{"id":30462,"date":"2026-08-22T13:16:07","date_gmt":"2026-08-22T11:16:07","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=30462"},"modified":"2026-08-22T13:16:10","modified_gmt":"2026-08-22T11:16:10","slug":"paragomphus-nigroviridis","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2026\/08\/22\/paragomphus-nigroviridis\/","title":{"rendered":"Ghana - Paragomphus nigroviridis \u00a0Cammaerts, 1969"},"content":{"rendered":"\n
\"Paragomphus<\/a>
Paragomphus nigroviridis femelle, Ghana, Ankasa Forest Reserve, 17\/01\/2026<\/figcaption><\/figure>\n\n\n\n

C'est dans la r\u00e9serve d'Ankasa, sur une petite rivi\u00e8re en for\u00eat, tr\u00e8s \u00e0 l'ombre, que j'ai eu la chance de d\u00e9couvrir cette femelle Paragomphus nigroviridis<\/em> \u00e9mergente (Gomphidae). Nous n'avons pas r\u00e9ussi \u00e0 l'identifier sur place, puis l'avons appel\u00e9e Paragomphus serrulatus<\/em>. M'int\u00e9ressant \u00e0 l'esp\u00e8ce pour la mettre sur ce site r\u00e9cemment, j'ai eu un vrai doute ; K.-D. Dijkstra appel\u00e9 \u00e0 l'aide, nous a souhait\u00e9 bonne chance pour parvenir \u00e0 l'identifier !
Alors, j'ai tent\u00e9 ma chance avec la liste partielle des Odonates du Ghana, celle de la for\u00eat d'Atewa, de K.-D. Dijkstra (2013), qui ne compte que quatre esp\u00e8ces ; il n'existe pas de photos de Paragomphus nigroviridis<\/em> sur iNaturalist<\/em> ou observation.org<\/em> et c'est sur ADDO que j'ai trouv\u00e9 mon bonheur. La photo de m\u00e2le et de femelle<\/a> qu'y pr\u00e9sente K.-D. Dijkstra colle bien avec notre sujet.<\/p>\n\n\n\n

\"Paragomphus<\/a>
Paragomphus nigroviridis femelle, Ghana, Ankasa Forest Reserve, 17\/01\/2026<\/figcaption><\/figure>\n\n\n\n

On retrouve en effet cette m\u00eame forme en \"L\" ou de \"7\" sur la partie sup\u00e9rieure du thorax, accompagn\u00e9e lat\u00e9ralement par un petit triangle color\u00e9 (ce que ADDO r\u00e9sume par \"7.\" ) et qui se poursuit plus ou moins bri\u00e8vement vers l'avant par une fine ligne jaune (et que Fraser<\/strong> (1949) qualifie de bande ant\u00e9hum\u00e9rale vestigiale). On observe les m\u00eames deux larges bandes jaunes sur le thorax s\u00e9par\u00e9es par une tr\u00e8s fine. Sur l'abdomen, on constate la pr\u00e9sence d'une tache jaune longue sur la face dorsale du S2, d'une tache unique sur la partie ant\u00e9rieure du 7\u1d49 segment.
Et surtout Cammaerts<\/strong> (1969) \u00e9crit \u00e0 la fin de la description pr\u00e9sentant cette nouvelle esp\u00e8ce : \"On distinguera ais\u00e9ment <\/em>Paragomphus nigroviridis sp. n. des esp\u00e8ces africaines du genre par la pr\u00e9sence d'une nervure transverse basale sous-costale \u00e0 chacune de ses ailes (\u00e9galement chez <\/em>P. abnormis (Karsch<\/strong>, 1890) du <\/em>Cameroun)\u2026\" mais P. abnormis<\/em> montre des motifs thoraciques diff\u00e9rents. J'ai aussi une photo montrant ce d\u00e9tail pour une aile ant\u00e9rieure, mais elle ne vaut pas la peine d'\u00eatre montr\u00e9e.<\/p>\n\n\n\n

\"Paragomphus<\/a>
Paragomphus nigroviridis<\/em> vs P. genei<\/em><\/figcaption><\/figure>\n\n\n\n
<\/div>\n\n\n\n
\"Paragomphus<\/a><\/figure>
\n

Cammaerts (1969) donne une illustration du pt\u00e9rothorax sur lequel on retrouve les \u00e9l\u00e9ments d\u00e9j\u00e0 mentionn\u00e9s. Mais il s'agit d'un m\u00e2le, on peut donc s'attendre \u00e0 certaines diff\u00e9rences pour une femelle, comme notre sujet.
Il nous dit que c'est bien Paragomphus nigroventris que Fraser (1949) d\u00e9crit sous le nom de P. abnormis ; Fraser donne la taille de son abdomen : 32 mm.<\/p>\n<\/div><\/div>\n\n\n\n

