{"id":29078,"date":"2026-04-26T08:54:31","date_gmt":"2026-04-26T06:54:31","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=29078"},"modified":"2026-04-26T08:54:32","modified_gmt":"2026-04-26T06:54:32","slug":"ischnura-graellsii-femelle","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2026\/04\/26\/ischnura-graellsii-femelle\/","title":{"rendered":"Ischnura graellsii femelle (Rambur, 1842)"},"content":{"rendered":"\n
\"Ischnura<\/a>
Ischnura graellsii femelle<\/strong> androchrome<\/strong>, Portugal, Lisbonne, 14\/04\/2026<\/figcaption><\/figure>\n\n\n\n

Ischnura graellsii femelle est aussi attrayante que sa cousine I. elegans par les diff\u00e9rentes colorations dont elle se pare, en fonction de son \u00e2ge et de la forme \u00e0 laquelle elle appartient. Elle diff\u00e8re le plus souvent des m\u00e2les par sa coloration et par au moins un d\u00e9tail du motif thoracique : ses bandes ant\u00e9hum\u00e9rales sont nettement plus larges que celles des m\u00e2les, semblables \u00e0 celles des femelles I. elegans.
Une fois matures, ces femelles peuvent \u00eatre :
– androchromes, soit de la m\u00eame couleur que les m\u00e2les, comme ci-dessus. On ne peut alors les distinguer des m\u00e2les que par la largeur de la bande ant\u00e9hum\u00e9rale et bien s\u00fbr, les appendices anaux et l’absence de saillie des appendices g\u00e9nitaux secondaires sous le deuxi\u00e8me segment (S2).
– orange terne, brun-ocre, forme dite aurantiaca<\/em> (une jeune femelle ci-dessous).
– vertes ou ternes<\/em> (brown).<\/p>\n\n\n\n

\n
\"Ischnura<\/a><\/figure>\n\n\n\n
\"Ischnura<\/a><\/figure>\n
Ischnura graellsii : jeune femelle aurantiaca \u00e0 G – femelle verte\/brune \u00e0 F – Portugal, Lisbonne, 14\/04\/2026<\/figcaption><\/figure>\n\n\n\n
<\/div>\n\n\n\n
\"\"<\/a><\/figure>
\n

Ces 3 types de femelles matures sont issus, selon Cordero-Rivera (1990), de 3 formes de femelles immatures comme le montre son graphique ci-contre :
\u2013 Certaines blanch\u00e2tres deviennent bleues (androchromes).
\u2013 D’autres violet-clair<\/em> passant par le vert-olive deviennent brunes.
\u2013 Les derni\u00e8res passent du orange-clair au brun-ocre.

L’ontog\u00e9nie de l’Ischnure magrhib\u00e9rique<\/em> semble donc diff\u00e9rente de celle des femelles de l’I. \u00e9l\u00e9gante dont je montre ici l’\u00e9volution<\/a> et pour lesquelles on n’aurait que deux formes de femelles immatures.
Il est int\u00e9ressant de noter que pour toutes, la couleur finale est atteinte en 9 \u00e0 10 jours.<\/p>\n<\/div><\/div>\n\n\n\n

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

L\u00e0 o\u00f9 j’ai rencontr\u00e9 ces femelles, il n’y a pas de risque de les confondre avec celles d’Ischnura elegans qui sont tr\u00e8s rarement contact\u00e9es, loin \u00e0 l’est, \u00e0 la fronti\u00e8re espagnole. Quand les deux esp\u00e8ces sont susceptibles d’\u00eatre pr\u00e9sentes, s\u00e9parer les esp\u00e8ces n’est possible qu’en examinant le pronotum. Cette comparaison des pronotums, ci-dessous, est issue des dessins que l’on trouve dans le<\/em> Dijkstra et al. (2020).
Attention, sur une vue de profil, le bord post\u00e9rieur est l\u00e9g\u00e8rement<\/em> relev\u00e9, pas autant que celui de I. elegans, mais cela ne simplifie pas\u2026 Voir, en particulier, le pronotum de la femelle verte\/terne ci-dessus.<\/p>\n\n\n\n

\"Pronotum<\/a><\/figure>
\n
\"Ischnura<\/a>
Ischnura graellsii femelle aurantiaca, Portugal, Lisbonne, 14\/04\/2026<\/figcaption><\/figure>\n<\/div><\/div>\n\n\n\n

J’ai surtout rencontr\u00e9 des femelles roses, qui semblaient jeunes, et \u00e9volueraient sans doute vers la forme que Cordero-Rivera qualifie d’infuscans. Elles avaient toutes un S8 partiellement noir ; sauf la derni\u00e8re, en bas \u00e0 droite de cette petite galerie, plut\u00f4t \u00ab\u00a0blanche\u00a0\u00bb (whitish) qui deviendra sans doute androchrome.C’es<\/p>\n\n\n\n

\n
\"Ischnura<\/a>
I<\/figcaption><\/figure>\n\n\n\n
\"Ischnura<\/figure>\n\n\n\n
\"Ischnure<\/figure>\n\n\n\n
\"Ischnura<\/figure>\n<\/figure>\n\n\n\n

C’est toujours un plaisir de rencontrer ces femelles, surtout quand elles sont en nombre et offrent un spectre de couleurs \u00e9tonnant.<\/p>\n\n\n\n

\n
\"Ischnura<\/a><\/figure>\n\n\n\n
\"Ischnure<\/a><\/figure>\n
Ischnura graellsii femelle aurantiaca, Portugal, Lisbonne, 14\/04\/2026<\/figcaption><\/figure>\n\n\n\n
<\/div>\n\n\n\n

Cordero-Rivera A., 1990<\/strong> – The inheritance of female polymorphism in the damselfly Ischnura graellsii (Rambur) (Odonata: Coenagrionidae)<\/a> –  Heredity 64(3):341-346.
Dijkstra, K.-D.B., A. Schr\u00f6ter & R. Lewington. 2020<\/strong> \u2013 Field Guide to the Dragonflies of Britain and Europe. Second edition<\/em>. Bloomsbury Publishing, London.<\/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","protected":false},"excerpt":{"rendered":"

Ischnura graellsii femelle est aussi attrayante que sa cousine I. elegans par les diff\u00e9rentes colorations dont elle se pare, en fonction de son \u00e2ge et de la forme \u00e0 laquelle elle appartient. Elle diff\u00e8re le plus souvent des m\u00e2les par sa coloration et par au moins un d\u00e9tail du motif thoracique : ses bandes ant\u00e9hum\u00e9rales […]<\/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-29078","post","type-post","status-publish","format-image","hentry","category-non-classe-fr","post_format-post-format-image"],"yoast_head":"\nIschnura graellsii femelle - 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