{"id":18469,"date":"2024-03-01T08:42:51","date_gmt":"2024-03-01T07:42:51","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=18469"},"modified":"2026-01-09T08:20:52","modified_gmt":"2026-01-09T07:20:52","slug":"uracis-siemensi","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2024\/03\/01\/uracis-siemensi\/","title":{"rendered":"P\u00e9rou – Uracis siemensi (Kirby, 1897)"},"content":{"rendered":"\n
\n
\"Uracis<\/a><\/figure>\n\n\n\n
\"Uracis<\/a><\/figure>\n
Uracis siemensi m\u00e2le, P\u00e9rou, ARC (Chino), 17\/08\/2023<\/figcaption><\/figure>\n\n\n\n

Nous n’avons rencontr\u00e9 Uracis siemensi qu’avec des ailes hyalines ; il se pr\u00e9sente sous au moins 3 formes qu’ont repr\u00e9sent\u00e9es Costa et Santos (1997) dont je reproduis une illustration ci-dessous :<\/p>\n\n\n\n

\"Uracis<\/figure>
\n

Malheureusement, d’autres esp\u00e8ces d’Uracis peuvent avoir les ailes hyalines, notamment Uracis infumata, fastigiata ou m\u00eame imbuta<\/em>.

.<\/p>\n<\/div><\/div>\n\n\n\n

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

Il faut essentiellement se fier \u00e0 la nervation, telle qu’elle est d\u00e9taill\u00e9e dans le document d\u00e9j\u00e0 cit\u00e9 ; le triangle de l’aile post\u00e9rieure est libre (pas de veine transverse), 3 \u00e0 4 cellules dans le subtriangle de l’aile ant\u00e9rieure, le champ disco\u00efdal de l’aile post\u00e9rieure avec une rang\u00e9e de cellules, deux rang\u00e9es de cellules dans le champ anal, selon la cl\u00e9 de Costa et Santos.<\/p>\n<\/div>

\"Champs<\/a><\/figure><\/div>\n\n\n\n
<\/div>\n\n\n\n

Pour m’y retrouver dans les cl\u00e9s propos\u00e9es, j’ai r\u00e9alis\u00e9 cette petite synth\u00e8se :<\/p>\n\n\n\n

\"R\u00e9capitulatif<\/figure>\n\n\n\n

Nous les avons rencontr\u00e9s dans des flaques de lumi\u00e8re, en for\u00eat mar\u00e9cageuse, une zone totalement inond\u00e9e une partie de l’ann\u00e9e par l’Amazone et ses tributaires.<\/p>\n\n\n\n

\n
\"Uracis<\/a><\/figure>\n\n\n\n
\"Uracis<\/a><\/figure>\n
Uracis siemensi m\u00e2le, P\u00e9rou, ARC (Chino), 20\/08\/2023<\/figcaption><\/figure>\n\n\n\n

Ils se reproduisent sur des eaux stagnantes comme en t\u00e9moigne la pr\u00e9sence d’un hydracarien (petit point rouge sur la photo de droite ci-dessous), ceux-ci ne parasitant les odonates que presque exclusivement dans les milieux lentiques<\/a>.<\/p>\n\n\n\n

\n
\"U.<\/a><\/figure>\n\n\n\n
\"Uracis<\/a><\/figure>\n
Uracis siemensi m\u00e2le, P\u00e9rou, ARC (Chino), 17 & 19\/08\/2023<\/figcaption><\/figure>\n\n\n\n

Mais le plus souvent sur des mares fortement ombrag\u00e9es\u2026 comme le montrent les photos ci-dessous.

On le rencontre sans doute sur tout le bassin amazonien, soit Br\u00e9sil, Guyane Fran\u00e7aise, Suriname, Venezuela, Colombie, \u00c9quateur, P\u00e9rou et Bolivie.
IUCN Red List<\/a><\/p>\n\n\n\n

\n
\"Uracis<\/a><\/figure>\n\n\n\n
\"M\u00e2le,<\/a><\/figure>\n
Uracis siemensi m\u00e2le, P\u00e9rou, ARC (Chino), 17\/08\/2023<\/figcaption><\/figure>\n\n\n\n

Ci-dessous, un jeune m\u00e2le, qui montre le tr\u00e8s curieux motif thoracique qui orne son thorax ; ce pattern, en \u00ab\u00a0grain de bois \u00a0\u00bb est sp\u00e9cifique des Uracis.<\/p>\n\n\n\n

\"Uracis<\/a>
Uracis siemensi m\u00e2le, P\u00e9rou, ARC (Chino), 17\/08\/2023<\/figcaption><\/figure>\n\n\n\n

Les femelles montrent un spectaculaire appendice, une plaque sous-g\u00e9nitale appel\u00e9e pseudo-ovipositeur qui leur permet, en sautant verticalement \u00e0 la fa\u00e7on de nos femelles Cordulegaster, de planter leurs \u0153ufs dans la boue des mares ou la berge des ruisseaux. La veination identique \u00e0 celle des m\u00e2les, la longueur de ce pseudo-ovipositeur et sa partie apicale tronqu\u00e9e confirment l’identification.<\/p>\n\n\n\n

