{"id":25298,"date":"2025-06-26T19:08:54","date_gmt":"2025-06-26T17:08:54","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=25298"},"modified":"2025-06-26T19:14:10","modified_gmt":"2025-06-26T17:14:10","slug":"libellago-semiopaca","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2025\/06\/26\/libellago-semiopaca\/","title":{"rendered":"Born\u00e9o – Libellago semiopaca (Selys, 1873)"},"content":{"rendered":"\n
\"Libellago<\/a>
Libellago semiopaca m\u00e2le, Sarawak, Timuoh River, 24\/03\/2025<\/figcaption><\/figure>\n\n\n\n

Ce 24 mars, en fin de matin\u00e9e, lorsque j’aper\u00e7ois ce premier Libellago semiopaca, je ne suis pas habitu\u00e9 au soleil ! Nous sommes partis ce matin de Kuching sous un ciel couvert et surprise, car cela fait 6 jours que nous sommes sous la pluie, le soleil arrive ; mes photos sont souvent assez mal expos\u00e9es. D’autant qu’il n’est pas tr\u00e8s facile \u00e0 photographier, \u00e0 la fois tr\u00e8s sombre et tr\u00e8s clair, noir et jaune, il est tr\u00e8s petit et Selys (1) nous dit que son abdomen mesure 13 mm soit une longueur totale de 20 mm.
Cependant, on lit sur le site eTawau.com<\/a> qu’il mesure 22 mm. La diff\u00e9rence peut para\u00eetre faible, mais repr\u00e9sente tout de m\u00eame 10% de la taille totale, ce qui reste malgr\u00e9 tout largement dans la limite des variations individuelles.
Il faut aussi rappeler que Selys a d\u00e9crit ce sujet depuis un exemplaire mort (et dess\u00e9ch\u00e9) au British Museum (o\u00f9 il s’est rendu), dont la taille a pu varier ; en tout cas, il est tr\u00e8s petit.<\/p>\n\n\n\n

\"Libellago<\/a>
Libellago semiopaca m\u00e2le, Sarawak, Timuoh River, 24\/03\/2025<\/figcaption><\/figure>\n\n\n\n

Il y a plus d’une quinzaine de Chlorocyphidae \u00e0 Born\u00e9o, dont six Libellago (2), nous n’en observerons que 3, mais il est impossible de le confondre avec une autre esp\u00e8ce tant une large partie apicale de ses ailes post\u00e9rieures est macul\u00e9e d’une tache sombre et brillante, pr\u00e9c\u00e9d\u00e9e, dans la zone du nodus de veines discr\u00e8tement iris\u00e9es de rose ou de rouge. Ses pattes sont noires.<\/p>\n\n\n\n

\"Libellago<\/a>
Libellago semiopaca m\u00e2le, Sarawak, Timuoh River, 24\/03\/2025<\/figcaption><\/figure>\n\n\n\n

Ce sont des h\u00f4tes de la for\u00eat, dans des rivi\u00e8res vives et claires de plaine, plus ou moins larges, mais une condition indispensable est la pr\u00e9sence de tronc ou des souches affleurant dans une eau dont le fond est constitu\u00e9 de sable et de graviers. L’esp\u00e8ce est tr\u00e8s exigeante et d\u00e9pendant de ce type de support de ponte, \u00e0 tel point que si les troncs sont submerg\u00e9s, ou au contraire que l’eau n’affleure pas pr\u00e8s de leur sommet, les sujets sont absents de la rivi\u00e8re (3) !

Son aire de distribution est limit\u00e9e \u00e0 Born\u00e9o, Sumatra et la P\u00e9ninsule malaise<\/a>, o\u00f9 je l’avais d\u00e9j\u00e0 rencontr\u00e9 en 2013.

