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Diptera.info :: Identification queries :: Diptera (adults)
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Opomyzidae genus Geomyza
Oryctes
#1 Print Post
Posted on 24-10-2019 14:09
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Posts: 7
Joined: 21.08.19

www.galerie-insecte.org/galerie/image/dos242/big/05%2009%2019%20ldh%2010c.jpg
Oryctes : France : Villeneuve-d'Ascq : 59650 : 05/09/2019
Altitude : 51 m - Taille : 4 mm environ
Réf. : 242126
www.galerie-insecte.org/galerie/image/dos242/big/05%2009%2019%20ldh%2010e.jpg
Oryctes : France : Villeneuve-d'Ascq : 59650 : 05/09/2019
Altitude : NR - Taille : 4 mm environ
Réf. : 242129
Bonjour,
I am back to the site with this little fly (4mm), the name of which is not easy to find. I met it in September on the edge of a little dried-up pool in Villeneuve-d'Ascq (north of France). No difficulty to find its family (Opomyzidae) and its genus (Geomyza) but, as usual, the question is : is it possible to give a name of species to this little fly ?
Searching for this insect in the galleries of DI and LMDI, I thought it rather could be Geomyza balachowskyi or Geomyza Hackmani. Actually, it is just hypothesis based on the "habitus" but I am not sure my photos are precise enough to decide.
Thank you in advance for your answer,
Dominique
Edited by Oryctes on 30-10-2019 17:24
 
Oryctes
#2 Print Post
Posted on 30-10-2019 17:32
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Time is passing and, up to now, I got no answer to my question. I am a little disappointed because, if possible, I would like to know the species of this fly. Of course, I wonder too what is the reason of the silence. Would I have badly formulated my initial question ? The result is that now I am asking you two questions instead of one : one on the species, one on the silence ! Smile
Dominique
 
Jan Willem
#3 Print Post
Posted on 25-01-2020 23:25
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Location: Waalwijk, The Netherlands
Posts: 1879
Joined: 24.07.04

Difficult to say without studying sternite 8. However, in G. balachowskyi the abdomen is in most cases clearly banded. It is, again in most cases, black in G. hackmani. Also the post-scutellum is normally less dark in G. balachowskyi. So I would say Geomyza cf. hackmani.
Jan Willem van Zuijlen
 
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