{"id":26888,"date":"2025-11-26T08:39:21","date_gmt":"2025-11-26T07:39:21","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=26888"},"modified":"2025-12-17T12:57:16","modified_gmt":"2025-12-17T11:57:16","slug":"orthetrum-glaucum","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2025\/11\/26\/orthetrum-glaucum\/","title":{"rendered":"Tha\u00eflande – Orthetrum glaucum (Brauer, 1865)"},"content":{"rendered":"\n
\"Orthetrum<\/a>
Orthetrum glaucum m\u00e2le, Tha\u00eflande, Doi Suthep National Park, 31\/05\/2024<\/figcaption><\/figure>\n\n\n\n

Orthetrum glaucum (Libellulidae) est un odonate commun en Asie tropicale et subtropicale et \u00e0 travers son aire de r\u00e9partition, il a re\u00e7u diff\u00e9rents noms communs, dont Common Blue Skimmer<\/em> ou Blue Marsh Hawk<\/em>.
Je l’ai d\u00e9j\u00e0 rencontr\u00e9 de nombreuses fois, au Laos<\/a>, au Vietnam<\/a>, au Sri Lanka<\/a>, en Malaisie<\/a> (au Sarawak, mais les photos ne sont pas encore sur le site) et si je le montre encore, c’est que j’ai eu l’occasion de faire cette fois-ci des photos d’accouplement (ce qui est toujours rassurant pour mieux identifier les femelles).<\/p>\n\n\n\n

\n
\"Orthetrum<\/a><\/figure>\n\n\n\n
\"Common<\/a><\/figure>\n
Orthetrum glaucum m\u00e2le, Tha\u00eflande, Doi Suthep National Park, 31\/05\/2024 & Mae Klank Waterfall, 02\/06\/2024<\/figcaption><\/figure>\n\n\n\n

L’identification de m\u00e2les adultes ne pose pas vraiment de probl\u00e8me.
Il est enti\u00e8rement bleu pulv\u00e9rulent sauf la face tr\u00e8s sombre et les derniers segments de fa\u00e7on un peu variable. La base des ailes post\u00e9rieures montre une petite zone ambr\u00e9e.
On ne peut gu\u00e8re le confondre qu’avec O. luzonicum<\/a>, \u00e9galement tout bleu quand il est mature, mais dont la base des ailes post\u00e9rieures est hyaline, la face claire et les yeux bleus beaucoup plus clairs.

J’ai eu un peu de mal \u00e0 identifier le jeune m\u00e2le ci-dessous \u00e0 gauche et j’ai demand\u00e9 confirmation sur le groupe Facebook tha\u00eflandais. La confusion pouvait se faire avec O. triangulaire, en raison de la coloration alaire basale, mais l’abdomen est trop fin, s’amincissant rapidement \u00e0 partir du S3.<\/p>\n\n\n\n

\n
\"Orthetrum<\/a><\/figure>\n\n\n\n
\"Orthetrum<\/a><\/figure>\n
Orthetrum glaucum m\u00e2le immature, Tha\u00eflande, Ban Luang, Do Inthanon, 03\/06\/2024 & Siriphum Waterfall, 06\/06\/2024<\/figcaption><\/figure>\n\n\n\n

Les femelles sont beaucoup plus discr\u00e8tes, et c’est la premi\u00e8re fois que je les rencontre pos\u00e9es.
Elles peuvent \u00eatre confondues avec les femelles O. luzonicum et les femelles O. triangulare. Cependant il manque aux premi\u00e8res la bande m\u00e9diane thoracique marron (le thorax est clair) et les bandes claires de la seconde sont plus larges, en particulier la plus ant\u00e9rieure, \u00e9largie vers l’arri\u00e8re dans sa partie haute. J’ai fait un comparatif<\/em><\/strong><\/a> ici.<\/p>\n\n\n\n

\n
\"Orthetrum<\/a><\/figure>\n\n\n\n
\"Orthetrum<\/a><\/figure>\n
Orthetrum glaucum femelle, Tha\u00eflande, Chiang Mai, 27\/05\/2024 & Hua Sai Lueang Waterfall, 04\/06\/2024<\/figcaption><\/figure>\n\n\n\n

Elles sont peut-\u00eatre plus souvent observ\u00e9es en vol, lors de la ponte ou les accouplements.<\/p>\n\n\n\n

\n
\"Orthetrum<\/a><\/figure>\n\n\n\n
\"Orthetrum<\/a><\/figure>\n
Orthetrum glaucum femelle, Tha\u00eflande, Doi Suthep National Park, 31\/05\/2024<\/figcaption><\/figure>\n\n\n\n

Les m\u00e2les ont une longueur totale de 41 \u00e0 46 mm (1), avec un abdomen de 29 \u00e0 35 mm, alors que les femelles sont l\u00e9g\u00e8rement plus petites, 28 \u00e0 32 mm (2). Brauer (3) donne une longueur totale de 47-48 mm.
On les rencontre dans de multiples habitats ; les couples ci-dessous, les femelles ci-dessus et certains des m\u00e2les se trouvaient autour d’un bassin d\u00e9coratif rustique<\/em> et \u00e0 demi abandonn\u00e9 du parc d’un temple. Mais on les trouve le long des foss\u00e9s, pr\u00e8s des mares, des \u00e9tangs forestiers, pour peu que le milieu soit un peu ouvert, des marais et des ruisseaux et rivi\u00e8res.<\/p>\n\n\n\n

