{"id":12719,"date":"2023-01-22T19:08:49","date_gmt":"2023-01-22T18:08:49","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?page_id=12719"},"modified":"2026-04-23T10:58:41","modified_gmt":"2026-04-23T08:58:41","slug":"ischnura-elegans-3","status":"publish","type":"page","link":"https:\/\/www.meslibellules.fr\/blog\/ischnura-elegans-3\/","title":{"rendered":"Ischnura elegans (Vander Linden, 1820)"},"content":{"rendered":"\n
\"Ischnura<\/a>
Ischnura elegans m\u00e2le mature, Beaupr\u00e9au (France-49), 29\/07\/2009<\/figcaption><\/figure>\n\n\n\n
Identification – Description<\/span><\/h5>\n\n\n\n

Ischnura elegans est vraiment tr\u00e8s commun en France, sans doute la plus commune de nos libellules. C’est un petit zygopt\u00e8re<\/a>, un Coenagrionidae d’environ 32 mm.
Il montre de petites taches postoculaires rondes et des pt\u00e9rostigmas<\/a> en diamants<\/em>, bicolores, ces deux \u00e9l\u00e9ments \u00e9tant caract\u00e9ristiques du genre, le bord post\u00e9rieur de son pronotum est fortement redress\u00e9, ce qu’on voit tr\u00e8s bien ci-dessous.<\/p>\n\n\n\n

\"Ischnura<\/a>
Ischnura elegans jeune m\u00e2le, pronotum redress\u00e9, Beaupr\u00e9au (F-49), 17\/06\/2016<\/figcaption><\/figure>\n\n\n\n

Les m\u00e2les<\/strong> matures sont uniques pour leur coloration bleue limit\u00e9e \u00e0 la face dorsale de leur 8\u00b0 segment abdominal.<\/strong> Ils ne partagent cette caract\u00e9ristique en France qu’avec I. graellsii<\/a><\/em>, tr\u00e8s peu commun et limit\u00e9 \u00e0 la r\u00e9gion des Pyr\u00e9n\u00e9es. Ischnura pumilio<\/a><\/em>, peu commun, montre un spot unique sur le 9\u00b0<\/strong> segment. Le lobe post\u00e9rieur et m\u00e9dian du pronotum<\/a> est nettement redress\u00e9 en forme de dent<\/a>, le 10\u00b0 segment porte un important tubercule dorsal.
Ischnura elegans m\u00e2le, l’Agrion \u00e9l\u00e9gant en \u00ab\u00a0fran\u00e7ais\u00a0\u00bb est classiquement d\u00e9crit, comme bleu, avec la face dorsale de son abdomen compl\u00e8tement noire, sauf S8, la face inf\u00e9rieure des segments 3 \u00e0 7 plus claire.
Le cas des femelles<\/strong> est plus complexe : il existe deux formes de femelles immatures (l’une bleu lilas, l’autre ros\u00e9e ou orang\u00e9e) qui donnent trois formes de femelles matures qui toutes montrent un spot color\u00e9 sur leur 8\u00b0 segment.<\/p>\n\n\n\n

\"Ischnura<\/a>
Ischnura elegans femelle type B, \u00c9tang de P\u00e9ronne (France-49), 14\/09\/2014<\/figcaption><\/figure>\n\n\n\n
Comportement – \u00c9cologie<\/span><\/h5>\n\n\n\n

M\u00e2les et femelles ne s’\u00e9loignent gu\u00e8re de l’eau, l’accouplement peut \u00eatre tr\u00e8s long, jusqu’\u00e0 sept heures (Steve Brooks, \u00ab\u00a0Dragonflies\u00a0\u00bb) ; s’il est certain que le m\u00e2le passe un certain temps \u00e0 \u00e9liminer ou mettre de c\u00f4t\u00e9 le sperme issu du pr\u00e9c\u00e9dent m\u00e2le s’\u00e9tant accoupl\u00e9 avec sa partenaire, puis \u00e0 transf\u00e9rer son propre sperme dans la bourse et la spermath\u00e8que de la femelle, une bonne partie du temps pass\u00e9 en position de c\u0153ur copulatoire semble occup\u00e9… \u00e0 ne rien faire. Les femelles pondent dans les v\u00e9g\u00e9taux \u00e0 la surface de l’eau sans que le m\u00e2le soit associ\u00e9. Les \u0153ufs \u00e9closent 10 \u00e0 20 jours apr\u00e8s la ponte, la phase larvaire, qui compte 11 stades, dure quelques semaines dans le sud jusqu’\u00e0 deux ans dans le nord de l’Europe ; l’esp\u00e8ce est au moins bivoltine dans une grande partie de notre pays (deux g\u00e9n\u00e9rations par an), et sans doute m\u00eame trivoltine dans le sud, semivoltine<\/a> dans le nord de l’Europe.
Les m\u00e2les, qui ne sont pourtant pas territoriaux, sont tr\u00e8s agressifs et n’h\u00e9sitent pas \u00e0 s’attaquer \u00e0 des zygopt\u00e8res plus grands ou m\u00eame \u00e0 des anisopt\u00e8res qui les d\u00e9rangent. Selon mes recherches et les donn\u00e9es<\/a> que j’ai pu recueillir, si les Ischnura font partie du genre le plus souvent impliqu\u00e9 dans le cannibalisme<\/a>, Ischnura elegans est le champion absolu de ce comportement avec, au 27 mai 2025, 22 cas document\u00e9s, soit 20% de tous les cas de cannibalisme entre zygopt\u00e8res dans le monde.<\/p>\n\n\n\n

