{"id":19966,"date":"2024-06-13T18:28:23","date_gmt":"2024-06-13T16:28:23","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=19966"},"modified":"2024-06-14T17:29:41","modified_gmt":"2024-06-14T15:29:41","slug":"triacanthagyna-ditzleri","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2024\/06\/13\/triacanthagyna-ditzleri\/","title":{"rendered":"P\u00e9rou &#8211; Triacanthagyna ditzleri (?) (Williamson, 1923)"},"content":{"rendered":"\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\/Triacanthagyna-ditzleri-male1.webp\"><img decoding=\"async\" width=\"1100\" height=\"1204\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-male1.webp\" alt=\"Triacanthagyna ditzleri m\u00e2le, P\u00e9rou, ARC (Chino), 16\/08\/2023\" class=\"wp-image-19964 size-full lazyload\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-male1.webp 1100w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-male1-768x841.webp 768w\" data-sizes=\"(max-width: 1100px) 100vw, 1100px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1100px; --smush-placeholder-aspect-ratio: 1100\/1204;\" \/><\/a><\/figure><div class=\"wp-block-media-text__content\">\n<p style=\"font-size:15px\">Nous aurions rencontr\u00e9 Triacanthagyna ditzleri \u00e0 3 reprises, m\u00e2le et femelle \u00e0 quelques heures d&rsquo;intervalle le 16 ao\u00fbt puis, \u00e0 nouveau, une femelle, le 19 ao\u00fbt. Enfin, je suppose que c&rsquo;est bien cette esp\u00e8ce et je suis oblig\u00e9 de suivre Tim Faasen qui n&rsquo;a pas, \u00e0 ma connaissance, observ\u00e9 d&rsquo;autre Triacanthagyna dans ses prospections r\u00e9p\u00e9t\u00e9es sur la zone. En effet, 3 esp\u00e8ces, T. carribea, T. satyrus et Triacanthagyna ditzleri pourraient \u00eatre pr\u00e9sentes dans cette zone et sont \u00e0 peu pr\u00e8s indiscernables sur photo, m\u00eame avec de tr\u00e8s bons clich\u00e9s des appendices anaux&#8230;<\/p>\n\n\n\n<p style=\"font-size:13px\">Triacanthagyna ditzleri m\u00e2le, P\u00e9rou, ARC (Chino), 16\/08\/2023<\/p>\n<\/div><\/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 style=\"font-size:15px\">Triacanthagyna ditzleri montre <em>habituellement<\/em> deux rang\u00e9es de cellules (1) (2) \u00e0 la partie ant\u00e9rieure de la boucle anale (<a href=\"https:\/\/www.meslibellules.fr\/thematique\/anat\/ailes\/veination-alaire-3.php\">anal loop<\/a>) qui comporte \u00ab\u00a0normalement\u00a0\u00bb cinq cellules. <a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-male2bis.webp\">Ce m\u00e2le<\/a> montre trois rang\u00e9es de cellules et neuf cellules dans la boucle anale&#8230; <br>Mais Ellenrieder et Garisson (3) ne mentionnent m\u00eame pas ces caract\u00e8res de nervation (souvent variables) dans leur cl\u00e9 qui repose sur les hamules, le lobe g\u00e9nital ou l&rsquo;orientation d&rsquo;une \u00e9ventuelle \u00e9pine sur les cerques&#8230;<\/p>\n\n\n\n<p style=\"font-size:13px\">Triacanthagyna ditzleri m\u00e2le, P\u00e9rou, ARC (Chino), 16\/08\/2023<\/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\/Triacanthagyna-ditzleri-male2.webp\"><img decoding=\"async\" width=\"1259\" height=\"1204\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-male2.webp\" alt=\"Triacanthagyna ditzleri m\u00e2le, P\u00e9rou, ARC (Chino), 16\/08\/2023\" class=\"wp-image-19965 size-full lazyload\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-male2.webp 1259w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-male2-768x734.webp 768w\" data-sizes=\"(max-width: 1259px) 100vw, 1259px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1259px; --smush-placeholder-aspect-ratio: 1259\/1204;\" \/><\/a><\/figure><\/div>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Ce sont des habitants des for\u00eats humides qui montrent une activit\u00e9 essentiellement cr\u00e9pusculaire avec un vol particuli\u00e8rement erratique. Ils ont des yeux \u00e9normes adapt\u00e9s aux environnements \u00e0 faible luminosit\u00e9 avec des ommatidies particuli\u00e8rement d\u00e9velopp\u00e9es. Le reste du temps, ils perchent verticalement, assez bas. <br>Les m\u00e2les mesurent environ 59 mm, ce qui en fait un des plus petits Triacanthagyna.