Si on veut les photographier pos\u00e9s, on aura donc toujours le m\u00eame d\u00e9cor de tronc d’arbre et d’eau scintillante !<\/p>\n\n\n\n

\"Libellago<\/a>
Libellago semiopaca m\u00e2le, Sarawak, Timuoh River, 24\/03\/2025<\/figcaption><\/figure>\n\n\n\n

Ils portent sur la face un \u00e9trange appendice, plus ou moins cylindrique de face, mais concave et encoch\u00e9 sur sa face sup\u00e9rieure en haut qui leur donne un dr\u00f4le de museau. Mais il est difficile d’en faire de bonnes photos, car il est sombre sur le fond sombre de la face. Il est commun \u00e0 tous les Chlorocyphidae et je pense que personne n’a de bonnes explications quant \u00e0 son utilit\u00e9, si tant est qu’il en ait une.<\/p>\n\n\n\n

\n
\"Libellago<\/a><\/figure>\n\n\n\n
\"Libellago<\/a><\/figure>\n<\/figure>\n\n\n\n

Les femelles pondent donc sur ces bois immerg\u00e9s (bois durs en g\u00e9n\u00e9ral), juste \u00e0 la limite de l’eau. Elles pr\u00e9sentent les m\u00eames motifs thoraciques, mais n’ont pas de marques alaires. Noter, sous le lourd ovipositeur, le stylet destin\u00e9 \u00e0 percer ce substrat pour y d\u00e9poser un \u0153uf.<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

Les m\u00e2les accompagnent les femelles \u00e0 la ponte, restent quelques instants pos\u00e9s avec elles, mais se lassent vite et repartent trouver une autre compagne… Les femelles en ponte sont alors harcel\u00e9es par des m\u00e2les qui tournent en demi-cercle autour d’elle, exhibant leurs ailes post\u00e9rieures color\u00e9es pour les s\u00e9duire :<\/p>\n\n\n\n

\"Libellago<\/a>
Libellago semiopaca m\u00e2le courtise femelle, Sarawak, Timuoh River, 24\/03\/2025<\/figcaption><\/figure>\n\n\n\n

C’est un spectacle tr\u00e8s amusant \u00e0 voir, les m\u00e2les sont tr\u00e8s rapides, virevoltent, se figent en vol, repartent dans l’autre sens, ne volant parfois que de leurs ailes ant\u00e9rieures, les post\u00e9rieures fixes pour bien montrer leur coloration ! L’abdomen est redress\u00e9 pour les femelles puissent appr\u00e9cier la qualit\u00e9 du motif jaune que porte leur abdomen.<\/p>\n\n\n\n

\"Libellago<\/a>
Libellago semiopaca m\u00e2le courtise femelle, Sarawak, Timuoh River, 24\/03\/2025<\/figcaption><\/figure>\n\n\n\n

Et lorsque plusieurs m\u00e2les sont pr\u00e9sents sur un m\u00eame site de ponte, ils adoptent un comportement territorial et combattent (sans contact) face \u00e0 face ; A. G. Orr (3) \u00e9crit que si, lors de cet exercice un des deux m\u00e2les cesse d’animer ses ailes post\u00e9rieures et n’utilise que les ant\u00e9rieures, exhibant ses bandes alaires sombres, l’adversaire peut \u00eatre perturb\u00e9 et c\u00e8de la place ! Mais de temps en temps, les 2 individus peuvent afficher leurs ailes et si la dur\u00e9e moyenne de ces joutes est d’une douzaine de minutes, elles peuvent atteindre une heure ! Les m\u00e2les passent \u00e9norm\u00e9ment de temps dans ces joutes et dans les vols de s\u00e9duction, y consacrant une \u00e9norme \u00e9nergie !
J’avais observ\u00e9 ce type de combat au Laos avec un autre Chlorocyphidae, Libellago lineata<\/a>, dont la face interne des tibias (comme pour d’autres esp\u00e8ces) est blanche et exhib\u00e9e lors de ces affrontements alors que notre sujet laisse simplement pendre ses pattes sombres.<\/p>\n\n\n\n

\"Libellago<\/a>
Libellago semiopaca,affrontement de m\u00e2les, Sarawak, Timuoh River, 24\/03\/2025<\/figcaption><\/figure>\n\n\n\n

