Dragonflies: Emergence

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Odonata – Gomphus pulchellus – Je vous propose quelques photos de 2 émergences déjà publiées sur Libellules de et sur Aeshnature.Mauvais temps en ce 8 mai 2012; il pleut même, mais un nouveau tour à une de mes mares favorites me permet de découvrir cette larvede Gomphe gentil tout juste installée et encore bien mouillée sur une herbe:

emergence – There are 2 emergences already posted in the websites above mentioned. A larva has crept up mid-distance on a plant, 50 cm from the pond. It is raining: Sigma 150 macro

Le temps de prospecter aux proches abords et quelques minutes plus tard, nous la retrouvons descendue d’un cran et l’abdomen relevé:

A few minutes later, it has settled for the emergence:P100, mode macro

20 minutes après, legomphe craque le dos de son exuvie et entame son extirpation laborieuse. Les branchies internes, qui ne lui serviront plus dans sa nouvelle existence puisqu’elle respirera de l’air, sont abandonnées avec l’exuvie:

The Gomphidae has cracked its exuvia opened and has started its laborious extraction. The visible internal gills (white threads) are of no use and are shed with the exuvia, since the dragonfly will now breath air:

Sigma 150 macro

Les fils ou trachéobranchies, la retiennent encore et celui du bas est toujours accroché au trou respiratoire de l’imago: le metastigma.

The tracheogills are still maintaining the insect and you can see the lower one still inside the breathing orifice: the metastigma.

Sa couleur verte est due à celle de la lymphe qu’elle va évacuer rapidement dans le cours de la journée:

The green coloration is due to the lymph that will resorb during the next hours:

Ce qui m’a frappée c’est sa mandibule ouverte tout le temps de l’émergence qui a duré 1h30 environ:

Curiously, this imago kept is lower mandible opened the whole time:

Là hélas, au lieu de basculer vers l’arrière et se relever en se tenant par ses 6 pattes pour achever son développement, elle tombe au sol et je la pose délicatement sur le support le plus stable alentours: un chardon!
Je me rends compte que la lymphe s’est accumulée sur le côté du thorax et sur une patte et qu’elle allait manquer aux ailes pour un déploiement normal:

Instead of tipping its body backward and pulling back up again to hold with its 6 legs onto the stem, it fell on the ground. I delicately brought it back onto a solid support but I realised the lymph had accumulates unevenly on 2 spots and would be missing for the wings to unfold properly…

Une émergence ratée… dommage, mais ça fait partie des aléas de leur existence!

A miss, but it happens more often than one would imagine…

Emergence d’un mâle Aeschne des joncs parfaitement réussie:

Perfect emergence of a male Aeshna juncea, the Common Hawker or :

On peut voir la mâchoire imposante de l’exuvie, sous ses 2 grand yeux, lemasque avec lequel la larve attrapait sa proie par une extension fulgurante:

You can see the mask, the larva’s lower jaw with which it catches its prey with a lightning extension:

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Noushka

Passionate about Nature and photography but mostly animals and birds. I live in France at the present, but have lived in Africa for 16 years and in the U.S. for 3 years and with Australia in mind for the future. With my husband, I created and managed a Bird Park in South Africa, raising mainly psittacines; the breeding facility housed over 1000 parrots at any given time. My photography is about sharing fauna's beauty with other enthusiasts! Equipment: NIKON lenses: 300 mm F/4, 80/400 mm, 500 mm, 200/500 mm, 800 mm f5/6E,

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Noushka Wildlife

Passionate about Wildlife, Photography and Wildlife issues. I live in the south of France at the present, but have lived in Africa for 16 years, in the U.S. for 3 years. With my husband, I created and managed a BIRD PARK in South Africa, raising mainly psittacines; the breeding facility housed over 1000 parrots at any given time. I speak French and English alike and manage decently in Spanish. My photography is about sharing fauna's beauty with other enthusiasts!Equipment: ALL NIKON Cameras: D500, D750 Tele lenses: 300 mm, 500 mm, 800 mm f5/6E, Zoom lenses: 16/80 mm, 80/400 mm, 200/500 mm and: Macro 150 Sigma.* * * My work can be seen HERE:http://1000-pattes.blogspot.fr/* * * NOT ON FACEBOOK

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