{"id":3278,"date":"2019-07-08T16:43:03","date_gmt":"2019-07-08T14:43:03","guid":{"rendered":"http:\/\/www.meslibellules.fr\/blog\/?p=3278"},"modified":"2023-07-28T19:32:35","modified_gmt":"2023-07-28T17:32:35","slug":"differencier-lestes-sponsa-et-lestes-dryas","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2019\/07\/08\/differencier-lestes-sponsa-et-lestes-dryas\/","title":{"rendered":"Diff\u00e9rencier Lestes sponsa et Lestes dryas"},"content":{"rendered":"\n

L’identification doit s\u00e9parer L. dryas de L. sponsa, son plus proche cousin.
Le crit\u00e8re absolu pour diff\u00e9rencier Lestes sponsa et Lestes dryas m\u00e2les, quelque soit l’\u00e2ge de l’individu, reste la forme des appendices anaux<\/u> qui sont assez courts, spatul\u00e9s \u00e0 leur extr\u00e9mit\u00e9 et recourb\u00e9s vers l’int\u00e9rieur pour L. dryas. Ceux de L. sponsa sont plus longs et droits.<\/p>\n\n\n\n

\"Comparaison<\/a>
Comparaison des appendices anaux de Lestes sponsa et Lestes dryas<\/figcaption><\/figure>\n\n\n\n

Pour les m\u00e2les adultes et pruineux, la pruinosit\u00e9 de Lestes dryas doit respecter le dernier<\/span> <\/span><\/em>tiers du 2\u00b0 segment abdominal<\/span>. Mais attention c’est parfois le cas pour L. sponsa. Dans ce cas les limites de la pruinosit\u00e9 sont moins nettes, comme floues.<\/p>\n\n\n\n

\n
\"L.
L. sponsa, 2\u00b0 segment abdominal<\/figcaption><\/figure>\n\n\n\n
\"L.
L. dryas, 2\u00b0 segment abdominal<\/figcaption><\/figure>\n<\/figure>\n\n\n\n

Pour les Lestes dryas \u00e9mergents, jeunes et non encore pruineux, le lobe lat\u00e9ral du pronotum<\/span> est recouvert de coloration m\u00e9tallique, ce qui n’est pas le cas de L. sponsa. Ceci pour les m\u00e2les et les femelles.

La forme de la tache<\/span> port\u00e9e par l’infra \u00e9pisterne m\u00e9sothoracique, c’est \u00e0 dire la zone situ\u00e9e juste au dessus de la coxa (la hanche) de la patte moyenne; si elle est bien individualis\u00e9e elle indique Lestes sponsa (\u2642 & \u2640). Si elle est confondue avec le reste de la coloration c’est sans doute Lestes dryas, mais attention certains Lestes sponsa sont limites sur ce d\u00e9tail, d’autant plus qu’ils sont \u00e2g\u00e9s. <\/p>\n\n\n\n

\"Comparaison<\/a>
Comparaison lobe pronotum et tache color\u00e9e L. sponsa \/ L. dryas<\/figcaption><\/figure>\n\n\n\n

D’autres crit\u00e8res sont difficiles \u00e0 appr\u00e9cier sur le terrain, sans comparaison ou sans capture, notamment la couleur des yeux des m\u00e2les matures, bien difficile \u00e0 d\u00e9crire, unique pour L. dryas. Un bleu profond qu’il est sans doute le seul de nos odonates europ\u00e9ens \u00e0 pr\u00e9senter.<\/p>\n\n\n\n

\"Lestes
Lestes dryas et ses yeux bleu c\u00e9ramique.<\/figcaption><\/figure>\n\n\n\n

Difficile \u00e9galement \u00e0 appr\u00e9cier sur photo sans capture est la forme de la coloration m\u00e9tallique sur le 1\u00b0 segment abdominal qui prend la forme de 2 rectangles juxtapos\u00e9s pour L. dryas alors que l’on d\u00e9crit 2 triangles pour L. sponsa (\u2642 & \u2640). <\/p>\n\n\n\n

\"Comparaison
Comparaison premier segment abdominal L. dryas vs L. sponsa<\/figcaption><\/figure>\n\n\n\n

Il faut une bonne habitude pour appr\u00e9cier la forme et la couleur des pt\u00e9rostigmas de ces Lestes sur le terrain ; ceux de L. dryas sont plus sombres (un peu…), plus \u00e9pais et plus courts que ceux de L. sponsa, ou en tout cas paraissent plus courts, car ils sont nettement (en tout cas beaucoup plus nettement que ceux de L. sponsa) bord\u00e9s de zones claires de chaque c\u00f4t\u00e9 pour les individus matures, mais ces zones claires s’estompent avec le vieillissement. Je n’ai pas de photo de L. sponsa avec des zones claires marqu\u00e9es aux 4 pt\u00e9rostigmas, la plupart n’en ont pas.
On peut conclure qu’un Lestes pour lequel on h\u00e9site entre ces 2 esp\u00e8ces et qui n’a pas de zone claire entourant les pt\u00e9rostigmas est tr\u00e8s certainement un Lestes sponsa…<\/p>\n\n\n\n

