{"id":30261,"date":"2026-07-27T13:11:45","date_gmt":"2026-07-27T11:11:45","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=30261"},"modified":"2026-07-27T13:41:57","modified_gmt":"2026-07-27T11:41:57","slug":"pseudagrion-glaucescens","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2026\/07\/27\/pseudagrion-glaucescens\/","title":{"rendered":"Ghana - Pseudagrion glaucescens \u00a0Selys, 1876"},"content":{"rendered":"\n
\"Pseudagrion<\/a>
Pseudagrion glaucescens m\u00e2le, Ghana, Twifo Praso sur la rivi\u00e8re Pra, 20\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Notre premi\u00e8re rencontre avec Pseudagrion glaucescens<\/em> s'est faite sur une large rivi\u00e8re aux berges trop pentues pour tenter de l'approcher. Nous n'avons eu droit qu'\u00e0 cette seule pose, 4 ou 5 m\u00e8tres en dessous de nous.
Il fait partie des 26 Pseudagrion<\/em> du groupe B en Afrique (71 Pseudagrion<\/em> A & B en Afrique, 172 dans le monde !) ; ces Pseudagrion<\/em> se caract\u00e9risent en principe par leur taille petite ou moyenne et leur coloration en g\u00e9n\u00e9ral plus p\u00e2le que ceux du groupe A. Ils se plaisent dans les biotopes chauds, les eaux stagnantes ou temporaires et ont souvent une large distribution.<\/p>\n\n\n\n

\"Pseudagrion<\/a>
Pseudagrion glaucescens m\u00e2le, Ghana, Ejisu sur la rivi\u00e8re Bafo, 21\/01\/2026 <\/figcaption><\/figure>\n\n\n\n

Nous avons un peu h\u00e9sit\u00e9 avant d'identifier Pseudagrion glaucescens<\/em> mais, finalement, nous n'avons pas vu de Pseudagrion<\/em> lui ressemblant, avec cette suture hum\u00e9rale si fine et si peu de marques noires (Longfield, 1936). Pinhey (1961), dans sa cl\u00e9 des Pseudagrion,<\/em> qualifie ces marques thoraciques de vestigiales (\"Black thoracic marking vestigial<\/em>\") et cette caract\u00e9ristique est certainement un bon crit\u00e8re d'identification. Selys mesure son abdomen \u00e0 31 mm, soit une longueur totale de 38 mm.
P. nubicum<\/a> est plus petit (31 mm) et sa suture hum\u00e9rale est beaucoup plus large et grasse. Ils portent cependant tous les 2 un \"U\" ou un diapason<\/em> sur le second segment et un \"x\" noir sur le 10\u1d49.
Il est aussi tr\u00e8s proche de P. torridum<\/a><\/em>, plus petit \u00e9galement (30 \u00e0 34 mm), esp\u00e8ce \u00e9galement pr\u00e9sente au Ghana (mais que nous n'avons pas contact\u00e9e).
Sur le site de l'ADDO<\/a>, K.-D. Dijkstra \u00e9crit qu'il est aussi tr\u00e8s ressemblant \u00e0 P. helenae<\/em>, qui n'est pas pr\u00e9sent au Ghana.

Bien s\u00fbr, la meilleure fa\u00e7on de les diff\u00e9rencier n\u00e9cessite d'examiner les appendices anaux, ce que je ne peux pas montrer pour Pseudagrion glaucescens. Noter cependant ici la face jaune (ou vert-jaune).

Malheureusement, je n'ai pas r\u00e9ussi \u00e0 faire d'autres photos de m\u00e2le seul, si ce n'est une en vue arri\u00e8re, que j'h\u00e9site encore \u00e0 mettre sur le site.
Sur la rivi\u00e8re Bafo<\/em><\/a>, dans une partie large, peu profonde et en milieu ouvert, nous avons contact\u00e9 de nombreuses esp\u00e8ces, dont plusieurs Pseudagrion<\/em>, mais un unique couple de Pseudagrion glaucescens<\/em> en accouplement et en tandem.<\/p>\n\n\n\n

\"Pseudagrion<\/a>
Pseudagrion glaucescens accouplement, Ghana, Ejisu sur la rivi\u00e8re Bafo, 21\/01\/2026 <\/figcaption><\/figure>\n\n\n\n

C'est l'occasion d'observer la femelle dont l'habitus est tr\u00e8s voisin de celui du m\u00e2le, avec des motifs thoraciques, un peu moins marqu\u00e9s, mais identiques.<\/p>\n\n\n\n

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

C'est une esp\u00e8ce de rivi\u00e8re, en milieu ouvert avec des berges suffisamment v\u00e9g\u00e9talis\u00e9es.



