{"id":26558,"date":"2025-11-09T15:53:43","date_gmt":"2025-11-09T14:53:43","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=26558"},"modified":"2025-11-09T16:01:09","modified_gmt":"2025-11-09T15:01:09","slug":"dysphaea-dimidiata","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2025\/11\/09\/dysphaea-dimidiata\/","title":{"rendered":"Born\u00e9o, Sarawak – Dysphaea dimidiata Selys, 1853"},"content":{"rendered":"\n
\"Dysphaea<\/a>
Dysphaea dimidiata m\u00e2le, Sarawak, Rivi\u00e8re Timuoh, Annah Rais Hot Spring, 24\/03\/2025<\/figcaption><\/figure>\n\n\n\n

Dysphaea dimidiata fait partie d’un genre qui pr\u00e9sente neuf esp\u00e8ces (1) dont trois sont pr\u00e9sentes \u00e0 Born\u00e9o et au Sarawak (2) en particulier. Consid\u00e9r\u00e9 par Selys (3) comme un sous-genre des Euphaea, il est depuis Kirby un genre \u00e0 part enti\u00e8re dans la famille des Euphaeidae (une famille qui ressemble au Calopterygidae, ce qui explique pourquoi Selys l’a d\u00e9crit dans son Synopsis des Calopt\u00e9rygines<\/em>).<\/p>\n\n\n\n

\"Dysphaea<\/a>
Dysphaea dimidiata m\u00e2le, Sarawak, Rivi\u00e8re Timuoh, Annah Rais Hot Spring, 24\/03\/2025<\/figcaption><\/figure>\n\n\n\n

C’est un magnifique zygopt\u00e8re aux allures d’anisopt\u00e8re lorsqu’il se repose sur un support en \u00e9cartant les ailes, les positionnant comme nombre de Libellulidae dans un plan inf\u00e9rieur \u00e0 celui du thorax. Ainsi, il affiche toute la beaut\u00e9 de ses ailes tr\u00e8s largement tach\u00e9e de noir, coloration qui renvoie des reflets violets sous certaines incidences.
Les anglo-saxons l’appellent Black velvetwings, soit tr\u00e8s po\u00e9tiquement \u00ab\u00a0Ailes de velours noir\u00a0\u00bb…

La proportion respective des zones hyalines et color\u00e9es est variable dans son aire de r\u00e9partition, mais l’aile ant\u00e9rieure montre toujours une zone hyaline plus importante.
Ceux que j’avais rencontr\u00e9s en Malaisie P\u00e9ninsulaire<\/a> pr\u00e9sentaient tout \u00e0 fait le m\u00eame type de r\u00e9partition. On trouvera d’ailleurs sur cette page des photos d’accouplement qui sont l’occasion de voir une femelle que nous n’avons pas rencontr\u00e9e au Sarawak.<\/p>\n\n\n\n

\n
\"Dysphaea<\/a><\/figure>\n\n\n\n
\"Dysphaea<\/a><\/figure>\n
Dysphaea dimidiata m\u00e2le, Sarawak, Rivi\u00e8re Timuoh, Annah Rais Hot Spring, 24\/03\/2025<\/figcaption><\/figure>\n\n\n\n
<\/div>\n\n\n\n
\n

Nous les avons rencontr\u00e9s sur une large rivi\u00e8re, la Timuoh River, un milieu assez ouvert, avec un fond tapiss\u00e9 de cailloux et de graviers et o\u00f9 par endroits des troncs immerg\u00e9s ou des rochers entravaient le courant. Ils aiment se poser sur ce type de support dominant le courant, d’o\u00f9 ils s’envolent brusquement pour attraper une proie ou chasser un concurrent et revenir le plus souvent \u00e0 la m\u00eame place.

\u00c0 noter que c’\u00e9tait notre premier jour de beau temps apr\u00e8s six jours essentiellement pluvieux.

Sur cette rivi\u00e8re, il se trouvait en compagnie de Neurothemis longipes<\/a>, Libellago stictica<\/a>, Libellago semiopaca<\/a>, Rhinagrion borneense<\/a>, Onychothemis coccinea<\/a>, Pseudagrion perfuscatum<\/a>, sans compter le cort\u00e8ge des esp\u00e8ces bien communes sur ce milieu comme Heliocypha biseriata, Prodasineura verticalis et m\u00eame les Orthetrum schneideri et testaceum !<\/p>\n\n\n\n

Sarawak, Rivi\u00e8re Timuoh, Annah Rais Hot Spring, 24\/03\/2025<\/span><\/p>\n<\/div>

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

Selon Ngiam & Ng (4), \u00e0 Singapour, il mesure 44 \u00e0 48 mm.
H\u00e4m\u00e4l\u00e4inen, Dow & Stokvis (1) nous signalent que l’abdomen du lectotype<\/a>, sans les appendices anaux, mesure 35 mm, ce qui lui donne une taille d’environ 44 mm. Lectotype, car il n’y a pas d’holotype<\/a> m\u00e2le d\u00e9sign\u00e9 par Selys, sa collection comportant cinq sujets \u00e9pingl\u00e9s et pour en faire une description tr\u00e8s pr\u00e9cise, les auteurs ont d\u00fb choisir le sujet le mieux conserv\u00e9.<\/p>\n\n\n\n

