{"id":29048,"date":"2026-04-24T09:24:46","date_gmt":"2026-04-24T07:24:46","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=29048"},"modified":"2026-04-24T09:24:47","modified_gmt":"2026-04-24T07:24:47","slug":"ischnura-graellsii-male","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2026\/04\/24\/ischnura-graellsii-male\/","title":{"rendered":"Ischnura graellsi m\u00e2le (Rambur, 1842)"},"content":{"rendered":"\n
\"Ischnura<\/a>
Ischnura graellsii m\u00e2le, Portugal, Lisbonne, 14\/04\/2026<\/figcaption><\/figure>\n\n\n\n

L'identification discriminative a pour but de s\u00e9parer Ischnura graellsii m\u00e2le d'I. elegans m\u00e2le et ne doit pas poser de probl\u00e8me, avec de bonnes photos ; Comme toujours, il vaut mieux savoir, avant de rencontrer l'esp\u00e8ce, quels sont les crit\u00e8res discriminants afin de tenter de les mettre en valeur :
- des crit\u00e8res secondaires<\/strong>, faciles \u00e0 v\u00e9rifier, comme la finesse ou l'absence de la bande ant\u00e9hum\u00e9rale ; les taches postoculaires absentes ou partielles, ou minuscules ; la coloration verte plut\u00f4t que bleue du thorax.
- des crit\u00e8res structuraux<\/strong> avec bien s\u00fbr les appendices anaux ; la forme du pronotum ; la tub\u00e9rosit\u00e9 du deuxi\u00e8me segment.
- des crit\u00e8res de \"laboratoire\"<\/strong>, comme la longueur des tibias, la largeur et la longueur des ailes, la longueur du thorax, tous ces \u00e9l\u00e9ments \u00e9tant plus petits pour l'Ischnure magrhib\u00e9rique qui est globalement plus petite. Ils n\u00e9cessitent la capture et je ne les d\u00e9velopperai pas, renvoyant le lecteur vers Monetti & al., 2002.<\/p>\n\n\n\n

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

Les taches postoculaires sont ici quasiment absentes, ou r\u00e9duites \u00e0 un point minuscule : n'est-ce pas simplement une poussi\u00e8re ?
La bande ant\u00e9hum\u00e9rale est incompl\u00e8te et tr\u00e8s fine.
La coloration globale du thorax est verte.<\/p>\n<\/div><\/div>\n\n\n\n

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

Le bord post\u00e9rieur du pronotum est faiblement arqu\u00e9 et n'est pas relev\u00e9 ; ce dernier d\u00e9tail est beaucoup plus visible sur une vue de profil. Mais il est toujours d\u00e9licat de montrer l'absence d'un caract\u00e8re...
On voit bien le pronotum redress\u00e9 d'Ischnura elegans sur cette photo<\/a>.<\/p>\n<\/div>

\"Ischnura<\/a><\/figure><\/div>\n\n\n\n
<\/div>\n\n\n\n
\"Pronotum<\/a><\/figure>\n\n\n\n
<\/div>\n\n\n\n
\"Ischnura<\/a><\/figure>
\n

Le plus visible sur le terrain, concernant les appendices anaux, est le fait que les inf\u00e9rieurs, les paraproctes, les plus longs et les plus visibles, sont convergents et non tr\u00e8s visiblement divergents comme pour I. elegans<\/a>.<\/p>\n\n\n\n

\"Ischnure<\/a>
Ischnura graellsii m\u00e2le derniers segments, Portugal, Lisbonne, 14\/04\/2026<\/figcaption><\/figure>\n<\/div><\/div>\n\n\n\n
<\/div>\n\n\n\n

Sur les photos ci-dessous (surtout celle de gauche), on note les pterostigmas bicolores, les ant\u00e9rieurs \u00e9tant plus grands que les post\u00e9rieurs.<\/p>\n\n\n\n

\n
\"Ischnura<\/a><\/figure>\n\n\n\n
\"Ischnure<\/a>
I<\/figcaption><\/figure>\n
Ischnura graellsii m\u00e2le, Portugal, Lisbonne, 14\/04\/2026<\/figcaption><\/figure>\n\n\n\n

Enfin, un m\u00e2le plus jeune, dont le thorax n'est pas encore color\u00e9 ; noter l'absence de taches postoculaires et la bande ant\u00e9hum\u00e9rale incompl\u00e8te.<\/p>\n\n\n\n

\"Ischnura<\/a>
Ischnura graellsii male immature, Portugal, Lisbonne, 14\/04\/2026<\/figcaption><\/figure>\n\n\n\n
<\/div>\n\n\n\n

MONETTI L., SANCHEZ-GUILLEN R.A. & CORDERO-RIVERA A., 2002<\/strong>\u00a0\u2013 Hybridization between Ischnura graellsii (Vander Linden) and I. elegans (Rambur) (Odonata: Coenagrionidae): are they different species? Biological Journal of the Linnean Society 76 (2) : 225-235.
Rambur, Jules, 1842<\/strong>\u00a0\u2013\u00a0Histoire naturelle des insectes. N\u00e9vropt\u00e8res<\/em>\u00a0<\/a>\u2013 Librairie Encyclop\u00e9dique de Roret. P. 275.<\/p>\n\n\n\n

<\/div>\n\n\n\n
\n
Accueil Ischnura graellsii<\/a><\/div>\n\n\n\n
Accueil Odonates de France<\/a><\/div>\n\n\n\n
Accueil<\/a><\/div>\n<\/div>\n\n\n\n

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

L'identification discriminative a pour but de s\u00e9parer Ischnura graellsii m\u00e2le d'I. elegans m\u00e2le et ne doit pas poser de probl\u00e8me, avec de bonnes photos ; Comme toujours, il vaut mieux savoir, avant de rencontrer l'esp\u00e8ce, quels sont les crit\u00e8res discriminants afin de tenter de les mettre en valeur :- des crit\u00e8res secondaires, faciles \u00e0 v\u00e9rifier, […]<\/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":[55,38799],"tags":[],"class_list":["post-29048","post","type-post","status-publish","format-image","hentry","category-france","category-ischnura-graellsii","post_format-post-format-image"],"yoast_head":"\nIschnura graellsii m\u00e2le - 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