{"id":30490,"date":"2026-08-24T19:17:42","date_gmt":"2026-08-24T17:17:42","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=30490"},"modified":"2026-08-24T19:17:45","modified_gmt":"2026-08-24T17:17:45","slug":"cyanothemis-simpsoni","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2026\/08\/24\/cyanothemis-simpsoni\/","title":{"rendered":"Ghana - Cyanothemis simpsoni Ris, 1915"},"content":{"rendered":"\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Cyanothemis-simpsoni-male-1.webp\"><img decoding=\"async\" width=\"1420\" height=\"973\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Cyanothemis-simpsoni-male-1.webp\" alt=\"Cyanothemis simpsoni m\u00e2le, Ghana, Ankasa Forest Reserve, 16\/01\/2026\" class=\"wp-image-30488 lazyload\" style=\"--smush-placeholder-width: 1420px; --smush-placeholder-aspect-ratio: 1420\/973;aspect-ratio:1.4594296597002956;width:540px;height:auto\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Cyanothemis-simpsoni-male-1.webp 1420w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Cyanothemis-simpsoni-male-1-768x526.webp 768w\" data-sizes=\"(max-width: 1420px) 100vw, 1420px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/a><figcaption class=\"wp-element-caption\">Cyanothemis simpsoni m\u00e2le, Ghana, Ankasa Forest Reserve, 16\/01\/2026<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Cyanothemis simpsoni<\/em>, Libellulidae, est une raret\u00e9 qui appartient \u00e0 un genre monosp\u00e9cifique. Je suis d'autant plus d\u00e9\u00e7u de ne pas avoir pu l'approcher correctement qu'il pr\u00e9sente des caract\u00e9ristiques uniques (ce qui est logique puisqu'on a cr\u00e9\u00e9 un genre pour lui) et une coloration \u00e9tonnante.<br>Malheureusement aucun de ces d\u00e9tails sp\u00e9cifiques n'est visible ; en particulier les yeux qui ne se touchent que par un point, ou la derni\u00e8re ant\u00e9nodale de l'aile post\u00e9rieure qui est incompl\u00e8te (ce qui est tr\u00e8s rare parmi les Libellulidae, mais pas unique et semble cependant inconstant (Fleck, 2004)).<br><br>Pour la coloration, nous n'avons pas eu de chance et notre sujet, comme il arrive apparemment assez souvent, ne pr\u00e9sentait pas cette somptueuse coloration bleue que montre <a href=\"https:\/\/inaturalist-open-data.s3.amazonaws.com\/photos\/480473223\/original.jpeg\">le sujet photographi\u00e9<\/a> par K.-D. Dijkstra (mais il y en a d'autres) sur iNaturalist. Il n'y a bien s\u00fbr aucun rapport mais, \u00e0 priori, je ne me souviens pas d'un autre odonate montrant une telle \u00e9tendue de bleu ciel que <em><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Diphlebia-euphoeoides-male-1.webp\">Diphlebia euphoeoides<\/a><\/em> d'Oc\u00e9anie.<br>Cette coloration chez <em>Cyanothemis simpsoni<\/em> n'est pas due \u00e0 une pulv\u00e9rulence bleut\u00e9e comme on le rencontre tr\u00e8s souvent pour les Libellulidae, mais \u00e0 un pigment sous-cuticulaire, ce qui est rarissime dans cette famille.<br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Parmi les singularit\u00e9s de cette esp\u00e8ce, on peut ajouter l'incroyable dimorphisme sexuel ; nous n'avons malheureusement pas rencontr\u00e9 de femelle, mais on en trouve quelques-unes sur <a href=\"https:\/\/inaturalist-open-data.s3.amazonaws.com\/photos\/454767875\/original.jpg\">iNaturalist<\/a> (photo Xavier Rufray).<br><br>L'imago est tr\u00e8s proche des genres <em>Rhodothemis<\/em> et <em>Erythemis<\/em>, la larve \u00e9galement (Fleck, 2014). <br>Le genre <em>Rhodothemis<\/em> est pr\u00e9sent en Indomalaisie et en Australasie alors que les <em>Erythemis<\/em> appartiennent au Nouveau Monde.<br><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" width=\"1533\" height=\"952\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Cyanothemis-simpsoni-male-2.webp\" alt=\"Cyanothemis simpsoni m\u00e2le, Ghana, Ankasa Forest Reserve, 16\/01\/2026\" class=\"wp-image-30489 lazyload\" style=\"--smush-placeholder-width: 1533px; --smush-placeholder-aspect-ratio: 1533\/952;aspect-ratio:1.610352264557872;width:641px;height:auto\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Cyanothemis-simpsoni-male-2.webp 1533w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Cyanothemis-simpsoni-male-2-768x477.webp 768w\" data-sizes=\"(max-width: 1533px) 100vw, 1533px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><figcaption class=\"wp-element-caption\">Cyanothemis simpsoni m\u00e2le, Ghana, Ankasa Forest Reserve, 16\/01\/2026<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Il est difficile de le confondre avec un autre odonate : m\u00eame sur mes pauvres photos, on note l'abdomen bleu sauf les deux derniers segments noirs ; la m\u00eame coloration se poursuit entre les ailes et forme deux larges bandes sur la face dorsale du robuste thorax, du pronotum, et s'\u00e9tend au large triangle occipital et au front. Le reste du thorax est tr\u00e8s sombre. Il pr\u00e9sente une large tache ambr\u00e9e \u00e0 la base des ailes post\u00e9rieures, une beaucoup plus petite aux ant\u00e9rieures.