{"id":18412,"date":"2024-02-22T19:09:51","date_gmt":"2024-02-22T18:09:51","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=18412"},"modified":"2026-01-09T08:41:15","modified_gmt":"2026-01-09T07:41:15","slug":"uracis-infumata","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2024\/02\/22\/uracis-infumata\/","title":{"rendered":"P\u00e9rou- Uracis infumata (Rambur, 1842)"},"content":{"rendered":"\n
\"Uracis<\/a>
Uracis infumata m\u00e2le, P\u00e9rou, ARC (Chino), 17\/08\/2023<\/figcaption><\/figure>\n\n\n\n

Rambur a cr\u00e9\u00e9 le genre Uracis mais a d\u00e9crit Uracis infumata sous le nom de Libellula infumata dans son \u00ab\u00a0Histoire Naturelle des Insectes N\u00e9vropt\u00e8res\u00a0\u00bb en 1842. Il ne donne pas sa taille (il manquait une partie de l’abdomen), et pas de d\u00e9tail sur son mode de vie, seulement sa \u00ab\u00a0patrie\u00a0\u00bb d’origine, le Br\u00e9sil.
Dans Calvert, \u00ab\u00a0Contribution to a Knowledge of the Odonata of the Neotropical Region Exclusive of Mexico and Central America<\/em>\u00a0\u00bb qui fournit une premi\u00e8re cl\u00e9 des Uracis, on lit que son abdomen mesure 25 mm, soit qu’il atteint une longueur totale d’environ 36 mm.<\/p>\n\n\n\n

\"Uracis<\/a>
Uracis infumata m\u00e2le, P\u00e9rou, ARC (Chino), 19\/08\/2023<\/figcaption><\/figure>\n\n\n\n

Nous les avons rencontr\u00e9s dans une zone mar\u00e9cageuse, en for\u00eat, \u00e0 peu de distance d’un petit ruisseau sur lequel se trouvait un autre infumata<\/em>, mais cette fois Argia infumata. Ils se reproduisent en principe dans les mares temporaires.<\/p>\n\n\n\n

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

L’identification pourrait para\u00eetre simple avec ces ailes si largement tach\u00e9es. <\/p>\n\n\n\n

\"Variation<\/a><\/figure>
\n

En fait, l’\u00e9tendue de la coloration alaire est tr\u00e8s variable, parfois totalement absente, parfois s’\u00e9tendant d’avant le nodus jusqu’au pt\u00e9rostigma, parfois jusqu’\u00e0 l’apex. Certaines de ces variations peuvent ressembler \u00e0 celles \u00e0 d’autres Uracis, particuli\u00e8rement \u00e0 Uracis siemensi, aussi pr\u00e9sent.

Uracis infumata m\u00e2le, variation des ailes, Costa & Santos (1)
<\/p>\n<\/div><\/div>\n\n\n\n

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

S’il y a un doute, il faut compter les nervures transverses dans l’espace cubital de l’aile ant\u00e9rieure ; 5 \u00e0 7 pour Uracis infumata, 2 \u00e0 4 pour U. siemensi (1).

Ci-contre, le d\u00e9tail d’une aile de Uracis infumata et ses 6 \u00ab\u00a0crossveins<\/em>\u00ab\u00a0.<\/p>\n<\/div>

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

Pour m\u2019y retrouver dans les cl\u00e9s propos\u00e9es, j\u2019ai r\u00e9alis\u00e9 cette petite synth\u00e8se (il y manque U. turrialba, mais il n’est pr\u00e9sent qu’au Costa Rica) :<\/p>\n\n\n\n

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

Leurs appendices anaux sont blancs et ils portent des motifs clairs sur l’abdomen ; malheureusement, ceux de U. siemensi sont \u00e0 peu pr\u00e8s identiques.
Remarquer l’extension de la coloration alaire jusqu’\u00e0 l’apex pour le sujet de gauche. Noter aussi le petit point rouge, juste au-dessus de la patte ant\u00e9rieure droite : c’est certainement un parasite, un hydracarien.<\/p>\n\n\n\n