P\u00e9riode de vol<\/span><\/h5>\n\n\n\n

L’immense \u00e9tendue de son aire de r\u00e9partition lui fait habiter des climats bien diff\u00e9rents ; il appara\u00eet donc tr\u00e8s t\u00f4t dans le sud, d\u00e8s la mi-mars, ne dispara\u00eet qu’en novembre, mais son pic d’activit\u00e9 se situe entre mai et ao\u00fbt.<\/p>\n\n\n\n

\"Ischnura<\/a>
Ischnura elegans m\u00e2le \u00e9mergent, noter le bord post\u00e9rieur du pronotum, \u00c9tang de P\u00e9ronne (France-49), 23\/07\/2011<\/figcaption><\/figure>\n\n\n\n
Habitat – Distribution g\u00e9ographique<\/span><\/h5>\n\n\n\n

Il accepte presque tous les milieux humides \u00e0 l’exception des eaux acides et des eaux courantes rapides, il tol\u00e8re la salinit\u00e9. On est donc susceptible de le rencontrer d\u00e8s qu’il y a un peu d’eau libre.

Il est pr\u00e9sent partout en France (sauf en Corse o\u00f9 il est remplac\u00e9 par I. genei) et en Europe, jusqu’en Cor\u00e9e du Sud et au Japon. L’Agrion \u00e9l\u00e9gant est cependant absent du sud de l’Espagne et du Portugal o\u00f9 il est remplac\u00e9 par Ischnura graellsii<\/a>.
Il est absent d’Afrique et d’Afrique du Nord, il est signal\u00e9 en Iran et au Pakistan.
Les anglo-saxons le nomment Common Bluetail.
Atlas Dynamique des Odonates de France<\/a>
Liste rouge<\/a> IUCN.<\/p>\n\n\n\n

\u00c9tymologie<\/span><\/h5>\n\n\n\n

Ischnura<\/strong> du grec \u00ab\u00a0ischnos\u00a0\u00bb – fin, et de \u00ab\u00a0ura\u00a0\u00bb – queue<\/em>, soit abdomen pour les insectes. Le genre Ischnura renferme en France, en tout cas, des odonates parmi les plus fins.
Elegans<\/strong> du latin\u2026 \u00ab\u00a0elegans\u00a0\u00bb – \u00e9l\u00e9gant<\/em> est plus \u00e9vident et s’accorde bien \u00e0 la silhouette commune, mais toujours plaisante, de cette petite esp\u00e8ce.<\/p>\n\n\n\n

<\/div>\n\n\n\n
\n
\u00c9mergence m\u00e2le<\/a><\/div>\n\n\n\n
M\u00e2les Immatures<\/a><\/div>\n\n\n\n
M\u00e2les<\/a><\/div>\n\n\n\n
Femelles immatures et matures<\/a><\/div>\n\n\n\n
Prise du m\u00e2le<\/a><\/div>\n\n\n\n
Accouplement<\/a><\/div>\n\n\n\n
Ponte<\/a><\/div>\n\n\n\n
Pr\u00e9dation<\/a><\/div>\n\n\n\n
Cannibalisme<\/a><\/div>\n\n\n\n
Curiosit\u00e9s<\/a><\/div>\n\n\n\n
Galerie<\/a><\/div>\n\n\n\n
Le repas<\/a><\/div>\n\n\n\n
Aide \u00e0 l’identification<\/a><\/div>\n<\/div>\n\n\n\n
<\/div>\n\n\n\n

Ouvrages consult\u00e9s :
\u2013 Daniel Grand et Jean-Pierre Boudot, Les Libellules de France, Belgique et Luxembourg, collection Parth\u00e9nope, 2006
\u2013 Guide des Libellules de France et d\u2019Europe, K. -D.B. Dijkstra & R. Lewington, Delachaux et Niestl\u00e9, 2007
\u2013 Paul Andr\u00e9 Robert, Les Libellules, Delachaux et Niestl\u00e9, 1958
\u2013 Atlas of the European dragonflies and damselfies<\/a>, Jean-Pierre Boudot & Vincent J. Kalkman, KNNV Publishing, 2015
\u2013 Europe\u2019s Dragonflies, A Field Guide to damselflies and dragonflies, Dave Smallshire & Andy Swash, British Dragonfly Society, 2020
\u2013 R. R. Askew, 2004 \u2013 The Dragonflies of Europa \u2013 Harley Books
– Cahier d\u2019identification des Libellules de France, Belgique, Luxembourg & Suisse, Daniel Grand, Jean-Pierre Boudot & Guillaume Doucet, Biotope, 2014
– Libellules d\u2019Europe \u2013 Europe centrale et m\u00e9ridionale \u2013 G. Jurzitza \u2013 Delachaux et Niestl\u00e9 – 1993
– J. d\u2019Aguilar, J-L Dommanget, R. Prechac \u2013 Guide des Libellules d\u2019Europe et d\u2019Afrique du Nord \u2013 Delachaux & Niestl\u00e9, 1985<\/p>\n","protected":false},"excerpt":{"rendered":"

Identification – Description Ischnura elegans est vraiment tr\u00e8s commun en France, sans doute la plus commune de nos libellules. C’est un petit zygopt\u00e8re, un Coenagrionidae d’environ 32 mm.Il montre de petites taches postoculaires rondes et des pt\u00e9rostigmas en diamants, bicolores, ces deux \u00e9l\u00e9ments \u00e9tant caract\u00e9ristiques du genre, le bord post\u00e9rieur de son pronotum est fortement […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","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":""},"class_list":["post-12719","page","type-page","status-publish","hentry"],"yoast_head":"\nIschnura elegans - 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