On note souvent pour les lestes dryas m\u00e2les ou femelles la pr\u00e9sence d’une pointe thoracique color\u00e9e, presque \u00e0 la fa\u00e7on de Chalcolestes viridis, ce qui est extr\u00eamement rare pour L. sponsa (en tout cas je ne l’ai jamais vu).<\/p>\n\n\n\n

\"Lestes<\/a>
Lestes dryas m\u00e2le immature, France, r\u00e9serve du Pinail (85), 02\/06\/2013<\/figcaption><\/figure>\n\n\n\n

Il est facile de diff\u00e9rencier L. dryas de L. sponsa pour les sujets \u00e9mergents gr\u00e2ce \u00e0 un d\u00e9tail inattendu; les L. sponsa \u00e9mergents, m\u00e2les ou femelles, montre une coloration orang\u00e9e, presque fa\u00e7on soleil couchant(!), vraiment spectaculaire, sur les parties claires du thorax et de l’abdomen, d’ailleurs tout \u00e0 fait en accord avec leurs yeux \u00e0 ce stade.<\/p>\n\n\n\n

\"Lestes<\/a>
Lestes sponsa \u00e9mergent, France, Chanteloup les bois, 22\/05\/2011<\/figcaption><\/figure>\n\n\n\n

On lit que pour diff\u00e9rencier Lestes sponsa et Lestes dryas femelles, il faut examiner l’ovipositeur, celui de L. dryas d\u00e9passant le 10\u00b0 segment abdominal; malheureusement c’est extr\u00eamement rare <\/em>et je n’ai qu’une photo ou l’on peut difficilement le constater. Mais il est certain que l’ovipositeur de L. dryas est en moyenne plus long que celui de L. sponsa.
Ci-dessous une femelle dont l\u2019ovipositeur d\u00e9passe S10:<\/p>\n\n\n\n

\"Lestes
Lestes dryas femelle, ovipositeur, lac de Bourdouze (63), 22\/07\/2017<\/figcaption><\/figure>\n\n\n\n

Malheureusement on en trouve comme celle-ci o\u00f9 l\u2019ovipositeur ne r\u00e9pond pas \u00e0 la norme… :
<\/p>\n\n\n\n

\"Lestes
Lestes dryas femelle, ovipositeur, r\u00e9serve du Pinail, (86), 02\/06\/2013<\/figcaption><\/figure>\n\n\n\n

Il faut donc retenir que lorsque l’ovipositeur d\u00e9passe le S10 c’est L. dryas, mais s’il est plus court ce n’est pas forc\u00e9ment L. sponsa…
Quand \u00e0 l’\u00e9caille vulvaire qu’on voit ici tr\u00e8s bien, triangulaire \u00e0 pointe distale, qui prend naissance sur l’ovipositeur \u00e0 la jonction du 8\u00b0 et du 9\u00b0 segment et qu’on dit diff\u00e9rente entre les femelles L. sponsa et L. dryas, je n’ai jamais r\u00e9ussi \u00e0 lui trouver une forme suffisamment constante au sein d’une m\u00eame esp\u00e8ce pour en tirer une quelconque indication pour affirmer une identification…

Enfin, il peut \u00eatre utile de v\u00e9rifier l’aspect de la suture hum\u00e9rale ; elle est g\u00e9n\u00e9ralement tr\u00e8s discr\u00e8te pour L. dryas, plus large et nettement soulign\u00e9e d’une coloration claire pour L. sponsa, comme on le constate facilement ci-dessous.<\/p>\n\n\n\n

\"Lestes<\/a>
Lestes sponsa et dryas femelles, comparaison de la suture hum\u00e9rale<\/figcaption><\/figure>\n\n\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n
\"\"<\/a><\/figure>\n","protected":false},"excerpt":{"rendered":"

L’identification doit s\u00e9parer L. dryas de L. sponsa, son plus proche cousin. Le crit\u00e8re absolu pour diff\u00e9rencier Lestes sponsa et Lestes dryas m\u00e2les, quelque soit l’\u00e2ge de l’individu, reste la forme des appendices anaux qui sont assez courts, spatul\u00e9s \u00e0 leur extr\u00e9mit\u00e9 et recourb\u00e9s vers l’int\u00e9rieur pour L. dryas. Ceux de L. sponsa sont plus […]<\/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":"default","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":[55,115,116,90],"tags":[],"class_list":["post-3278","post","type-post","status-publish","format-image","hentry","category-france","category-lestes-dryas","category-lestes-sponsa","category-lestidae-france","post_format-post-format-image"],"yoast_head":"\nDiff\u00e9rencier Lestes sponsa et Lestes dryas - 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