<br>Les femelles pondent dans des mares ou marais dess\u00e9ch\u00e9s, qui se rempliront \u00e0 la saison humide.<\/p>\n\n\n\n<p>Les femelles pr\u00e9sentent des motifs thoraciques et abdominaux similaires \u00e0 ceux des m\u00e2les et sont aussi spectaculaires.<br>Elles montrent en principe de longs appendices anaux sup\u00e9rieurs, aussi longs que les trois derniers segments, qui sont ici certainement cass\u00e9s, comme cela est apparemment fr\u00e9quent.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-femelle-2.webp\"><img decoding=\"async\" width=\"1512\" height=\"1204\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-femelle-2.webp\" alt=\"Triacanthagyna ditzleri femelle, P\u00e9rou, ARC (Chino), 16\/08\/2023\" class=\"wp-image-19962 lazyload\" style=\"--smush-placeholder-width: 1512px; --smush-placeholder-aspect-ratio: 1512\/1204;width:516px;height:auto\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-femelle-2.webp 1512w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-femelle-2-768x612.webp 768w\" data-sizes=\"(max-width: 1512px) 100vw, 1512px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/a><figcaption class=\"wp-element-caption\">Triacanthagyna ditzleri femelle, P\u00e9rou, ARC (Chino), 16\/08\/2023<\/figcaption><\/figure>\n\n\n\n<p>Ces femelles ont \u00e9galement 3 cellules dans la premi\u00e8re rang\u00e9e de la boucle anale qui compte 9 cellules \u00e0 gauche, 10 \u00e0 droite. Ce nombre total de cellules semble tr\u00e8s variable puisque j&rsquo;ai trouv\u00e9 un sujet de Guyane fran\u00e7aise avec effectivement deux rang\u00e9es de cellules \u00e0 la partie ant\u00e9rieure, mais tout de m\u00eame neuf cellules au total.<br><br>La r\u00e9partition de l&rsquo;esp\u00e8ce s&rsquo;\u00e9tend du sud du Mexique au Br\u00e9sil et \u00e0 la Bolivie, et jusqu&rsquo;\u00e0 la Guyane Fran\u00e7aise \u00e0 l&rsquo;est.<br><a href=\"https:\/\/www.iucnredlist.org\/species\/49254261\/49254933\">IUCN Red List<\/a><\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image aligncenter size-full\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-femelle-1.webp\"><img decoding=\"async\" width=\"1162\" height=\"1204\" data-id=\"19961\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-femelle-1.webp\" alt=\"Triacanthagyna ditzleri femelle, P\u00e9rou, ARC (Chino), 16\/08\/2023\" class=\"wp-image-19961 lazyload\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-femelle-1.webp 1162w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-femelle-1-768x796.webp 768w\" data-sizes=\"(max-width: 1162px) 100vw, 1162px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1162px; --smush-placeholder-aspect-ratio: 1162\/1204;\" \/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-femelle-3.webp\"><img decoding=\"async\" width=\"1269\" height=\"1204\" data-id=\"19963\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-femelle-3.webp\" alt=\"Triacanthagyna ditzleri femelle, P\u00e9rou, ARC (Chino), 16\/08\/2023\" class=\"wp-image-19963 lazyload\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-femelle-3.webp 1269w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-ditzleri-femelle-3-768x729.webp 768w\" data-sizes=\"(max-width: 1269px) 100vw, 1269px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1269px; --smush-placeholder-aspect-ratio: 1269\/1204;\" \/><\/a><\/figure>\n<figcaption class=\"blocks-gallery-caption wp-element-caption\">Triacanthagyna ditzleri m\u00e2le, P\u00e9rou, ARC (Chino), 16\/08\/2023 <\/figcaption><\/figure>\n\n\n\n<p><span style=\"text-decoration: underline;\"><strong>\u00c9tymologie<\/strong><\/span><br \/><strong>Triacanthagyna<\/strong> est compos\u00e9 du grec <em>Tri<\/em> , pour &#8211;<em>trois<\/em>, <em>acantha<\/em> pour &#8211;<em>\u00e9pine<\/em> et <em>gyna<\/em> pour &#8211;<em>femme<\/em>. En effet, les femelles de ce genre portent 3 \u00e9pines sous les derniers segments abdominaux, comme le montre le dessin ci-dessous. Selys qui a cr\u00e9\u00e9 le genre en 1883 \u00e9crit : \u201c\u2640. Le 10\u1d49 segment prolong\u00e9 en dessous en une plaque procombante arm\u00e9e de trois pointes aigu\u00ebs assez longues, \u00e9gales, dont les deux lat\u00e9rales un peu \u00e9cart\u00e9es.