Diptera.info

Posted by blowave on 15-03-2011 20:31

Hi!

This was inside on 5th September 2010, near Lincoln UK.

Size ~3mm. I wondered if anyone had a clue of what it is due to the colour!

1 pic + 1 crop

Janet :)

Edited by blowave on 16-03-2011 21:19

Posted by blowave on 16-03-2011 21:17

Yes Sara, it is exceptionally nice! :D

I have been searching on Bug-guide, John Carr has mentioned that:

Gall midges with five tarsal segments, first longer than second are Lestremiinae.

I think the first tarsal segment is longer than the second, and it has 5 segments!

Posted by Sara21392 on 16-03-2011 22:38

Janet! I can't see 4th and 5th segments tarsi? (Could you please show me?) :| Are they last segments?

Posted by blowave on 16-03-2011 22:55

Sara21392 wrote:
Janet! I can't see 4th and 5th segments tarsi? (Could you please show me?) :| Are they last segments?

A big HMMMMM! I'm not sure I can see them now! I thought I saw a joint where I have put a funny ? next to the line, but its not obvious and I can't see it on the first tarsus. :| I lightened it a little to see better..

Edited by blowave on 16-03-2011 22:56

Posted by Sara21392 on 16-03-2011 23:31

Well, I think I can see it on first leg (blue line!!) but I couldn't see it on second leg! B) What do you think?? :)

Edited by Sara21392 on 16-03-2011 23:35

Posted by Sara21392 on 16-03-2011 23:42

Stephen! maybe I'm wrong!!! I'm not sure, and picture is not clearly!?
I think better again see under microscope...! :)

Posted by blowave on 17-03-2011 01:11

#10

I think I can see it on the first leg Sara! I have edited the pic a little to brighten it, and sharpened more. Where I have put the two black lines I think there is a dark line which looks like a joint, but there also looks to be a small notch just below where I have put the thin black line. :S

The original looks a little better than the uploaded pic, I think!

Edited by blowave on 17-03-2011 01:12

Posted by John Carr on 17-03-2011 02:00

#11

The "?" does not point to a segment division. The division between first and second segment is very faint. It is about twice the diameter of the tarsus from its base.

Posted by blowave on 17-03-2011 02:23

#12

John Carr wrote:
The "?" does not point to a segment division. The division between first and second segment is very faint. It is about twice the diameter of the tarsus from its base.

If I got that right John, I have put a tick next to the black line where I think the division is.. so this does mean there are 5 segments?

Posted by John Carr on 17-03-2011 02:34

#13

That's about where I see the division. The segments are fused together and the exact location of the joint may not be clear.

Posted by blowave on 17-03-2011 03:32

#14

So we are looking at a gall midge with a very short 1st and comparitively long 2nd tarsal segment.

I'm relying on your knowledge John! Does this indicate a subfamily?

Posted by Paul Beuk on 17-03-2011 09:48

#17

In Lestremiinae the first segment is not extremely shortened, in other cecidomyiids the second is much longer than the first.

Posted by Gunnar M Kvifte on 17-03-2011 10:23

#19

Lestremiinae also has ocelli present, which your specimen does not seem to have.

Posted by blowave on 19-03-2011 14:59

#20

Thank you all for the extra information!

I have checked the wing venation on drawwing, there are subfamilies given. The one which mine looks to match suggests subfamily Cecidomyiidae within the family Cecidomyiidae. Is there such a subfamily? It's not listed for here!

http://www.drawwi...idomyiidae

We only have three subfamilies listed..

http://www.dipter...hp?id=2731

I altered the pic of the wings so the venation can be seen better..

Posted by Sara21392 on 19-03-2011 22:41

#21

If I correct match, I think too, looks like Cecidomyiinae! B)

Posted by blowave on 19-03-2011 23:01

#22

Sara21392 wrote:
If I correct match, I think too, looks like Cecidomyiinae! B)

Sara, it was this one which is subfamily Cecidomyiidae (the same as the family) that looks to match, the R5 vein curves towards Cu. :)

I was wondering if that was now included in another subfamily as the reference was from 1918.

Posted by John Carr on 19-03-2011 23:47

#23

Cecidomyiinae is defined by genital features, but "usually" has the base of Rs weak or absent (e.g. a stub not quite connecting R4+5 with the base of R). Also, all gall-making species belong to Cecidomyiinae.