\u00c9tymologie<\/strong>
Libellago<\/strong> ; le genre a \u00e9t\u00e9 cr\u00e9\u00e9 par Selys en 1840 et on pense qu\u2019il est form\u00e9 du latin\u00a0libellula<\/em>\u00a0pour libellule et du suffixe ago<\/em>, sans doute par imitation de la construction du terme virago, qui, en latin, signifie<\/a>\u00a0\u00ab\u00a0femme forte et courageuse comme un homme\u00a0\u00bb et donc \u00e9ventuellement h\u00e9ro\u00efne (vir<\/em> pour homme<\/em> et ago<\/em> = ?<\/em> \u00ab\u00a0.\u00a0Le suffixe -ago, ne semble pourtant pas avoir de signification qui expliquerait la construction des tr\u00e8s rares mots fran\u00e7ais qui l’utilisent. C’est l’explication d\u00e9fendue tr\u00e8s succinctement par Ngiam et Ng (4).
Et j’ai pass\u00e9 de longues heures \u00e0 essayer de confirmer cette hypoth\u00e8se ; et finalement, Selys, dans l’Appendix de sa \u00ab\u00a0Monographie des libellulid\u00e9es d’Europe<\/em>\u00a0\u00bb (5) et plus pr\u00e9cis\u00e9ment dans sa \u00ab\u00a0Note sur le triangle disco\u00efdal des Libellulid\u00e9es<\/em>\u00a0\u00bb \u00e9crit \u00e0 propos du genre Libellago :\u00a0\u00bbCe genre, tr\u00e8s-distinct sous tous les rapports, rappelle certaines Libellules<\/span>. On peut, \u00e0 la rigueur, y d\u00e9couvrir un triangle disco\u00efdal, mais il ne diff\u00e8re pas, par sa construction, des autres cellules carr\u00e9es<\/em>\u00ab\u00a0. Il faut donc bien comprendre Libellago comme \u00ab\u00a0ayant des similitudes avec les Libellules\u00a0\u00bb sur le plan de la nervation.
Plus tard, je me suis aper\u00e7u que cette r\u00e9f\u00e9rence, que j’ai eue tant de mal \u00e0 trouver, est dans Wikipedia<\/a>.
Semiopaca <\/strong>du latin semi<\/em> pour demi, \u00e0 moiti\u00e9\u00a0<\/em>et de opacus<\/em>, qui signifie sombre <\/em>pour souligner l’\u00e9tendue de la zone sombre sur l’aile post\u00e9rieure.

<\/em>Il faut noter que Selys a d\u00e9crit cette esp\u00e8ce dans le genre Micromerus (Rambur, 1842) et que c’est Fraser en 1928 (6) qui a propos\u00e9 que les sujets de ce genre rejoignent le genre Libellago.<\/p>\n\n\n\n

\"Libellago<\/a>
Libellago semiopaca m\u00e2le, Sarawak, Timuoh River, 24\/03\/2025<\/figcaption><\/figure>\n\n\n\n
<\/div>\n\n\n\n

1- Selys, 1873 – Appendice aux troisi\u00e8mes addition au Synopsis des Calopt\u00e9rygines<\/a> – Annales de la Soci\u00e9t\u00e9 entomologique de Belgique (2) 36- P. 617. Un autre lien<\/a>.
2- Dow, 2021 \u2013 AN ANNOTATED CHECKLIST OF THE ODONATA (INSECTA) KNOWN FROM SARAWAK WITH RECORDS TO DISTRICT LEVEL<\/a> \u2013 Sarawak Museum Journal \u00b7 January 2021.
3- A.G. Orr, 2009 – Reproductive behaviour of Libellago semiopacaon a Bornean rainforest stream (Odonata: Chlorocyphidae)<\/a> – International Journal of Odonatology 12 (2) 2009: 157-180; pls I, II.
4- Robin Ngiam & Marcus Ng \u2013 A photographic guide to the Dragonflies and Damselflies of Singapore \u2013 John Beaufoy Publishing \u2013 2022
5- Selys,1840. Monographie des libellulid\u00e9es d’Europe<\/a> – Librairie Encyclop\u00e9dique de Roret. P. 200.
6- Fraser, 1928 – Indian Dragonflies<\/a> – The journal of the Bombay Natural History Society 32, p. 683-684.<\/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":"

Ce 24 mars, en fin de matin\u00e9e, lorsque j’aper\u00e7ois ce premier Libellago semiopaca, je ne suis pas habitu\u00e9 au soleil ! Nous sommes partis ce matin de Kuching sous un ciel couvert et surprise, car cela fait 6 jours que nous sommes sous la pluie, le soleil arrive ; mes photos sont souvent assez mal […]<\/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":[38596,38619],"tags":[38599,38620],"class_list":["post-25298","post","type-post","status-publish","format-image","hentry","category-borneo-sarawak","category-chlorocyphidae-borneo-sarawak","tag-borneo-sarawak","tag-chlorocyphidae-borneo","post_format-post-format-image"],"yoast_head":"\nLibellago semiopaca - 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