\n
\"Uracis<\/a><\/figure>\n\n\n\n
\"Peru,<\/a><\/figure>\n
Uracis siemensi femelle, P\u00e9rou, ARC (Chino), 17\/08\/2023<\/figcaption><\/figure>\n\n\n\n

\u00c9tymologie<\/strong>

Uracis<\/strong>\u00a0du grec\u00a0oura<\/em>\u00a0pour\u00a0queue<\/em>\u00a0et de\u00a0akis<\/em>\u00a0signifiant\u00a0aiguille<\/em>. Ceci en r\u00e9f\u00e9rence aux derniers segments \u00e9tir\u00e9s de la femelle et \u00e0 la plaque sous-g\u00e9nitale d\u00e9j\u00e0 cit\u00e9e. Rambur la d\u00e9crit lorsqu\u2019il cr\u00e9e le genre et tr\u00e8s en d\u00e9tail pour la premi\u00e8re esp\u00e8ce qu\u2019il place dans le genre, nomm\u00e9e U.\u00a0quadra<\/em>\u00a0(futur U. imbuta). Voici ce qu\u2019il \u00e9crit \u00e0 propos de ce nouveau genre\u00a0: \u00ab\u00a0bord vulvaire prolong\u00e9 en une longue pointe canalicul\u00e9e d\u00e9passant l\u2019anus, accompagn\u00e9 d\u2019un prolongement semblable du segment suivant, qui pr\u00e9sente une petite car\u00e8ne pour s\u2019engrener dedans.\u00a0\u00bb
Pour expliciter, je montre ici les derniers segments de la\u00a0femelle Uracis fastigiata<\/a>.

La recherche de l’origine de du nom d’esp\u00e8ce siemensi<\/strong> a \u00e9t\u00e9 assez amusante. Je suis parti du titre de la publication dans laquelle Kirby a d\u00e9crit l’esp\u00e8ce : \u00ab\u00a0List of the Neuroptera collected by Mr. E. E. Austen on the Amazons &c. during the recent expedition of Messrs. Siemens Bros. Cable S. S. ‘Faraday,’ with descriptions of several new species of Odonata (dragonflies).
J’ai finalement compris que Les Fr\u00e8res Siemens, \u00ab\u00a0Siemens Brother\u00a0\u00bb de la fameuse firme, ont affr\u00e9t\u00e9 un navire poseur de c\u00e2bles sous-marins, nomm\u00e9 \u00ab\u00a0Faraday\u00a0\u00bb et que l’une de ces aventureuses exp\u00e9ditions l’a amen\u00e9 \u00e0 poser un c\u00e2ble de communication dans l’Amazone. Sur ce bateau se trouvait E. E. Austen, entomologiste et dipt\u00e9riste qui a adress\u00e9 de nombreux sp\u00e9cimens d’odonates \u00e0 William Forsell Kirby.
Mr. E. E. Austen a re\u00e7u de Kirby de meilleurs hommages pour d’autres esp\u00e8ces collect\u00e9es sur d’autres continents comme Drepanosticta austeni, Othetrum austeni ou Ceylonosticta austeni.<\/p>\n\n\n\n

\n
\"Uracis<\/a><\/figure>\n\n\n\n
\"Uracis<\/a><\/figure>\n
Uracis siemensi femelle, P\u00e9rou, Tahuayo, 14\/08\/2023<\/figcaption><\/figure>\n\n\n\n

Sur ces 2 derni\u00e8res femelles, on retrouve les caract\u00e9ristiques alaires mentionn\u00e9es plus haut.<\/p>\n\n\n\n

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

Costa & Santos, 1997<\/strong> – Intra-and interspecific variation in the genus Uracis Rambur, 1842, with a key to the known species (Anisoptera: Libellulidae)<\/a>.\u00a0Odonatologica<\/em>,\u00a026<\/em>(1), 1\u20137.<\/p>\n\n\n\n

<\/div>\n\n\n\n
\n
Accueil P\u00e9rou<\/a><\/div>\n<\/div>\n\n\n\n

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

Nous n’avons rencontr\u00e9 Uracis siemensi qu’avec des ailes hyalines ; il se pr\u00e9sente sous au moins 3 formes qu’ont repr\u00e9sent\u00e9es Costa et Santos (1997) dont je reproduis une illustration ci-dessous : Malheureusement, d’autres esp\u00e8ces d’Uracis peuvent avoir les ailes hyalines, notamment Uracis infumata, fastigiata ou m\u00eame imbuta. . Il faut essentiellement se fier \u00e0 la […]<\/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":[1304,1303],"tags":[1306,1305],"class_list":["post-18469","post","type-post","status-publish","format-image","hentry","category-libellulidae-perou-2","category-perou","tag-libellulidae-perou","tag-perou","post_format-post-format-image"],"yoast_head":"\nUracis siemensi - 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