<br>Ris (1915) mesure son abdomen \u00e0 29 mm, il d\u00e9passe sans doute l\u00e9g\u00e8rement les 46 mm.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nous l'avons observ\u00e9 perch\u00e9 au-dessus d'une petite rivi\u00e8re en for\u00eat.<br>Sa distribution s'\u00e9tend de la Sierra Leone et de la Guin\u00e9e \u00e0 la R\u00e9publique d\u00e9mocratique du Congo, son aire couvrant largement le Cameroun, le Gabon et le Congo Brazzaville.<br><a href=\"https:\/\/www.iucnredlist.org\/species\/158556\/5213682\">IUCN Red List<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" style=\"font-size:20px\"><span style=\"text-decoration: underline;\">\u00c9tymologie Cyanothemis simpsoni<\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cyanothemis<\/strong>, du grec <em>k\u00fdanos<\/em> qui signifie <em>bleu<\/em> et de Th\u00e9mis. Ce nom de d\u00e9esse a \u00e9t\u00e9 utilis\u00e9, selon Fliedner (2006), plus de 50 fois, pour nommer des odonates, en particulier des Libellulidae, et ce n\u2019est que justice car \u00ab \u00e9tant la d\u00e9esse de l\u2019ordre, Th\u00e9mis est une tr\u00e8s convenable patronne des taxinomistes.<br><strong>Simpsoni<\/strong> ; Ris explique : \"I have pleasure in naming this beautiful insect after the successful collector of Odonata in Sierra Leone, Dr. J. J. Simpson.\" \"J'ai le plaisir de nommer ce magnifique insecte en l'honneur du Dr J. J. Simpson, qui a r\u00e9colt\u00e9 des odonates avec tant de succ\u00e8s en Sierra Leone.\" Ce Dr Simpson J'ai le plaisir de nommer ce magnifique insecte en l'honneur du Dr J. J. Simpson, qui a r\u00e9colt\u00e9 des odonates avec tant de succ\u00e8s en Sierra Leone.\" Cet entomologiste britannique a parcouru la Gambie, le Nigeria, la C\u00f4te-de-l'Or (Ghana actuel) et la Sierra Leone au d\u00e9but des ann\u00e9es 1910. Son objectif principal \u00e9tait d'\u00e9tudier la distribution des insectes suceurs de sang et vecteurs de maladies (tiques, mouches ts\u00e9-ts\u00e9, moustiques).<\/p>\n\n\n\n<div style=\"height:49px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:13px\"><strong>Fliedner, 2006<\/strong>.\u00a0<a href=\"https:\/\/www.zobodat.at\/pdf\/Virgo_9_I-XXVIII.pdf\">The scientific names of the Odonata in Burmeister\u2019s \"Handbuch der Entomologie\"<\/a><br><strong>G\u00fcnther Fleck (2004)<\/strong>. <a href=\"https:\/\/www.researchgate.net\/publication\/271820133_La_larve_du_genreCyanothemisRis_1915_Odonata_Anisoptera_Libellulidae_Consequences_phylogenetiques#fullTextFileContent\" target=\"_blank\" rel=\"noreferrer noopener\">La larve du genre Cyanothemis Ris, 1915 (Odonata : Anisoptera : Libellulidae). Cons\u00e9quences phylog\u00e9n\u00e9tiques<\/a>, Annales de la Soci\u00e9t\u00e9 entomologique de France, 40:1, 51-58.<br><strong>Ris, F. (1915)<\/strong>. <a href=\"https:\/\/web.archive.org\/web\/20230402102036\/http:\/\/addo.adu.org.za\/pdf\/Ris_1915a.pdf\">New dragonflies (Odonata) of the subfamily Libellulinae from Sierra Leone, W. Africa<\/a>. Annals &amp; Magazine of Natural History, 15, 213-223, p. 219. [Lien via ADDO]<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-buttons is-vertical is-layout-flex wp-container-core-buttons-is-layout-2c90304e 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\/libellules-du-ghana-odonates-of-ghana\/\">Accueil Ghana<\/a><\/div>\n\n\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"http:\/\/www.meslibellules.fr\/pagesweb\/divers\/liste-generale-odonates-du-site\/africa-odonates.php\">Liste africaine<\/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\/blog\/\">Accueil<\/a><\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cyanothemis simpsoni, Libellulidae, est une raret\u00e9 qui appartient \u00e0 un genre monosp\u00e9cifique. Je suis d'autant plus d\u00e9\u00e7u de ne pas avoir pu l'approcher correctement qu'il pr\u00e9sente des caract\u00e9ristiques uniques (ce qui est logique puisqu'on a cr\u00e9\u00e9 un genre pour lui) et une coloration \u00e9tonnante.Malheureusement aucun de ces d\u00e9tails sp\u00e9cifiques n'est visible ; en particulier les [&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":[38663,38664],"tags":[38793],"class_list":["post-30490","post","type-post","status-publish","format-image","hentry","category-ghana","category-libellulidae-ghana-2","tag-libellulidae-ghana","post_format-post-format-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - 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