voir l’image l\u00e9gend\u00e9e<\/a><\/p>\n <\/p>\n
Le corps, dont la longueur varie de 12 \u00e0 30\u00a0mm, a une forme effil\u00e9e et est de couleur brune \u00e0 jaune.<\/p>\n
\u00c0 l’avant, la t\u00eate porte une paire de courtes antennes et deux yeux compos\u00e9s tr\u00e8s volumineux.
\nLa bouche ventrale est associ\u00e9e \u00e0 des pi\u00e8ces buccales atrophi\u00e9es et souples, l’imago ne s’alimentant pas.<\/p>\n
En arri\u00e8re de la t\u00eate, le thorax est form\u00e9 de trois segments (prothorax, m\u00e9sothorax et m\u00e9tathorax), le deuxi\u00e8me \u00e9tant particuli\u00e8rement d\u00e9velopp\u00e9 \u00e0 la diff\u00e9rence des deux autres.
\nIl poss\u00e8de deux paires d’ailes dorsales fines et transparentes, les ailes post\u00e9rieures \u00e9tant plus r\u00e9duites que les ailes ant\u00e9rieures. Au repos, elles sont maintenues dress\u00e9es au-dessus du corps.
\nEn position ventrale, il pr\u00e9sente trois paires de pattes d\u00e9licates mais chez le m\u00e2le, la premi\u00e8re est allong\u00e9e et impliqu\u00e9e dans l’accouplement.<\/p>\n
L’abdomen post\u00e9rieur est pour sa part caract\u00e9ris\u00e9 par l’existence de trois expansions filamenteuses (cerques et filet m\u00e9dian).<\/p>\n
<\/p>\n
Cycle de vie<\/h2>\n
La dur\u00e9e de vie de l’adulte varie de un jour \u00e0 une semaine, alors que la p\u00e9riode de d\u00e9veloppement dure un \u00e0 deux ans.<\/p>\n
Dans les heures qui suivent l’accouplement, la femelle d\u00e9pose ses \u0153ufs dans une pi\u00e8ce d’eau.<\/p>\n
Au terme du d\u00e9veloppement embryonnaire, ils lib\u00e8rent des individus dont la morphologie et l’anatomie, ainsi que le mode et le milieu de vie sont diff\u00e9rents de ceux de l’adulte. Il s’agit de larves.
\nAquatiques, elles sont fouisseuses, nageuses ou mobiles sur le fond.<\/p>\n
Elles connaissent un d\u00e9veloppement post-embryonnaire comprenant plusieurs stades s\u00e9par\u00e9s par des mues, dont le nombre peut exc\u00e9der vingt-cinq.
\nElles s’alimentent activement, d’algues ou de diverses proies selon les esp\u00e8ces.<\/p>\n
Le d\u00e9veloppement post-embryonnaire prend fin avec l’\u00e9mergence de l’imago qui survient \u00e0 la faveur d’une mue apr\u00e8s que la larve de dernier stade d\u00e9sign\u00e9e comme sub-imago, soit sortie de l’eau et ait cess\u00e9 de se nourrir.<\/p>\n
En relation avec les particularit\u00e9s de leur cycle de vie et notamment la pr\u00e9sence d’une larve mais pas d’une v\u00e9ritable m\u00e9tamorphose, les \u00c9ph\u00e9m\u00e9ropt\u00e8res sont qualifi\u00e9s d’Insectes h\u00e9t\u00e9rom\u00e9taboles h\u00e9mim\u00e9taboles.<\/p>\n
<\/p>\n
\n","protected":false},"excerpt":{"rendered":" \u00c9tymologiquement, le terme \u00ab\u00a0\u00c9ph\u00e9m\u00e9ropt\u00e8re\u00a0\u00bb d\u00e9rive de \u00ab\u00a0ephemeros\u00a0\u00bb signifiant \u00ab\u00a0vit un jour\u00a0\u00bb et \u00ab\u00a0pteron\u00a0\u00bb signifiant \u00ab\u00a0aile\u00a0\u00bb. Il est une r\u00e9f\u00e9rence \u00e0 la dur\u00e9e de vie des imagos. Le taxon des \u00c9ph\u00e9m\u00e9ropt\u00e8res compte environ 2\u00a0000 esp\u00e8ces. Ses repr\u00e9sentants sont g\u00e9n\u00e9ralement rencontr\u00e9s en \u00e9t\u00e9 et \u00e0 proximit\u00e9 des \u00e9tendues d’eau. Caract\u00e9ristiques morphologiques L’\u00c9ph\u00e9m\u00e8re, souvent d\u00e9sign\u00e9e […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":5386,"menu_order":2,"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":"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":""},"class_list":["post-5169","page","type-page","status-publish","hentry"],"aioseo_notices":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/pages\/5169","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/comments?post=5169"}],"version-history":[{"count":4,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/pages\/5169\/revisions"}],"predecessor-version":[{"id":5173,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/pages\/5169\/revisions\/5173"}],"up":[{"embeddable":true,"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/pages\/5386"}],"wp:attachment":[{"href":"https:\/\/codexvirtualis.fr\/codex\/wp-json\/wp\/v2\/media?parent=5169"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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<\/a>