{"id":29611,"date":"2026-06-15T06:38:25","date_gmt":"2026-06-15T04:38:25","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=29611"},"modified":"2026-06-15T06:43:14","modified_gmt":"2026-06-15T04:43:14","slug":"pseudagrion-hemicolon","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2026\/06\/15\/pseudagrion-hemicolon\/","title":{"rendered":"Ghana – Pseudagrion hemicolon Karsch, 1899"},"content":{"rendered":"\n
\"Pseudagrion<\/a>
Pseudagrion hemicolon m\u00e2le, Ghana, Kakum National Park, 14\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Pseudagrion hemicolon (Coenagrionidae) fait partie d’un genre immense qui compte actuellement 172 esp\u00e8ces \u00e0 travers l’Afrique, l’Asie et l’Oc\u00e9anie. Ils sont 71 en Afrique r\u00e9partis en 2 groupes et P. hemicolon fait partie du groupe A. On lit sur ADDO (Dijkstra editor) : \u00ab\u00a0Les esp\u00e8ces de Pseudagrion du groupe A<\/em> sont principalement des demoiselles (zygopt\u00e8res) \u00e9lanc\u00e9es, de taille plut\u00f4t petite \u00e0 assez grande (aile post\u00e9rieure de 17 \u00e0 29 mm), de couleur noire avec des touches color\u00e9es sur la t\u00eate, le thorax et les segments abdominaux 7 \u00e0 10<\/em>.\u00a0\u00bb<\/p>\n\n\n\n

\"Pseudagrion<\/a>
Pseudagrion hemicolon m\u00e2le, Ghana, Kakum National Park, 14\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Dix-sept Pseudagrion sont actuellement connus au Ghana, mais il n’est vraiment proche que de P. epiphomenaticum (que nous n’avons pas rencontr\u00e9). Mais il est vraiment tr\u00e8s ressemblant, au point qu’on a d’abord cru qu’il ne s’agissait que d’une seule esp\u00e8ce, mais finalement, et m\u00eame sans les appendices anaux, des diff\u00e9rences de coloration permettent de les s\u00e9parer :
– La face et le vertex de P. epiphomenaticum portent de larges taches jaune clair ; seuls le clypeus, le labre et le surtout labium de P. hemicolon sont jaune sale.
– Les pattes de P. hemicolon sont jaunes<\/em> (il a d’ailleurs aussi \u00e9t\u00e9 d\u00e9crit ult\u00e9rieurement par Sj\u00f6stedt sous le nom de P. flavipes<\/em>), celles de son sosie sont noires.
– La bande ant\u00e9hum\u00e9rale de notre esp\u00e8ce est compl\u00e8te, un peu \u00e9trangl\u00e9e dans sa partie distale, celle de son cousin est souvent tr\u00e8s \u00e9trangl\u00e9e, voire en point d’exclamation (je suppose que Karsch, lorsqu’il fait sa description, a eu en main un sujet un peu variant, comme on peut en rencontrer, avec une bande ant\u00e9hum\u00e9rale interrompue) .
– Enfin le S8 est largement bleu, curieusement encoch\u00e9 pour P. hemicolon, la coloration est moins \u00e9tendue pour P. epiphomenaticum.<\/p>\n\n\n\n

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

On devine \u00e0 peine sur ma photo, sur le cerque gauche (appendice anal sup\u00e9rieur), le crochet rentrant que forme son extr\u00e9mit\u00e9. Mais les cerques de son cousin, bifides, sont tr\u00e8s diff\u00e9rents avec une longue branche interne.<\/p>\n\n\n\n

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

Karsch nous dit que son abdomen mesure 34,3 mm, ce qui donne une longueur totale d’environ 40 mm.
Nous l’avons rencontr\u00e9 en for\u00eat, non loin d’une mare. Cependant il pr\u00e9f\u00e9rerait les ruisseaux en for\u00eat, les suintements, les sources sans refuser les eaux dormantes.<\/p>\n\n\n\n

\"Pseudagrion<\/a>
Pseudagrion hemicolon m\u00e2le, Ghana, Kakum National Park, 14\/01\/2026<\/figcaption><\/figure>\n\n\n\n

On le rencontre de la Guin\u00e9e et de la Sierra Leone jusqu’au Cameroun et au Congo Brazzaville, il devrait \u00eatre pr\u00e9sent au Togo et au B\u00e9nin o\u00f9 il n’a pas encore \u00e9t\u00e9 d\u00e9couvert.
IUCN Red List<\/a>.<\/p>\n\n\n\n