\"Dysphaea<\/a>
Dysphaea dimidiata m\u00e2le, Sarawak, Rivi\u00e8re Timuoh, Annah Rais Hot Spring, 24\/03\/2025<\/figcaption><\/figure>\n\n\n\n

Sa distribution s’\u00e9tend de l’extr\u00eame sud de la Tha\u00eflande et \u00e0 travers la Malaisie et Singapour, \u00e0 Java et au nord de Sumatra, et plus au nord, bien s\u00fbr \u00e0 Born\u00e9o, puis Palawan.
IUCN Red List<\/a>.<\/p>\n\n\n\n

\"Dysphaea<\/a>
Dysphaea dimidiata m\u00e2le, Sarawak, Rivi\u00e8re Timuoh, Annah Rais Hot Spring, 24\/03\/2025<\/figcaption><\/figure>\n\n\n\n
<\/div>\n\n\n\n
\"\"<\/a><\/figure>
\n

\u00c9tymologie<\/strong>
Dysphaea<\/strong> vient de deux mots grecs, dys<\/em> signifiant mal<\/em> ou traduisant une anomalie,<\/em> et de phaios<\/em> signifiant sombre<\/em>, obscure<\/em> (et sans doute pas de pha\u00fbos (?), qui signifierait brillant, comme le sugg\u00e8rent Ngiam & Ng (4)). Lorsque Selys cr\u00e9e ce genre, il l’\u00e9tablit comme un sous-genre des Euphaea et tous les Euphaea connus \u00e0 cette \u00e9poque, qu’il d\u00e9crit dans le m\u00eame document, ont les ailes noir\u00e2tres ou partiellement noir\u00e2tres, utilisant eu<\/em> qui signifie bien<\/em>, vrai<\/em> et phaea<\/em> pour sombre comme on vient de le voir et qui signifie donc \u00ab\u00a0ailes bien sombres\u00a0\u00bb. Il aurait peut-\u00eatre appel\u00e9 autrement ce genre s’il avait alors connu Euphaea ochracea<\/a>, qu’il d\u00e9crira en 1859 et qui fait exception avec ses ailes… ocr\u00e9es.
Mais aucun de ces Euphaea ne pr\u00e9sentait alors cette alternance sombre \/ clair \/ sombre, comme ce Dysphaea dimidiata pour lequel il cr\u00e9e le genre, qui pr\u00e9sente donc une anomalie.
Dimidiata<\/strong> vient du latin dimidiatus<\/em> qui signifie divis\u00e9 par moiti\u00e9<\/em>, coup\u00e9 en deux<\/em> et insiste sur le fait que l’aile sombre est ici coup\u00e9e en deux par une zone claire.<\/p>\n<\/div><\/div>\n\n\n\n

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

1- H\u00e4m\u00e4l\u00e4inen,Dow & Stokvis, 2015 – Revision of the Sundaland species of the genus Dysphaea Selys, 1853 using molecular and morphological methods, with notes on allied species (Odonata: Euphaeidae)<\/a>– Zootaxa 3949(4):451-490
2- Dow, 2021 \u2013 AN ANNOTATED CHECKLIST OF THE ODONATA (INSECTA) KNOWN FROM SARAWAK WITH RECORDS TO DISTRICT LEVEL<\/a> \u2013 Sarawak Museum Journal \u00b7 January 2021
3- Selys-Longchamps, Edm. de. 1853. Synopsis des Calopt\u00e9rygines<\/a>. Bull. Acad. Belg. 20, Annexe, 1-73 – P. 54.
4- Robin Ngiam & Marcus Ng – A photographic guide to the Dragonflies and Damselflies of Singapore – John Beaufoy Publishing \u2013 2022<\/p>\n\n\n\n

<\/div>\n\n\n\n
\n
Accueil Sarawak<\/a><\/div>\n\n\n\n
Listes des Odonates d’Asie<\/a><\/div>\n\n\n\n
Listes continentales<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Dysphaea dimidiata fait partie d’un genre qui pr\u00e9sente neuf esp\u00e8ces (1) dont trois sont pr\u00e9sentes \u00e0 Born\u00e9o et au Sarawak (2) en particulier. Consid\u00e9r\u00e9 par Selys (3) comme un sous-genre des Euphaea, il est depuis Kirby un genre \u00e0 part enti\u00e8re dans la famille des Euphaeidae (une famille qui ressemble au Calopterygidae, ce qui explique […]<\/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":[38596,38612],"tags":[38599,38646],"class_list":["post-26558","post","type-post","status-publish","format-image","hentry","category-borneo-sarawak","category-euphaeidae-borneo-sarawak","tag-borneo-sarawak","tag-sarawak-euphaeidae","post_format-post-format-image"],"yoast_head":"\nDysphaea dimidiata - 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