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

Je l'ai d\u00e9couverte post\u00e9e sur le tronc d'un arbre de la berge d'une rivi\u00e8re peu profonde en for\u00eat (j'ai les pieds dans l'eau pour faire ces photos), dans une zone sombre, comme en t\u00e9moignent mes photos au flash. Curieusement nous venions de photographier Gomphidia gamblesi<\/em> et nous ne rencontrerons pas d'autres Gomphidae pendant ces deux semaines.
Cet habitat correspond tout \u00e0 fait \u00e0 ce qu'on lit sur ADDO (adapt\u00e9 de Dijkstra & Clausnitzer 2014).<\/p>\n\n\n\n

\"Black-and-Green<\/a>
Paragomphus nigroviridis<\/em> femelle, Ghana, Ankasa Forest Reserve, 17\/01\/2026<\/figcaption><\/figure>\n\n\n\n

Sa distribution s'\u00e9tendrait de la Guin\u00e9e et de la Sierra Leone \u00e0 l'est de la R\u00e9publique d\u00e9mocratique du Congo, atteignant au sud le nord du Gabon avec des lacunes plus ou moins \u00e9tendues au long de ce parcours. Mais quand on voit la carte ADDO<\/em> et le peu de donn\u00e9es certaines, les confusions anciennes, la raret\u00e9 apparente de cette esp\u00e8ce, il y a lieu d'\u00eatre sceptique. Il serait sans doute souhaitable de r\u00e9viser les esp\u00e8ces africaines de ce genre.
IUCN Red List<\/a>.<\/p>\n\n\n\n

\u00c9tymologie Paragomphus nigroviridis<\/span><\/span><\/h2>\n\n\n\n

Le genre\u00a0Paragomphus<\/strong>\u00a0a \u00e9t\u00e9 cr\u00e9\u00e9 par l'entomologiste britannique John Cowley en 1934, pour remplacer le genre Mesogomphus<\/em> (F\u00f6rster, 1906) pr\u00e9occup\u00e9 par un genre de poissons fossiles. Avec le pr\u00e9fixe grec\u00a0para<\/em>, \u00e0 c\u00f4t\u00e9<\/em>,\u00a0le nom de genre choisi montre qu'ils sont tr\u00e8s \u00e9troitement li\u00e9s aux Gomphus<\/em> (Leach, 1815).\u00a0Gomphus<\/em>\u00a0vient d\u2019un mot grec qui signifie\u00a0cheville<\/em>\u00a0ou\u00a0boulon<\/em>, en r\u00e9f\u00e9rence \u00e0 la forme de l\u2019abdomen (de la plupart des esp\u00e8ces), qui ressemble \u00e0 une\u00a0cheville pour assembler les bateaux<\/em>.
Nigroviridis<\/strong> ; Cammaerts n'explique pas ce nom qui vient du latin niger, pour noir, et de viridis<\/em>, pour vert<\/em>. Mais il utilise ces adjectifs \u00e0 de tr\u00e8s nombreuses reprises lors de sa description et en particulier : \"Synthorax orn\u00e9 de dessins verts distincts sur fond noir.\" C'est sans nul doute la coloration de cet odonate qui lui vaut son nom d'esp\u00e8ce. Il prend d'ailleurs en anglais le nom de Black-and-Green Hooktail<\/em>.<\/p>\n\n\n\n

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

Dijkstra, (2013<\/strong>). A Rapid Biological Assessment of the Atewa Range Forest Reserve, Eastern Ghana:137-142. 2013 -\u00a0Checklist of Odonata Recorded from Ghana<\/a>\u00a0- Conservation International.
Dijkstra, K.-D.B. (editor, 2019)<\/strong>.\u00a0African Dragonflies and Damselflies<\/a>\u00a0(ADDO).
Fraser, F.C. (1949)<\/strong>. Gomphidae from the Belgian Congo (order Odonata).<\/a> Revue Zoologie Botanique Africaines, 42, 101-138, p. 119 (Paragomphus abnormis).
Cammaerts, R. (1969)<\/strong>. Paragomphus abnormis (Karsch, 1890) et deux esp\u00e8ces pr\u00e9c\u00e9demment confondues avec ce taxon (Odonata Gomphidae)<\/a>. Bulletin Annales Soci\u00e9t\u00e9 royale d'entomologie de Belgique, 105, 234-248.<\/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":"

C'est dans la r\u00e9serve d'Ankasa, sur une petite rivi\u00e8re en for\u00eat, tr\u00e8s \u00e0 l'ombre, que j'ai eu la chance de d\u00e9couvrir cette femelle Paragomphus nigroviridis \u00e9mergente (Gomphidae). Nous n'avons pas r\u00e9ussi \u00e0 l'identifier sur place, puis l'avons appel\u00e9e Paragomphus serrulatus. M'int\u00e9ressant \u00e0 l'esp\u00e8ce pour la mettre sur ce site r\u00e9cemment, j'ai eu un vrai doute […]<\/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-30462","post","type-post","status-publish","format-image","hentry","category-non-classe-fr","post_format-post-format-image"],"yoast_head":"\nParagomphus nigroviridis - 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