{"id":5222,"date":"2020-03-22T17:25:01","date_gmt":"2020-03-22T16:25:01","guid":{"rendered":"http:\/\/www.meslibellules.fr\/blog\/?p=5222"},"modified":"2025-06-25T23:32:09","modified_gmt":"2025-06-25T21:32:09","slug":"orthetrum-chrysostigma","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2020\/03\/22\/orthetrum-chrysostigma\/","title":{"rendered":"Namibie – Orthetrum chrysostigma (Burmeister, 1839)"},"content":{"rendered":"\n
\"Orthetrum<\/a>
Orthetrum chrysostigma m\u00e2le, Namibie, Shitemo sur l’Omatako River (Rundu), 21\/02\/2020<\/figcaption><\/figure>\n\n\n\n

C’est une esp\u00e8ce commune en Namibie et je n’avais jusqu’alors rencontr\u00e9 que des femelles, en Afrique du Sud<\/a>, tr\u00e8s jeune, puis en Ethiopie<\/a>, bien \u00e2g\u00e9e. Mais m\u00eame sur ces femelles, on met bien en \u00e9vidence la principale caract\u00e9ristique qui permet son identification, cette bande claire thoracique qu’on ne voit ici qu’en cliquant sur la photo. Et encore, ce n’est pas tr\u00e8s \u00e9vident et c’est tout le probl\u00e8me des Orthetrum africains\u202f! Cette bande claire lui donne son nom anglais, Epaulet skimmer<\/em>.
Ci-dessous c’est plus facile et sur ces 2 sujets, on peut remarquer d’autres d\u00e9tails, comme la nervure costale des 4 ailes (la veine la plus ant\u00e9rieure de l’aile) compl\u00e8tement claire et (et malheureusement partag\u00e9 avec O. brachiale et stemmale au moins) les nervures transverses (Ax) ant\u00e9nodales tr\u00e8s claires, surtout sous la nervure sous-costale.<\/p>\n\n\n\n

\"Orthetrum<\/a>
Orthetrum chrysostigma m\u00e2le, Namibie, fuite du barrage Van Bach, 08\/02\/2020 <\/figcaption><\/figure>\n\n\n\n

Les pt\u00e9rostigmas sont clairs, la nervation est tr\u00e8s variable et on compte entre 0 et 15 cellules d\u00e9doubl\u00e9es au-dessus de la veine Radiale suppl\u00e9mentaire (Rspl). La face est claire, plus jaun\u00e2tre que blanche avec le front pruineux pour les m\u00e2les matures.
L’abdomen est long et fin au-del\u00e0 de la dilatation du 2\u00b0 et 3\u00b0 segment, et semble triangulaire \u00e0 la coupe. Il mesure entre 39 et 45 mm.
Ci-dessous les 2 photos le 21\/02\/2020, en Namibie bien s\u00fbr, pr\u00e8s de Rundu et m\u00eame plus pr\u00e9cis\u00e9ment de Shitemo, sur un petit affluent de l’Okavango, l’Omatako river<\/a>.<\/p>\n\n\n\n

\n
\"Orthetrum<\/a><\/figure>\n\n\n\n
\"Epaulet<\/a><\/figure>\n
Orthetrum chrysostigma m\u00e2le, Namibie, Shitemo sur l’Omatako River (Rundu), 21\/02\/2020<\/figcaption><\/figure>\n\n\n\n

Les m\u00e2les en maturation sont \u00e9tonnants et magnifiques lorsque la pruinosit\u00e9 bleue envahi progressivement l’abdomen et laisse transpara\u00eetre des zones claires:<\/p>\n\n\n\n

\n
\"Orthetrum<\/a><\/figure>\n\n\n\n
\"Epaulet<\/a><\/figure>\n
Orthetrum chrysostigma m\u00e2le en maturation, Namibie, Shitemo<\/a>, Est de Rundu, 12\/02\/2020<\/figcaption><\/figure>\n\n\n\n

Je n’ai pas vu de femelle Orthetrum chrysostigma pos\u00e9e ; la seule que j’ai eue la chance de voir \u00e9tait en ponte, gard\u00e9e par son<\/em> m\u00e2le sur une grande mare<\/a> pr\u00e8s de Rundu. Et sur les femelles, la bande thoracique claire est tr\u00e8s \u00e9vidente, m\u00eame en vol. D’ailleurs, c’est curieusement un genre ou les femelles sont plus faciles \u00e0 identifier que les m\u00e2les, car les crit\u00e8res d’identification concernant la coloration, les motifs thoraciques ou abdominaux, ne sont pas, en principe, cach\u00e9s par la pruinosit\u00e9.<\/p>\n\n\n\n

\"\"<\/a>
Ortehtrum chrysostigma femelle en ponte, Namibie, Rundu, 12\/02\/20<\/figcaption><\/figure>\n\n\n\n

Ci-dessous cette m\u00eame femelle en ponte dans un fouillis d’herbes, surveill\u00e9e par son<\/em> m\u00e2le qui s’assure ainsi que les \u0153ufs largu\u00e9s \u00e0 chaque coup d’abdomen dans l’eau, ont bien \u00e9t\u00e9 f\u00e9cond\u00e9s par sa propre semence et qu’un autre m\u00e2le ne vienne pas, au moins pour quelques minutes, s’emparer de la femelle pour s’accoupler.<\/p>\n\n\n\n

