{"id":28528,"date":"2026-02-14T18:36:46","date_gmt":"2026-02-14T17:36:46","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=28528"},"modified":"2026-03-30T10:10:54","modified_gmt":"2026-03-30T08:10:54","slug":"agriocnemis-zerafica","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2026\/02\/14\/agriocnemis-zerafica\/","title":{"rendered":"Ghana – Agriocnemis zerafica \u00a0le Roi, 1915"},"content":{"rendered":"\n
\"Agriocnemis<\/a>
Agriocnemis zerafica m\u00e2le, Ghana, Sakumono lagoon, 12\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Ces photos d’Agriocnemis zerafica, Coenagrionidae, sont les toutes premi\u00e8res du s\u00e9jour, l’occasion de faire mes premi\u00e8res photos d’odonates avec un nouvel APN. Passant d’un \u00ab\u00a0petit capteur\u00a0\u00bb \u00e0 un \u00ab\u00a0full frame\u00a0\u00bb, je n’ai sans doute pas eu le r\u00e9flexe de m’approcher suffisamment. Et \u00e0 ce moment, je pensais avoir affaire \u00e0 A. exilis, tr\u00e8s proche visuellement et que je croyais le plus r\u00e9pandu dans cette r\u00e9gion.
Beaucoup de ces photos sont r\u00e9alis\u00e9es dans la lagune Sakumono<\/a>, dans la banlieu d’ Accra.<\/p>\n\n\n\n

\"Sahel<\/a>
Agriocnemis zerafica m\u00e2le, Ghana, Sakumono lagoon, 12\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Quelques d\u00e9tails bien visibles l’en distinguent, mais il faut cliquer sur les photos, en raison de sa taille : le Roi (1915) nous dit que l’abdomen de la femelle mesure 16 mm, soit \u00e0 peine plus de 20 mm de longueur totale.
Son pronotum n’est pas aussi arrondi que celui de A. exilis, il pr\u00e9sente au contraire un bord post\u00e9rieur presque droit, bris\u00e9 par un petit lobe arrondi et color\u00e9 sur sa marge. Et en fait, comme on le verra plus tard, les femelles ont un pronotum qui est une simple variante de celui-ci.<\/p>\n\n\n\n

\"Agriocnemis<\/a>
Agriocnemis zerafica m\u00e2le, Ghana, Adansi sud, 21\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Bien s\u00fbr ses appendices anaux sont aussi diff\u00e9rents en ce sens qu’ils sont \u00e0 peine visibles tellement ils sont courts ; de plus, le S10 est \u00e9tir\u00e9 vers le haut \u00e0 son extr\u00e9mit\u00e9 distale. <\/p>\n\n\n\n

\n
\"Agriocnemis<\/a><\/figure>\n\n\n\n
\"Agriocnemis<\/a><\/figure>\n
Agriocnemis zerafica m\u00e2le appendices anaux, Ghana, Sakumono lagoon, 12\/01\/2026 – Adansi sud, 21\/01\/2026<\/figcaption><\/figure>\n\n\n\n
<\/div>\n\n\n\n
\"Comparaison<\/a><\/figure>
\n

Comme le Roi d\u00e9crit l’esp\u00e8ce \u00e0 partir d’une femelle, il ne fournit pas de dessin des appendices.

On trouve cependant de nombreux dessins et sch\u00e9mas dans la r\u00e9vision des Agriocnemis africains de Pinhey (1974) et sur les pages de l’ADDO par K-D Dijkstra.
Ci-contre, j’ai, compar\u00e9 \u00e0 partir des ouvrages cit\u00e9s, les pronotums des m\u00e2les et les appendices anaux de A. exilis et de Agriocnemis zerafica ; si Pinhey montre 2 dessins pour A. exilis c’est en raison de sa variabilit\u00e9 sur son immense aire de r\u00e9partition.<\/p>\n<\/div><\/div>\n\n\n\n

<\/div>\n\n\n\n
\n
\"Agriocnemis<\/a><\/figure>\n\n\n\n
\"Sahel<\/a>
<\/figcaption><\/figure>\n
Agriocnemis zerafica m\u00e2le, Ghana, Kamgbunli, 15\/01\/2026 & Adansi sud, 21\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Une autre diff\u00e9rence avec A. exilis est visible ici ; les m\u00e2les prenant de l’\u00e2ge se couvrent d’une pulv\u00e9rulence blanch\u00e2tre sur le thorax et la majeure partie du corps, ce qui ne serait jamais le cas pour A. exilis (ADDO).<\/p>\n\n\n\n

\n
\"Agriocnemis<\/a><\/figure>\n\n\n\n
\"Agriocnemis<\/a><\/figure>\n
Agriocnemis zerafica m\u00e2le, Ghana, Sakumono lagoon, 12\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Il se pla\u00eet sur les eaux stagnantes et majoritairement en milieu temporaire ; comme tous les Agriocnemis, il se dissimule dans la v\u00e9g\u00e9tation \u00e9mergente des bords des pi\u00e8ces d’eau, l\u00e0 o\u00f9 la profondeur d’eau est limit\u00e9e. Ils sont souvent tr\u00e8s peu au-dessus de la surface, ce qui explique la difficult\u00e9 de faire de vrais profils sur lesquels on voit correctement les appendices anaux.<\/p>\n\n\n\n

\n
\"Agriocnemis<\/a><\/figure>\n\n\n\n
\"Sahel<\/a><\/figure>\n
Agriocnemis zerafica m\u00e2le, Ghana, Kamgbunli, 15\/01\/2026 & Adansi sud, 21\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Les femelles sont tr\u00e8s variables car elles subissent une radicale transformation en prenant de l’\u00e2ge. Aussi, la seule solution pour les identifier est encore une fois de se fier \u00e0 leur pronotum.<\/p>\n\n\n\n