\"Uracis<\/a><\/figure>
\n
\"P\u00e9rou,<\/a><\/figure>\n\n\n\n

Uracis infumata m\u00e2le, P\u00e9rou, ARC (Chino), 17 et 19\/08\/2023<\/p>\n<\/div><\/div>\n\n\n\n

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

Les m\u00e2les immatures ou jeunes, les femelles portent des motifs thoraciques tout \u00e0 fait particuliers qui leur sont uniques sous forme de br\u00e8ves lignes parall\u00e8les claires produisant presque un effet de \u00ab\u00a0grain de bois\u00a0\u00bb (2).<\/p>\n\n\n\n

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

On rencontre l’esp\u00e8ce sur tout le bassin de l’Amazone, y compris en Guyane fran\u00e7aise, m\u00eame si cela ne figure pas dans le document ci-dessous.
IUCN Red List<\/a>

Apr\u00e8s h\u00e9sitation, je ne propose finalement que cette seule photo de femelle ci-dessous, la seule dont le motif alaire assure son appartenance \u00e0 l’esp\u00e8ce. Apr\u00e8s examen minutieux de la nervation de toutes les femelles aux ailes hyalines, je les ai toutes class\u00e9es avec les femelles U. siemensi.
Et c’est bien dommage, car ces femelles Uracis sont int\u00e9ressantes ; elles pr\u00e9sentent 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 (2).<\/p>\n\n\n\n

\"Uracis<\/a>
Uracis infumata femelle, P\u00e9rou, ARC (Chino), 17\/08\/23<\/figcaption><\/figure>\n\n\n\n

Etymologie<\/strong>
Uracis<\/strong> du grec oura<\/em> pour queue<\/em> et de akis<\/em> signifiant aiguille<\/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 (3) la d\u00e9crit lorsqu’il cr\u00e9e le genre et tr\u00e8s en d\u00e9tail pour la premi\u00e8re esp\u00e8ce qu’il place dans le genre, nomm\u00e9e U. quadra<\/em> (futur U. imbuta). Voici ce qu’il \u00e9crit \u00e0 propos de ce nouveau genre\u00a0: \u00ab\u00a0bord vulvaire prolong\u00e9 en une longue pointe canalicul\u00e9e d\u00e9passant l’anus, accompagn\u00e9 d’un prolongement semblable du segment suivant, qui pr\u00e9sente une petite car\u00e8ne pour s’engrener dedans.\u00a0\u00bb
Pour expliciter je montre ici les derniers segments de la femelle Uracis fastigiata<\/a>.
Infumata<\/strong>,du latin infumare<\/em>, –s\u00e9cher \u00e0 la fum\u00e9e ou enfumer<\/em>, en rapport bien s\u00fbr avec la coloration fum\u00e9e des ailes.<\/p>\n\n\n\n

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

1- Costa & Santos, 1997 – Intra-and interspecific variation in the genus Uracis Rambur, 1842, with a key to the known species (Anisoptera: Libellulidae)<\/a> – Odonatologica 26(1) : -1-7, March 1, 1997
2- Dragonflies and Damselflies of Costa Rica, Dennis Paulson & William Haber, 2021
3- Rambur, Jules, 1842\u00a0\u2013\u00a0Histoire naturelle des insectes. N\u00e9vropt\u00e8res<\/a><\/em>\u00a0\u2013 Librairie Encyclop\u00e9dique de Roret. P. 74.<\/p>\n\n\n\n

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

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

Rambur a cr\u00e9\u00e9 le genre Uracis mais a d\u00e9crit Uracis infumata sous le nom de Libellula infumata dans son \u00ab\u00a0Histoire Naturelle des Insectes N\u00e9vropt\u00e8res\u00a0\u00bb en 1842. Il ne donne pas sa taille (il manquait une partie de l’abdomen), et pas de d\u00e9tail sur son mode de vie, seulement sa \u00ab\u00a0patrie\u00a0\u00bb d’origine, le Br\u00e9sil.Dans Calvert, \u00ab\u00a0Contribution […]<\/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-18412","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 infumata - 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