{"id":30432,"date":"2026-08-17T07:03:56","date_gmt":"2026-08-17T05:03:56","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=30432"},"modified":"2026-08-17T07:04:58","modified_gmt":"2026-08-17T05:04:58","slug":"orthetrum-austeni","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2026\/08\/17\/orthetrum-austeni\/","title":{"rendered":"Ghana - Orthetrum austeni (Kirby, 1900)"},"content":{"rendered":"\n
\"Orthetrum<\/a>
Orthetrum austeni m\u00e2le, Ghana, Atewa Forest Reserve, 23\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Orthetrum austeni<\/em>, Libellulidae, n'est pas un des plus difficiles \u00e0 identifier ; c'est d'abord le plus grand et le plus massif de tous les Orthetrum<\/em> (Longfield, 1955) qui sont pourtant nombreux dans le monde puisque le genre compte 72 esp\u00e8ces, dont 36 en Afrique et 15 au Ghana. Selon Kirby (1900), qui l'a d\u00e9crit dans le genre Thermothemis,<\/em> il atteint 54 \u00e0 56 mm de longueur totale et 94 \u00e0 98 mm d'envergure. Son nom anglais est explicite : Giant Skimmer<\/em>.

Son abdomen appara\u00eet cylindrique, \u00e0 peine dilat\u00e9 dans les deux premiers segments (non r\u00e9tr\u00e9ci plus loin), et tr\u00e8s large, ce qui le diff\u00e9rencie de tous les autres Orthetrum, dont O. angustiventre<\/em> (le plus proche) dont la largeur ne d\u00e9passe pas 3 mm. Celui d'Orthetrum austeni<\/em> atteint 4 mm ; la diff\u00e9rence semble minime sur le papier, mais sur le terrain la diff\u00e9rence d'aspect est \u00e9norme, comme on peut le constater ci-dessous ; il s'agit du m\u00eame sujet que sur la photo ci-dessus, d\u00e9vorant un papillon.<\/p>\n\n\n\n

\"Orthetrum<\/a>
Orthetrum austeni m\u00e2le, Ghana, Atewa Forest Reserve, 23\/01\/2026<\/figcaption><\/figure>\n\n\n\n

L'abdomen est brun clair quand ils sont jeunes, il se couvre d'une pulv\u00e9rulence bleut\u00e9e respectant S10 et partiellement S9, qui atteint la base des ailes post\u00e9rieures, l'espace interalaire et reste souvent confin\u00e9e \u00e0 la partie post\u00e9rieure du thorax ; certains sujets voient cependant leur thorax presque compl\u00e8tement envahi de pruine, mais celle-ci reste imparfaite sur la partie ant\u00e9rieure.<\/p>\n\n\n\n

\n
\"Giant<\/a><\/figure>\n\n\n\n
\"Orthetrum<\/a><\/figure>\n
Orthetrum austeni m\u00e2le, Ghana, Kakum N. P., 14\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Les pt\u00e9rostigmas sont longs et la nervation noire (sauf \u00e0 la base de l'aile) est riche et tr\u00e8s dense \u00e0 l'extr\u00e9mit\u00e9 de l'aile. Le champ radial suppl\u00e9mentaire (radial planate<\/em>) compte deux rang\u00e9es de cellules (ce que l'on voit mieux ci-dessus \u00e0 droite), rarement trois.
Les ailes post\u00e9rieures sont plus longues que l'abdomen, respectivement 45-50 mm contre 38-40 mm (Longfield, 1955).
Le thorax est tr\u00e8s peu marqu\u00e9 mais porte une bande ant\u00e9hum\u00e9rale noire incompl\u00e8te en virgule qu'on voit bien ci-dessous \u00e0 droite.<\/p>\n\n\n\n

\n
\"Giant<\/a><\/figure>\n\n\n\n
\"Orthetrum<\/a><\/figure>\n
Orthetrum austeni m\u00e2le, Ghana, Kakum N. P., 14\/01\/2026 & Atewa Forest Reserve, 23\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Kirby donne un curieux d\u00e9tail : \"Male - Rufo-testaceous, thorax with a slight brown line on each shoulder and the borders of the patagia<\/em> black\". Je n'avais jamais rencontr\u00e9 ce patagium<\/a><\/em> tr\u00e8s peu commun (et jamais utilis\u00e9 pour les odonates), ni en anglais, ni en fran\u00e7ais o\u00f9 l'on parle de patagium<\/em> ou patagie<\/em>. Curieusement, Kirby utiliserait ce terme pour ce que nous appelons aujourd'hui membranule<\/a><\/em> et qui, dans cette d\u00e9finition, ne s'applique pourtant qu'aux mammif\u00e8res volants. Cela n'explique pas pourquoi Kirby trouve distinctif que les \"bords des patagia soient noirs\". K.-D. Dijkstra sur ADDO se contente d'\u00e9crire \"membranule sombre plut\u00f4t que p\u00e2le<\/em> [pour O. angustiventre]\".

