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Diptera.info :: Identification queries :: Diptera (adults)
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Pleustonic Empididae - São Paulo, Brazil
Walther Ishikawa
#1 Print Post
Posted on 08-10-2017 01:58
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Hello! These Diptera were photographed in small streams in Atlantic Forest, São Paulo State, Brazil. Serra da Cantareira Park - Núcleo Engordador. There were swarms of these insects hovering in the water surface, together with Gerridae and Velidae.
I think they are Empididae, but I didn´t found papers describing this behavior, they are common just above the water, but I never found any mention of a really pleustonic species. It seems that they have hydrophobous fur in the legs.

Can anybody confirm the ID? Any information about this behavior?
Thank you very much!!

farm5.staticflickr.com/4451/23708046928_8d8daf91be_z.jpg
farm5.staticflickr.com/4497/23708046108_eca3ab1161_z.jpg
farm5.staticflickr.com/4443/37560225571_433ce73d56_z.jpg

A video: https://youtu.be/...
 
John Carr
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Posted on 08-10-2017 20:15
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Many species of Hilara and Rhamphomyia (Megacyttarus) swarm low above water, but your fly is neither of those groups. Hilara and, as far as I know, Brazilian relatives, have forked R4+5.

If it is tribe Empidini it should be Porphyrochroa. Rhamphomyia has shorter first flagellomere. Macrostomus has a reduced anal lobe. If it is, you should find your species here: http://www.tandfo...0903437333. (I do not have access to the journal.)
Edited by John Carr on 08-10-2017 20:16
 
http://www.flickr.com/photos/31715949@N00
Walther Ishikawa
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Posted on 08-10-2017 22:25
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Thank you very much, John!!
If I have some news, I will update the thread.

All the best!
W.
 
crex
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Posted on 09-10-2017 22:35
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PDF
 
Walther Ishikawa
#5 Print Post
Posted on 11-10-2017 01:46
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Thank you very much crex!
All the best!
W.
 
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