\u201d<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" width=\"919\" height=\"519\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-obscuripennis-spines-4.webp\" alt=\"Triacanthagyna obscuripennis , spines, (4)\" class=\"wp-image-19987 lazyload\" style=\"--smush-placeholder-width: 919px; --smush-placeholder-aspect-ratio: 919\/519;width:446px;height:auto\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-obscuripennis-spines-4.webp 919w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Triacanthagyna-obscuripennis-spines-4-768x434.webp 768w\" data-sizes=\"(max-width: 919px) 100vw, 919px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><figcaption class=\"wp-element-caption\">Triacanthagyna obscuripennis , exemple d&rsquo;\u00e9pines, (4)<\/figcaption><\/figure>\n\n\n\n<p><strong>ditzleri<\/strong> ; Williamson (2) \u00e9crit : \u00ab\u00a0Named for William Howard Ditzler, who, as a member of the University of Michigan Venezuelan Expedition collected, among many other dragonflies, the type of this handsome species.\u00a0\u00bb &#8211; \u00ab\u00a0Nomm\u00e9 d&rsquo;apr\u00e8s William Howard Ditzler, qui, en tant que membre de l&rsquo;exp\u00e9dition v\u00e9n\u00e9zu\u00e9lienne de l&rsquo;Universit\u00e9 du Michigan, a collect\u00e9 cette belle esp\u00e8ce parmi de nombreuses autres libellules.\u00a0\u00bb<\/p>\n\n\n\n<div style=\"height:31px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p style=\"font-size:13px\">1- Dragonflies and Damselflies of Costa Rica, Dennis Paulson &amp; William Haber, Cornwell University Press, 2021<br>2- Williamson, E.B., 1923. <a href=\"https:\/\/deepblue.lib.umich.edu\/bitstream\/handle\/2027.42\/56254\/MP009.pdf?sequence=1&amp;isAllowed=y\">Notes on American species of Triacanthagyna and Gynacantha<\/a>. Miscellaneus Publications of the Museum of Zoology, University of Michigan, 9: 1-80.<br>3- Natalia von Ellenrieder &amp; Rosser W. Garrison, <a href=\"https:\/\/worlddragonfly.org\/wp-content\/uploads\/ijo\/tijo20.v006.i02\/13887890.2003.9748385\/13887890.2003.9748385.pdf\">Synopsis of the genus Triacanthagyna (Odonata: Aeshnidae)<\/a>, International Journal of Odonatology 6 (2): 147-184, 2003.<br>4- Dragonfly Genera of the New World, An illustrated and annotated key to the Anisoptera, Rosser W. Garrison, Natalia von Ellenrieder, and Jerry A. Louton, The Johns Hopkins University Press, 2006<\/p>\n\n\n\n<div style=\"height:32px\" 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\/blog\/odonates-du-perou-peruvian-odonates\/\">Accueil P\u00e9rou<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Nous aurions rencontr\u00e9 Triacanthagyna ditzleri \u00e0 3 reprises, m\u00e2le et femelle \u00e0 quelques heures d&rsquo;intervalle le 16 ao\u00fbt puis, \u00e0 nouveau, une femelle, le 19 ao\u00fbt. Enfin, je suppose que c&rsquo;est bien cette esp\u00e8ce et je suis oblig\u00e9 de suivre Tim Faasen qui n&rsquo;a pas, \u00e0 ma connaissance, observ\u00e9 d&rsquo;autre Triacanthagyna dans ses prospections r\u00e9p\u00e9t\u00e9es [&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":"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":""},"categories":[1323,1303],"tags":[1324,1305],"class_list":["post-19966","post","type-post","status-publish","format-image","hentry","category-aeshnidae-perou-2","category-perou","tag-aeshnidae-perou","tag-perou","post_format-post-format-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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