{"id":26664,"date":"2025-11-12T21:22:10","date_gmt":"2025-11-12T20:22:10","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=26664"},"modified":"2025-12-06T09:28:21","modified_gmt":"2025-12-06T08:28:21","slug":"onychargia-atrocyanaen-tandem","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2025\/11\/12\/onychargia-atrocyanaen-tandem\/","title":{"rendered":"Tha\u00eflande – Onychargia atrocyana Selys, 1865"},"content":{"rendered":"\n
\"Onychargia<\/a>
Onychargia atrocyana en tandem, Tha\u00eflande, Wang Bua Ban waterfalls, 26\/05\/2024<\/figcaption><\/figure>\n\n\n\n

Encore Onychargia atrocyana en tandem en tandem et pas de m\u00e2le !
C’est la troisi\u00e8me fois que je rencontre Onychochargia atrocyna ; la premi\u00e8re fois au Cambodge<\/a> pour une femelle, la seconde sur la P\u00e9ninsule Malaise<\/a>, une femelle et un tandem. Et comme on le voit, je n’ai vu que ces deux tandems en Tha\u00eflande.
J’ai donc fini par me demander si j’\u00e9tais malchanceux ou si quelque chose m’emp\u00eachait de voir les m\u00e2les ; car que ce soit pour les Platycnemididae ou les autres zygopt\u00e8res, en g\u00e9n\u00e9ral, on rencontre plus souvent les m\u00e2les que les femelles, qui sont discr\u00e8tes et vivent souvent cach\u00e9es pour \u00e9viter d’\u00eatre harass\u00e9es par les m\u00e2les.
Et en effet, on lit dans A.G. Orr (1) ou dans Ngiam et Ng, que les m\u00e2les se tiennent dans la v\u00e9g\u00e9tation, g\u00e9n\u00e9ralement \u00e0 plusieurs m\u00e8tres du sol. Ils ne sont pas territoriaux (ils ne d\u00e9fendent pas leur territoire) et ne sont donc visibles que lors des actions de reproductions, accouplements et ponte, puisque celle-ci s’accomplit en compagnie du m\u00e2le (ponte endophytique o\u00f9 le m\u00e2le descend parfois partiellement sous l’eau, alors que la femelle peut s’immerger compl\u00e8tement).

Les m\u00e2les matures sont tr\u00e8s sombres, avec des reflets bleu fonc\u00e9 ou violac\u00e9s sur le thorax, et plus lat\u00e9ralement une ligne claire qui dispara\u00eet chez les sujets bien matures comme ici ; il semble tout de m\u00eame difficile de confondre le m\u00e2le avec un autre odonate.
La femelle est par contre tr\u00e8s proche de certaines femelles Coeliccia mais l’extr\u00e9mit\u00e9 de son abdomen est sombre.

Le m\u00e2le mesure 30 \u00e0 32 mm.
Son abdomen est court, ce que diff\u00e9rents auteurs remarquent ; en anglais, il prend le nom de Shorttail<\/em> !<\/p>\n\n\n\n

\"Onychargia<\/a>
Onychargia atrocyana en tandem, Tha\u00eflande, Chiang Mai, Angkaew Reservoir, 08\/06\/2024<\/figcaption><\/figure>\n\n\n\n

Je r\u00e9dige cette page plus d’un an apr\u00e8s ce voyage de prospection pour le mettre en lien avec les m\u00e2les (isol\u00e9s<\/em>) que j’ai enfin observ\u00e9s au Sarawak, \u00e0 Born\u00e9o. Je ne me souviens plus pr\u00e9cis\u00e9ment du biotope de la premi\u00e8re photo, mais tr\u00e8s bien de celui de la seconde : nous sommes juste avant le petit barrage (en haut \u00e0 gauche de la photo) qui ralentit le remplissage des eaux d’un grand r\u00e9servoir du campus de Chiang Mai. Une zone mar\u00e9cageuse s’est form\u00e9e, en limite de for\u00eat, avec une v\u00e9g\u00e9tation pas tr\u00e8s haute, mais tr\u00e8s abondante, dans laquelle les couples (2) tentent de se dissimuler. Croyez-moi, il fait tr\u00e8s chaud, mais de tr\u00e8s nombreuses esp\u00e8ces d’odonates appr\u00e9cient le terrain. Elles sont peut-\u00eatre communes pour les locaux, mais nous avons \u00e9norm\u00e9ment appr\u00e9ci\u00e9 cet endroit pour sa richesse et sa diversit\u00e9 m\u00eame si la configuration des lieux rendait l’approche difficile.