Les femelles sont \u00e9galement tr\u00e8s grandes et tr\u00e8s massives avec de fortes expansions ventrales sur le S8. Elles montrent \u00e9galement cette bande ant\u00e9hum\u00e9rale sombre en virgule sur un thorax tr\u00e8s peu marqu\u00e9. Les taches claires sur les segments 5 et 6 semblent constantes.<\/p>\n\n\n\n

\"Orthetrum<\/a>
Orthetrum austeni femelle, Ghana, Kakum N. P., 14\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Nous l'avons observ\u00e9 au long de sentiers forestiers sans avoir connaissance de mares \u00e0 proximit\u00e9, si ce n'est de grandes flaques laiss\u00e9es par les pluies des jours pr\u00e9c\u00e9dents notre arriv\u00e9e ; sur l'ADDO<\/a>, on lit qu'il se pla\u00eet sur les eaux stagnantes, parfois temporaires, en zones ouvertes en for\u00eat. Il est peu commun.

Sa distribution (Afrique subsaharienne centrale et occidentale) s'\u00e9tend de la Guin\u00e9e et du Sierra Leone \u00e0 l'ouest \u00e0 l'Ouganda, l'extr\u00eame ouest du Kenya et de la Tanzanie. Au sud, il atteint la Zambie et le nord de l'Angola.
IUCN Red List<\/a>.<\/p>\n\n\n\n

\n
\"Orthetrum<\/a><\/figure>\n\n\n\n
\"Giant<\/a><\/figure>\n
Orthetrum austeni femelle, Ghana, Kakum N. P., 14\/01\/2026<\/figcaption><\/figure>\n\n\n\n

\u00c9tymologie Orthetrum austeni<\/span><\/span><\/h2>\n\n\n\n

Orthetrum<\/em>\u00a0<\/strong>(voir Endersby & Fliedner, 2015) vient de deux mots grecs,\u00a0orthos<\/em>\u00a0signifiant\u00a0droit<\/em>\u00a0et\u00a0etron<\/em>\u00a0pour\u00a0abdomen<\/em>, 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 (dont les c\u00f4t\u00e9s de l'abdomen ne sont pas parall\u00e8les), mais le nom de genre est rest\u00e9.
Austeni<\/em><\/strong> est un hommage de l'auteur \u00e0 Ernest Edward Austen (1867-1938) qui a captur\u00e9 en Sierra Leone 1 m\u00e2le qui est utilis\u00e9, avec d'autres sujets d'Afrique de l'Ouest d\u00e9j\u00e0 en collection, comme mat\u00e9riel \u00e0 la description. C'\u00e9tait un coll\u00e8gue de Kirby au mus\u00e9e d'histoire naturelle de Londres, entomologiste, sp\u00e9cialiste des dipt\u00e8res, qui a collect\u00e9 de nombreux insectes lors de l'exp\u00e9dition Ross au Sierra Leone, exp\u00e9dition destin\u00e9e \u00e0 enqu\u00eater sur le lien entre moustiques et paludisme.<\/p>\n\n\n\n

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

Dijkstra, K.-D.B. (editor, 2024)<\/strong>.\u00a0African Dragonflies and Damselflies<\/a>\u00a0(ADDO).
Endersby Ian & Fliedner Heinrich (2015)<\/strong>.\u00a0The Naming of Australia\u2019s Dragonflies<\/a>. Busybird publishing.
Kirby, W.F. (1900)<\/strong>. Report on the Neuroptera Odonata collected by Mr. E. E. Austen at Sierra Leone during August and September 1899<\/a>. Annals Magazine Natural History, 6, 67-79, p. 72.
Longfield, C. (1955)<\/strong>.\u00a0The Odonata of N. Angola. Part I<\/a>. Publicacoes culturais Companhia Diamantes Angola, 27, 11-63.<\/p>\n\n\n\n

<\/div>\n\n\n\n
\n
Accueil Ghana<\/a><\/div>\n\n\n\n
Liste africaine<\/a><\/div>\n\n\n\n
Accueil<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Orthetrum austeni, Libellulidae, n'est pas un des plus difficiles \u00e0 identifier ; c'est d'abord le plus grand et le plus massif de tous les Orthetrum (Longfield, 1955) qui sont pourtant nombreux dans le monde puisque le genre compte 72 esp\u00e8ces, dont 36 en Afrique et 15 au Ghana. Selon Kirby (1900), qui l'a d\u00e9crit dans […]<\/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":[1290],"tags":[],"class_list":["post-30432","post","type-post","status-publish","format-image","hentry","category-non-classe-fr","post_format-post-format-image"],"yoast_head":"\nOrthetrum austeni - 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