) 100vw, 510px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 510px; --smush-placeholder-aspect-ratio: 510\/310;\" \/><\/a><figcaption class=\"wp-element-caption\">Orthetrum stemmale m\u00e2le, Namibie, Est de Katima Mulilo, 15\/02\/2020<\/figcaption><\/figure>\n\n\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\/blog\/odonates-de-namibie-namibian-odonates\/\">Accueil Namibie<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Ici, sur cette mare de la bande de Caprivi, nous sommes tr\u00e8s pr\u00e8s de la Zambie, \u00e0 une centaine de kilom\u00e8tres des chutes Victoria, et si nous avions vu d\u00e9j\u00e0 O. brachiale, cela valait la peine de v\u00e9rifier s&rsquo;il ne se glissait pas quelques Orthetrum stemmale parmi eux. En octobre 2021, j&rsquo;ai la confirmation lors [&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 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":""},"categories":[278,274],"tags":[276,304],"class_list":["post-5320","post","type-post","status-publish","format-image","hentry","category-libellulidae-namibie-2","category-namibie","tag-odonates-de-namibie-namibian-odonates","tag-orthetrum-stemmale-namibie","post_format-post-format-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - 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