\"Yellow-legged<\/a>
Pseudagrion hemicolon m\u00e2le, Ghana, Ankasa Forest Reserve, 17\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Les Anglo-saxons lui attribuent deux noms, Yellow-legged sprite<\/em> pour ses pattes jaunes, comme on l’a d\u00e9j\u00e0 remarqu\u00e9, et Semicolon Slim Sprite<\/em> qui insiste sur la finesse remarquable de son abdomen (pour un Pseudagrion). Noter \u00e9galement le ratio entre les longueurs respectives du thorax et de l’abdomen, peu commun pour un Pseudagrion : environ 35 mm pour l’abdomen et 5 mm pour le thorax et la t\u00eate.<\/p>\n\n\n\n

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

\u00c9tymologie<\/strong>
Pseudagrion<\/strong>\u00a0(Endersby & Fliedner, 2015) du grec ancien,\u00a0pseudo<\/em>\u00a0\u2013 faux, 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>\u2013\u00a0sauvage<\/em>, vivant dans les champs.
Hemicolon<\/strong> du grec hemi<\/em> pour moiti\u00e9<\/em> et de kolon<\/em> qui d\u00e9signait \u00e0 l’origine un membre du corps<\/em>, puis une partie d’une phrase<\/em>. Mais ce mot en latin scientifique, est le terme technique pour d\u00e9signer le point-virgule. Karsch \u00e9crit : \u00ab\u00a0de chaque c\u00f4t\u00e9 une bande hum\u00e9rale [ant\u00e9hum\u00e9rale] jaune clair de largeur partout assez uniforme, laquelle est bri\u00e8vement interrompue apr\u00e8s le milieu, et ce plus largement \u00e0 l’ext\u00e9rieur qu’\u00e0 l’int\u00e9rieur.\u00a0\u00bb Ce point-virgule est donc utilis\u00e9 pour rappeler la forme de la bande ant\u00e9hum\u00e9rale orange.<\/p>\n\n\n\n

Pseudagrion<\/span> hemicolon m\u00e2le, Ghana, Kakum National Park, 14\/01\/2026<\/span><\/p>\n<\/div><\/div>\n\n\n\n

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

Endersby Ian & Fliedner Heinrich, (2015) <\/strong>. The Naming of Australia\u2019s Dragonflies<\/a>, Ian Endersby & Heinrich Fliedner, Busybird publishing.
Karsch, F. (1899)<\/strong>. Odonaten von Johann-Albrecht-H\u00f6he (Nord- Kamerun), gesammelt von Herrn Leopold Conradt<\/a>. Entomologische Nachrichten, 25, 161-176, p. 168.
Ris, F., et Schmidt, E. (1936)<\/strong>. Die Pseudagrion-Arten des kontinentalen Afrika. (Insecta, Odonata)<\/a>. [posthumous, Schmidt based on Ris’ notes – sp authorship Schmidt] Abhandlungen Senckenbergischen Naturforschenden Gesellschaft, 433, 1-68.
Selys\u00a0(1876)<\/a><\/strong> \u2013 Synopsis des Agrionines, 5\u00b0 L\u00e9gion, Agrion (Suite)<\/a>, p.490.<\/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":"

Pseudagrion hemicolon (Coenagrionidae) fait partie d’un genre immense qui compte actuellement 172 esp\u00e8ces \u00e0 travers l’Afrique, l’Asie et l’Oc\u00e9anie. Ils sont 71 en Afrique r\u00e9partis en 2 groupes et P. hemicolon fait partie du groupe A. On lit sur ADDO (Dijkstra editor) : \u00ab\u00a0Les esp\u00e8ces de Pseudagrion du groupe A sont principalement des demoiselles (zygopt\u00e8res) […]<\/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-29611","post","type-post","status-publish","format-image","hentry","category-coenagrionidae-ghana","category-ghana","tag-coenagrionidae-ghana","post_format-post-format-image"],"yoast_head":"\nGhana - Pseudagrion hemicolon Karsch, 1899 - Mes Libellules<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.meslibellules.fr\/blog\/2026\/06\/15\/pseudagrion-hemicolon\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ghana - Pseudagrion hemicolon Karsch, 1899 - Mes Libellules\" \/>\n<meta property=\"og:description\" content=\"Pseudagrion hemicolon (Coenagrionidae) fait partie d’un genre immense qui compte actuellement 172 esp\u00e8ces \u00e0 travers l’Afrique, l’Asie et l’Oc\u00e9anie. 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