\n
\"Orthetrum<\/a><\/figure>\n\n\n\n
\"Common<\/a><\/figure>\n
Orthetrum glaucum m\u00e2le, Tha\u00eflande, Doi Suthep National Park, 31\/05\/2024<\/figcaption><\/figure>\n\n\n\n

Sa distribution est gigantesque ; pr\u00e9sent partout en Inde, du Sri Lanka jusqu’au Japon et, plus au sud, aux Philippines, Born\u00e9o et \u00e0 travers le reste de l’Indon\u00e9sie jusqu’\u00e0 la Nouvelle-Guin\u00e9e.
IUCN Red List<\/a>.

Ci-dessus, m\u00e2le et femelle sont vraiment matures, le m\u00e2le tend vers le gris, la femelle vers le brun fonc\u00e9, les bandes claires de son thorax contrastant fortement sur le fond. Ils se sont tr\u00e8s rapidement s\u00e9par\u00e9s.
J’ai pu m’approcher assez pr\u00e8s d’un autre accouplement, quelques minutes plus tard, sur la margelle du bassin d\u00e9j\u00e0 \u00e9voqu\u00e9 ; un m\u00e2le plus jeune, une femelle sans doute plus \u00e2g\u00e9e, sombre, avec des bandes tr\u00e8s claires.<\/p>\n\n\n\n

\"Orthetrum<\/a>
Orthetrum glaucum accouplement, Tha\u00eflande, Doi Suthep National Park, 31\/05\/2024<\/figcaption><\/figure>\n\n\n\n

\u00c9tymologie<\/strong>
Orthetrum <\/strong>(4) vient de deux mots grecs, orthos<\/em> signifiant \u00ab droit<\/em>  \u00bb et etron<\/em>  \u00ab abdomen<\/em>\u00ab , ceci pour signifier que les c\u00f4t\u00e9s de l\u2019abdomen sont parall\u00e8les. Ce nom de genre (neutre) cr\u00e9\u00e9 par Newman en 1833 a perdu sa pertinence avec la d\u00e9couverte de nouvelles esp\u00e8ces, mais le nom est rest\u00e9.
Glaucum<\/strong>, du latin glaucum<\/em> signifiant bleu ou bleu-vert<\/em>, se rapporte tr\u00e8s vraisemblablement \u00e0 la couleur g\u00e9n\u00e9rale du sp\u00e9cimen d\u00e9tenu par Brauer (3) qui \u00e9crit : Nigro-fusca, coeruleo-pulverulenta, thorace obscur cinereo<\/em> soit brun-noir, bleu-poudre, thorax gris fonc\u00e9, noir-pileux<\/em>, sans oublier que l’individu d\u00e9crit provient sans doute de Ceylan, notre moderne Sri Lanka et n’est pas de premi\u00e8re fra\u00eecheur (les sujets sont dess\u00e9ch\u00e9s et les couleurs sont assombries, perdues ou alt\u00e9r\u00e9es).<\/p>\n\n\n\n

<\/div>\n\n\n\n

1- Robin Ngiam & Marcus Ng – A photographic guide to the Dragonflies and Damselflies of Singapore – John Beaufoy Publishing \u2013 2022
2- Dheerendra Singh , 2022 – Field Guide to the Dragonflies & Damselflies of Northwest india, \u2013 Bishen Singh Mahendra Pal Singh
3- Brauer, 1865 – Zoologisch-Botanische Gesellschaft in Wien. & Kaiserlich-K\u00f6nigliche Zoologisch-Botanische Gesellschaft in Wien. (1858). Verhandlungen der Kaiserlich-K\u00f6niglichen Zoologisch-Botanischen Gesellschaft in Wien (Vol. 15, p. 1013). Kaiserlich-K\u00f6nigliche Zoologisch-Botanische Gesellschaft in Wien<\/a>. P. 1012.
4- The Naming of Australia\u2019s Dragonflies<\/a>, Ian Endersby & Heinrich Fliedner, Busybird publishing.<\/p>\n\n\n\n

<\/div>\n\n\n\n
\n
Accueil Tha\u00eflande<\/a><\/div>\n\n\n\n
Liste Asie<\/a><\/div>\n\n\n\n
Accueil<\/a><\/div>\n<\/div>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Orthetrum glaucum (Libellulidae) est un odonate commun en Asie tropicale et subtropicale et \u00e0 travers son aire de r\u00e9partition, il a re\u00e7u diff\u00e9rents noms communs, dont Common Blue Skimmer ou Blue Marsh Hawk.Je l’ai d\u00e9j\u00e0 rencontr\u00e9 de nombreuses fois, au Laos, au Vietnam, au Sri Lanka, en Malaisie (au Sarawak, mais les photos ne sont […]<\/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":[38544,1379],"tags":[38536],"class_list":["post-26888","post","type-post","status-publish","format-image","hentry","category-libellulidae-thailande-2","category-thailande","tag-libellulidae-thailande","post_format-post-format-image"],"yoast_head":"\nOrthetrum glaucum - 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