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The Society for the study of flies (Diptera)

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#1 2017-04-13 15:07:07

jimmymac2
DF Members
Name: James McCulloch
From: West Sussex
Registered: 2015-07-10
Posts: 79
Website

Final Hedgecourt Fly

This is my fifth and final ID request for now from Hedgecourt Nature Reserve, south Surrey, on 25th March 2017.
Thanks!
James


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#2 2017-04-13 15:56:12

pbrighto
DF Members
Name: Phil Brighton
From: Warrington
Registered: 2011-10-21
Posts: 336

Re: Final Hedgecourt Fly

The way the anal vein reaches the wing margin indicates family Anthomyiidae - tricky to get to genus even when you have the specimen.

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#3 2017-04-13 19:31:01

jimmymac2
DF Members
Name: James McCulloch
From: West Sussex
Registered: 2015-07-10
Posts: 79
Website

Re: Final Hedgecourt Fly

Thanks Phil - what are the main features needed to separate genera?

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#4 2017-04-15 11:46:13

Michael Ackland
DF Members
Name: Michael Ackland
Registered: 2008-06-14
Posts: 180

Re: Final Hedgecourt Fly

Possibly Phorbia species? The main reliable features to separate genera are the male genitalia. Keys to genera based on external characters are very difficult to write, and to use. The fifth sternite in the male could be considered and external character but is rarely visible in a whole fly photo, but will often tell you the genus. You need my manuscript keys etc but one has to be a member of the Dipterists Forum, not a registered user.

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#5 2017-04-15 11:53:14

Michael Ackland
DF Members
Name: Michael Ackland
Registered: 2008-06-14
Posts: 180

Re: Final Hedgecourt Fly

The reason why I suggest Phorbia is because the abdomen is robust, cylindrical, and the profrons on the head is projecting beyond the level of the mouth margin. These characters can be found in a few other genera. Phorbia species also occur early in the year also, although some species have a second generation.

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#6 2017-04-15 13:11:16

jimmymac2
DF Members
Name: James McCulloch
From: West Sussex
Registered: 2015-07-10
Posts: 79
Website

Re: Final Hedgecourt Fly

Thanks Michael, I am hoping to learn dissection as soon as possible but unfortunately I don't think that will be too soon. I will also hopefully be a member of Dipterists' Forum soon and therefore able to use the keys.

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