\n
\"Agriocnemis<\/a><\/figure>\n\n\n\n
\"Agriocnemis<\/a><\/figure>\n
Agriocnemis zerafica femelle, Ghana, Sakumono lagoon, 12\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Et on retrouve tr\u00e8s bien cette forme en \u00ab\u00a0accolade\u00a0\u00bb, avec une pointe aigue au milieu du lobe post\u00e9rieur, que montre Pinhey (1974) dans sa r\u00e9vision.<\/p>\n\n\n\n

<\/div>\n\n\n\n
\"\"<\/a><\/figure>
\n
\"Agriocnemis<\/a>
Agriocnemis zerafica femelle, Ghana, Kamgbunli, 15\/021\/2026<\/figcaption><\/figure>\n<\/div><\/div>\n\n\n\n

Noter le grand nombre d’individus parasit\u00e9s par ces hydracariens (petites boules rouges ou brunes), sans doute du genre Arrenurus, qui s’implantent sur la cuticule au moment de l’\u00e9mergence des libellules, pour se nourrir de leur h\u00e9molymphe ; bien nourris, ils se laisseront tomber dans l’eau pour poursuivre leur cycle de vie.<\/p>\n\n\n\n

\n
\"Agriocnemis<\/a><\/figure>\n\n\n\n
\"Agriocnemis<\/a><\/figure>\n
Agriocnemis zerafica femelle, Ghana, Sakumono lagoon, 12\/01\/2026 & Kamgbunli, 15\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Sa distribution est \u00e9tendue du sud de la Mauritanie \u00e0 l’ouest, au Soudan et au Sud-Soudan \u00e0 l’est. Il atteint le Gabon et le bassin du Congo au sud. Il re\u00e7oit le nom anglais de Sahel Wisp<\/em>.
IUCN Red List<\/a>.<\/p>\n\n\n\n

\"Sahel<\/a>
Agriocnemis zerafica femelle, Ghana, Adansi sud, 21\/01\/2026<\/figcaption><\/figure>\n\n\n\n

\u00c9tymologie<\/strong>
Agriocnemis<\/strong>, du grec Agrios- sauvage, pour vivant dans les champs<\/em> et knemis<\/em>, qui signifie jambi\u00e8re<\/em> (ou tr\u00e8s exactement cnemide<\/em> qui est la protection du tibia<\/em> de l’armure grecque), comme pour nos Platycnemis europ\u00e9ens. Selys croyait les genres \u00e9troitement proches au regard des tibias, ce que je ne constate absolument pas. Ceux des Agriocnemis ne me semblent pas plus larges que ceux des autres Coenagrion. Mais \u00ab cnemis \u00bb dans beaucoup de noms compos\u00e9s de genre doit plut\u00f4t \u00eatre compris comme \u00ab faisant partie des Coenagrionidae \u00bb (voir Endersby & Fliedner (2015)).
Zerafica<\/strong> est une r\u00e9f\u00e9rence \u00e0 Bahr el Zeraf<\/em>, la Rivi\u00e8re des girafes, <\/em>un bras du Nil blanc,<\/em> au Soudan du Sud o\u00f9 a \u00e9t\u00e9 captur\u00e9 l’holotype<\/a> femelle.<\/p>\n\n\n\n

\"Sahel<\/a>
Sahel Wisp female, Ghana, Sakumono lagoon, 12\/01\/2026<\/figcaption><\/figure>\n\n\n\n
<\/div>\n\n\n\n

Dijkstra, K.-D.B (editor ADDO), 2019<\/strong> \u2013 African Dragonflies and Damselflies (ADDO)<\/a> \u2013 Agriocnemis zerafica \u2013 [Le lien peut ne pas fonctionner ; lien web.archive<\/em> \u00e0 partir du site ADDO, maintenant hors ligne.]
Ian Endersby & Heinrich Fliedner<\/strong>, 2015<\/strong> \u2013 The Naming of Australia\u2019s Dragonflies<\/a>, Ian Endersby & Heinrich Fliedner, Busybird publishing.
le Roi, O., 1915<\/strong> – Odonaten aus \u00c4quatorial-Afrika<\/a> – Die zweite deutsche Zentral Afrika Expedition, 319-360. P. 343.
Pinhey, 1974<\/strong> \u2013 A Revision of the African Agriocnemis Selys and Mortonagrion Fraser (Odonata : Coenagrionidae)<\/em> <\/a>\u2013 Occasional papers of the National Museums and Monuments of Rhodesia. [Le lien peut ne pas fonctionner ; lien web.archive<\/em> \u00e0 partir du site ADDO, maintenant hors ligne.]<\/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":"

Ces photos d’Agriocnemis zerafica, Coenagrionidae, sont les toutes premi\u00e8res du s\u00e9jour, l’occasion de faire mes premi\u00e8res photos d’odonates avec un nouvel APN. Passant d’un \u00ab\u00a0petit capteur\u00a0\u00bb \u00e0 un \u00ab\u00a0full frame\u00a0\u00bb, je n’ai sans doute pas eu le r\u00e9flexe de m’approcher suffisamment. Et \u00e0 ce moment, je pensais avoir affaire \u00e0 A. exilis, tr\u00e8s proche visuellement […]<\/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":[38666,38663],"tags":[38667],"class_list":["post-28528","post","type-post","status-publish","format-image","hentry","category-coenagrionidae-ghana","category-ghana","tag-coenagrionidae-ghana","post_format-post-format-image"],"yoast_head":"\nAgriocnemis zerafica - 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