Sa distribution s’\u00e9tend du centre de l’Inde au sud la Chine (Yunnan) et sud, \u00e0 travers la P\u00e9ninsule Malaise et Singapour, jusqu’au Sarawak et Sabah et aux Philippines. J’ai finalement rencontr\u00e9 des m\u00e2les \u00e0 Born\u00e9o, au Sarawak<\/a>.
IUCN Red List<\/a>.<\/p>\n\n\n\n

\"Tha\u00eflande,<\/a>
Tha\u00eflande, barrage du r\u00e9servoir Chiang Mai, 25\/04\/2024<\/figcaption><\/figure>\n\n\n\n

\u00c9tymologie<\/strong>
Onychochargia<\/strong> ; du grec onycho<\/em> qui signifie ongle<\/em> ou griffe<\/em>, et de argia<\/em>, un genre de zygopt\u00e8re sud-am\u00e9ricain (dont le nom avait \u00e9t\u00e9 pr\u00e9c\u00e9demment cr\u00e9\u00e9 comme une variante de –agrion<\/em>). En d\u00e9crivant le sous-genre<\/em> Onychochargia, Selys (3) insiste sur les onglets des tarses (griffes) :\u00a0\u00bbles deux branches des onglets des tarses aussi longues l’une que l’autre\u00a0\u00bb – \u00ab\u00a0Les onglets des tarses tr\u00e8s singuliers comme chez les libellules du genre Macromia\u00a0\u00bb. De plus, il d\u00e9crit ce genre \u00e0 la suite des Argia, pensant qu’il appartient \u00e0 un sous-genre<\/em> de ces derniers (noter d’ailleurs la densit\u00e9 des \u00e9pines des pattes (entre autres) qui rappellent effectivement le genre Argia).
Atrocyana<\/strong>, du latin atrum<\/em> pour noir<\/em> et du grec kuanos<\/em> pour bleu<\/em> sombre. Selys en d\u00e9crivant un sujet tr\u00e8s-adulte<\/em> \u00e9crit :\u00a0\u00bbEn entier d’un noir acier violet sans tache\u00a0\u00bb.<\/p>\n\n\n\n

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

1- A Guide to the Dragonflies of Borneo, their identification and biology. A.G. Orr, Natural History Publication (Borneo) \u2013 2003.
2- Robin Ngiam & Marcus Ng – A photographic guide to the Dragonflies and Damselflies of Singapore – John Beaufoy Publishing \u2013 2022.
3- Selys, 1865 – Synopsis des Agrionines suite 1<\/a> – Bulletins de l\u2019Acad\u00e9mie royale, des lettres et des beaux-arts de Belgique – P. 416.<\/p>\n\n\n\n

<\/div>\n\n\n\n
\n
Accueil Sarawak<\/a><\/div>\n\n\n\n
Listes des Odonates d’Asie<\/a><\/div>\n\n\n\n
Listes continentales<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Encore Onychargia atrocyana en tandem en tandem et pas de m\u00e2le !C’est la troisi\u00e8me fois que je rencontre Onychochargia atrocyna ; la premi\u00e8re fois au Cambodge pour une femelle, la seconde sur la P\u00e9ninsule Malaise, une femelle et un tandem. Et comme on le voit, je n’ai vu que ces deux tandems en Tha\u00eflande.J’ai donc […]<\/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":[1386,1379],"tags":[38563],"class_list":["post-26664","post","type-post","status-publish","format-image","hentry","category-platycnemididae-thailande","category-thailande","tag-platycnemididae-thailande","post_format-post-format-image"],"yoast_head":"\nOnychargia atrocyana en tandem - 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