\n
\"Epaulet<\/a><\/figure>\n\n\n\n
\"Orthetrum<\/a><\/figure>\n
Orthetrum chrysostigma femelle en ponte, Rundu, 12\/02\/20 – O. chrysostigma m\u00e2le, Rundu, 12\/02\/20<\/figcaption><\/figure>\n\n\n\n

D’ailleurs la photo suivante de ce m\u00eame m\u00e2le en vol permet de comprendre la difficult\u00e9 \u00e0 identifier tous ces odonates bleus et pruineux, car parfois et m\u00eame pour cette esp\u00e8ce, la pruinosit\u00e9 recouvre compl\u00e8tement le thorax et efface cette bande claire si utile; dans ce cas, il n’y a plus que l’examen de l’appareil g\u00e9nital secondaire sous le 2\u00b0 segment abdominal pour se tirer d’affaire<\/p>\n\n\n\n

\"Orthetrum<\/a>
Orthetrum chrysostigma m\u00e2le, Namibie, Rundu, 12\/02\/20<\/figcaption><\/figure>\n\n\n\n

J’ai observ\u00e9 de nombreux accouplements et en particulier sur une mare le 21 f\u00e9vrier, une v\u00e9ritable fr\u00e9n\u00e9sie de reproduction, ce qui m’a permis de faire des clich\u00e9s rapproch\u00e9s, quand les partenaires se montraient patients.<\/p>\n\n\n\n

\"Epaulet<\/a>
Orthetrum chrysostigma accouplement, Namibie, Rundu; 12\/02\/2020<\/figcaption><\/figure>\n\n\n\n
\"Orthetrum<\/a>
Orthetrum chrysostigma accouplement, Namibie, Shitemo sur Omatako river, 21\/02\/2020<\/figcaption><\/figure>\n\n\n\n

On rencontre Orthetrum chrysostigma sur les berges v\u00e9g\u00e9talis\u00e9es de mares et \u00e9tangs, en milieu ouvert et sur les parties calmes des rivi\u00e8res.
Il est commun en Afrique, du Cap \u00e0 la M\u00e9diterran\u00e9e, jusqu’au Moyen-Orient \u00e0 l’est et l’Espagne \u00e0 l’ouest.
IUCN Red List<\/a><\/p>\n\n\n\n

\n
\"Orthetrum<\/a><\/figure>\n\n\n\n
\"Orthetrum<\/a><\/figure>\n
Orthetrum chrysostigma accouplement, Namibie, Shitemo sur Omatako river, 21\/02\/2020<\/em> <\/figcaption><\/figure>\n\n\n\n

J’ai eu la surprise de photographier un couple dans lequel le m\u00e2le semble immature, au moins selon nos standards habituels qui veulent que la maturit\u00e9 sexuelle ne soit atteinte que lorsque les couleurs adultes sont bien \u00e9tablies; si c’est tr\u00e8s souvent le cas, il y a aussi de nombreux exemples ou on a pu observer des m\u00e2les pseudo-immatures en accouplement ce qui prouve bien qu’ils ne sont pas si immatures\u202f!
D’ailleurs, on aper\u00e7oit que sa coloration est en train d’\u00e9voluer puisque les derniers segments abdominaux sont d\u00e9j\u00e0 bleus. Enfin \u00e0 droite une photo de ce couple en tandem<\/em> ce qui est certainement peu souvent observ\u00e9, en tout cas, je n’avais jamais vu d’Orthetrum dans cette attitude.<\/p>\n\n\n\n

\n
\"Orthetrum<\/a><\/figure>\n\n\n\n
\"Orthetrum<\/a><\/figure>\n
Orthetrum chrysostigma accouplement, Namibie, Shitemo sur Omatako river, 21\/02\/2020<\/em> <\/figcaption><\/figure>\n\n\n\n

\u00c9tymologie<\/strong>
Orthetrum<\/strong>\u00a0vient de 2 mots grecs,\u00a0orthos<\/em>\u00a0signifiant \u00ab\u00a0droit<\/em>\u00a0\u00ab\u00a0et\u00a0etron<\/em>\u00a0\u00a0\u00ab\u00a0abdomen<\/em>\u00a0\u00a0\u00bb, ceci pour signifier que les c\u00f4t\u00e9s de l\u2019abdomen sont parall\u00e8les. Ce nom de genre cr\u00e9\u00e9 par Newman en 1833 a perdu sa pertinence avec la d\u00e9couverte de nouvelles esp\u00e8ces, mais le nom est rest\u00e9.
Chrysostigma<\/strong>, du grec chrysos<\/em> pour or<\/em> et du grec stigma<\/em> signifiant marque<\/em> ou tache<\/em>, pour souligner la couleur dor\u00e9e des pt\u00e9rostigmas.<\/p>\n\n\n\n

<\/div>\n\n\n\n
\n
Accueil Namibie<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

C’est une esp\u00e8ce commune en Namibie et je n’avais jusqu’alors rencontr\u00e9 que des femelles, en Afrique du Sud, tr\u00e8s jeune, puis en Ethiopie, bien \u00e2g\u00e9e. Mais m\u00eame sur ces femelles, on met bien en \u00e9vidence la principale caract\u00e9ristique qui permet son identification, cette bande claire thoracique qu’on ne voit ici qu’en cliquant sur la photo. […]<\/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":[278,274],"tags":[276,301],"class_list":["post-5222","post","type-post","status-publish","format-image","hentry","category-libellulidae-namibie-2","category-namibie","tag-odonates-de-namibie-namibian-odonates","tag-orthetrum-chrysostigma-namibie","post_format-post-format-image"],"yoast_head":"\nOrthetrum chrysostigma - 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