{"id":28894,"date":"2026-04-05T18:03:18","date_gmt":"2026-04-05T16:03:18","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=28894"},"modified":"2026-04-05T18:07:36","modified_gmt":"2026-04-05T16:07:36","slug":"allocnemis-elongata","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2026\/04\/05\/allocnemis-elongata\/","title":{"rendered":"Ghana - Allocnemis elongata (Hagen in Selys, 1863)"},"content":{"rendered":"\n
\"Allocnemis<\/a>
Allocnemis elongata m\u00e2le, Ghana, Kakum National Park, 13\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Allocnemis elongata, Platycnemididae, est un des trois de ce genre au Ghana ; mes compagnons qui ont pu poursuivre le s\u00e9jour une semaine de plus vers le nord ont rencontr\u00e9 les deux autres, A. flavipennis et subnodalis<\/em>. Ce sont trois esp\u00e8ces que l'on trouve souvent ensemble ayant vraisemblablement les m\u00eames exigences \u00e9cologiques.
C'est un genre qui comprend actuellement 18 esp\u00e8ces, toutes end\u00e9miques d'Afrique tropicale ; les aventures de la taxonomie ont fait que ce petit genre cr\u00e9\u00e9 par Selys, qui contenait seulement deux esp\u00e8ces, s'est enrichi des Chlorocnemis et des Isomecocnemis gr\u00e2ce \u00e0 Dikstra et al. (2014) . Les auteurs montrent qu'il n'y a pas de diff\u00e9rence g\u00e9n\u00e9tique entre ces genres et la pr\u00e9s\u00e9ance revient au genre Allocnemis cr\u00e9\u00e9 par Selys (1863) dans le m\u00eame document, quelques pages plus haut.<\/p>\n\n\n\n

\"Allocnemis<\/a>
Allocnemis elongata m\u00e2le, Ghana, Kakum National Park, 13\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Au Ghana, on ne peut pas le confondre avec un autre Allocnemis ; A. flavipennis<\/em> montre des pattes toutes noires et des ailes tr\u00e8s fortement ambr\u00e9es, tandis que pour A. subnodalis, l'ensemble des parties claires du thorax, de l'abdomen et des pattes sont bleues.
Il faut remarquer, pour Allocnemis elongata, les pattes tricolores ; la face interne des pattes est orange, les 2\/3 sup\u00e9rieurs des f\u00e9murs blancs et le reste de la patte sombre.<\/p>\n\n\n\n

\n
\"Allocnemis<\/a><\/figure>\n\n\n\n
\"Orange-legged<\/a><\/figure>\n
Allocnemis elongata m\u00e2le, Ghana, Kakum National Park, 13\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Selys nous signale que son abdomen mesure 41 mm, l'insecte entier mesure environ 48 mm.
Son habitat se situe sur les ruisseaux de t\u00eate de bassin, en milieu forestier ; c'est bien dans cet environnement sombre que nous l'avons rencontr\u00e9 dans la for\u00eat de Kakum. <\/p>\n\n\n\n

Dans cet environnement, accompagn\u00e9 de Elattoneura villiersi, nous l'avons observ\u00e9 en tandem et en ponte, mais comme souvent, il est tr\u00e8s difficile d'avoir m\u00e2le et femelle dans le m\u00eame plan de nettet\u00e9\u2026<\/p>\n\n\n\n

\"Allocnemis<\/a>
Allocnemis elongata tandem, Ghana, Kakum National Park, 13\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Les femelles sont donc un peu plus ternes, leurs pattes en particulier ne sont pas orange.<\/p>\n\n\n\n

\n
\"Allocnemis<\/a><\/figure>\n\n\n\n
\"Orange-legged<\/a><\/figure>\n
Allocnemis elongata femelle (\u00e0 gauche) et m\u00e2le (\u00e0 droite) du m\u00eame tandem, Ghana, Kakum National Park, 13\/01\/2026 <\/figcaption><\/figure>\n\n\n\n