On rencontre le Pseudagrion tropical<\/em> (ou le Blue-green Sprite<\/em>, en anglais) du S\u00e9n\u00e9gal au Kenya, au sud et \u00e0 l'est il atteint le Mozambique, \u00e0 l'ouest l'extr\u00eame nord de la Namibie.
IUCN Red List<\/a>.<\/p>\n<\/div><\/div>\n\n\n\n

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

\u00c9tymologie Pseudagrion glaucescens<\/span><\/span><\/h3>\n\n\n\n
<\/div>\n\n\n\n

Pseudagrion<\/strong>\u00a0(Endersby & Fliedner, 2015) du grec ancien,\u00a0pseudo<\/em>\u00a0\u2013\u00a0faux, erron\u00e9,<\/em>\u00a0et d\u2019agrion<\/em>, ceci, comme l\u2019\u00e9crit Selys (1876), pour t\u00e9moigner de la difficult\u00e9 \u00e0 s\u00e9parer ce genre des Agrion ; \u00ab\u00a0les Pseudagrions semblent tr\u00e8s voisins des vrais Agrions\u00a0\u00bb. Agrion, du grec\u00a0Agrios<\/em>\u00a0\u2013\u00a0sauvage<\/em>, vivant dans les champs.

Glaucescens<\/strong> (Suhling & Martens, 2007), du grec glaukos<\/em> pour bleu-vert<\/em> ou gris<\/em> et du suffixe latin -escens<\/em> signifiant devenant<\/em> ou \u00e9tant faible<\/em>, ceci en r\u00e9f\u00e9rence \u00e0 la coloration bleu-verte de cet odonate.<\/p>\n<\/div>

\"Blue-green<\/a><\/figure><\/div>\n\n\n\n
<\/div>\n\n\n\n

Dijkstra, K.-D.B (editor, 2021)<\/strong>.\u00a0African Dragonflies and Damselflies<\/a>\u00a0(ADDO).
Endersby Ian & Fliedner Heinrich, (2015)<\/strong>.\u00a0The Naming of Australia\u2019s Dragonflies<\/a>, Ian Endersby & Heinrich Fliedner, Busybird publishing.
Longfield, C. (1936)<\/strong>. Studies on African Odonata, with synonymy and descriptions of new species and subspecies<\/a>. Transactions Royal Entomological Society London, 85, 467-498, p. 473.
Pinhey, E.C.G. (1961)<\/strong>. Dragonflies (Odonata) of Central Africa<\/a>. Occasional Papers Rhodes-Livingstone Museum, 14, 1-97.
Selys\u00a0(1876)<\/strong>\u00a0\u2013 Synopsis des Agrionines, 5\u1d49 l\u00e9gion, Agrion (suite)<\/a>, p. 498.
Frank Suhling & Andreas Martens (2007)<\/strong>. Dragonflies and Damselflies of Namibia<\/a>. Gamsberg Macmillan.<\/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":"

Notre premi\u00e8re rencontre avec Pseudagrion glaucescens s'est faite sur une large rivi\u00e8re aux berges trop pentues pour tenter de l'approcher. Nous n'avons eu droit qu'\u00e0 cette seule pose, 4 ou 5 m\u00e8tres en dessous de nous.Il fait partie des 26 Pseudagrion du groupe B en Afrique (71 Pseudagrion A & B en Afrique, 172 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":[38666,38663],"tags":[38667],"class_list":["post-30261","post","type-post","status-publish","format-image","hentry","category-coenagrionidae-ghana","category-ghana","tag-coenagrionidae-ghana","post_format-post-format-image"],"yoast_head":"\nPseudagrion glaucescens - 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