Thread subject: Diptera.info :: Phorocera obscura characteristics

Posted by jck on 10-04-2019 12:31
#1

Can someone help me a bit with this species? I'm sure I've got a number in my archive but I don't know exactly what to look for. After reading pages of posts on this forum I haven't got further than hairy eyes, 3 dcs, elongated abdomen and a spring species. Are there other things to look for?

James

Posted by John Carr on 10-04-2019 13:45
#2

In tribe Exoristini the bend in vein M is a right angle with the distal section curving towards wingtip. A similar curve in M is also common in tribe Polideini (along with hairy eyes). Typically the distal part of M in Polideini approximates a quarter circle while it is more elongate in Exoristini.

Look for the strongly differentiated upper orbital bristles typical of Exoristini.

Posted by Zeegers on 10-04-2019 17:10
#3

And most of all, it is much more elongated than the vast majority of Exoristinae. First impression is more of a Sarcophagini....

Theo

Posted by jck on 10-04-2019 20:32
#4

Thank you both - just to be sure, I have chosen a couple of photos to illustrate your remarks. Are these the setae John means (indicated by the red lines)?

James

Posted by jck on 10-04-2019 20:34
#5

And is this the bend in M? I don't see much of a right angle there.

James

Posted by John Carr on 10-04-2019 20:43
#6

The arrows are correctly placed. There are normally two pairs of reclinate upper orbitals.

Also the second picture shows the large male genitalia of Phorocera.

Posted by Zeegers on 10-04-2019 21:53
#7

The extremely large male genitalia are indeed unique.
(if you include Parasetigena in Phorocera).
Also, the female genitalia are highly peculiar.

Theo

Posted by John Carr on 11-04-2019 00:50
#8

Zeegers wrote:
The extremely large male genitalia are indeed unique.
(if you include Parasetigena in Phorocera).

Theo


Genitalia are also large in the New World genus Tachinomyia, which is next to Phorocera in the recently published molecular phylogeny.

Posted by jck on 11-04-2019 06:09
#9

Many thanks. This definitely helps. The woods here are full of Tachinids at the moment and I have 26 individuals to (try to) identify in my archive.

James