Sa distribution s'\u00e9tend de la Guin\u00e9e et de la Sierra Leone au Nigeria. Il n'a cependant pas (encore) \u00e9t\u00e9 d\u00e9couvert au B\u00e9nin (il n'est pas rapport\u00e9 dans le Catalogue illustr\u00e9 des Odonates du B\u00e9nin<\/a><\/em>, Tchibozo et Maes, 2025).<\/p>\n\n\n\n

\n
\"Allocnemis<\/a><\/figure>\n\n\n\n
\"Orange-legged<\/a><\/figure>\n
Allocnemis elongata femelle en ponte, Ghana, Kakum National Park, 13\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Quelques minutes auparavant, nous avions rencontr\u00e9 une femelle qui \u00e9tait rest\u00e9e non identifi\u00e9e ; mais elle pr\u00e9sente exactement les m\u00eames d\u00e9tails de motifs sur le thorax et l'abdomen et il s'agit certainement d'une jeune femelle Allocnemis elongata aux ailes brillantes, encore peu color\u00e9e.
La couleur des ailes est l'occasion de rappeler que le genre est appel\u00e9 Yellowwing en anglais, ce qui s'applique peu ou pas \u00e0 notre esp\u00e8ce. Son nom d'esp\u00e8ce, Orange-legged, est en revanche tr\u00e8s descriptif.<\/p>\n\n\n\n

\"Allocnemis<\/a>
Allocnemis elongata femelle, Ghana, Kakum National Park, 13\/01\/2026<\/figcaption><\/figure>\n\n\n\n

\u00c9tymologie<\/strong> : Allocnemis ellongata
Allocnemis<\/strong>, du grec allos<\/em>, qui signifie autre<\/em>, diff\u00e9rent,<\/em> et de knemis<\/em> qui signifie jambi\u00e8re<\/em> (d'une armure). Dans son Synopsis des Agrionines, Selys d\u00e9crit successivement les Allocnemis, puis les Chlorocnemis et s'il introduit une notion de diff\u00e9rence, c'est qu'il trouve les deux genres tr\u00e8s semblables pour la coloration. Il \u00e9crit : \"Ils imitent par leur coloration les Chlorcnemis de la m\u00eame contr\u00e9e\u2026\". Quant \u00e0 Cnemis,<\/em> qui avait d'abord \u00e9t\u00e9 utilis\u00e9 pour insister sur les caract\u00e8res sp\u00e9cifiques des pattes de certains membres de la famille, il ne faut plus y voir qu'un signe d'appartenance aux Platycnemididae.
Elongata<\/strong> ; du latin elongare<\/em> qui signifie \u00e9tirer<\/em>, allonger<\/em>. Selys d\u00e9crit successivement 2 Allocnemis, Allocnemis elongata et A. flavipennis, mais il fait remarquer que le premier est plus grand :\" Diff\u00e8re de la flavipennis par la taille plus grande\". En effet l'abdomen de la flavipennis<\/em> mesure seulement 33 mm.<\/p>\n\n\n\n

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

Dijkstra, K.-D. B., Kalkman, V. J., Dow, R. A., Stokvis, F. R., & van Tol, J. (2014)<\/strong> - Redefining the damselfly families: a full-lineage molecular phylogeny of Zygoptera (Odonata). Systematic Entomology<\/em>, 39<\/strong>(1), 68\u201396.
Selys, 1863<\/strong> \u2013\u00a0Synopsis des Agrionines, 4\u00b0 L\u00e9gion Platycnemis<\/a>, p 176.<\/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\n\n\n

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

Allocnemis elongata, Platycnemididae, est un des trois de ce genre au Ghana ; mes compagnons qui ont pu poursuivre le s\u00e9jour une semaine de plus vers le nord ont rencontr\u00e9 les deux autres, A. flavipennis et subnodalis. Ce sont trois esp\u00e8ces que l'on trouve souvent ensemble ayant vraisemblablement les m\u00eames exigences \u00e9cologiques.C'est un genre qui […]<\/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 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