Thread subject: Diptera.info :: Chironomidae
Posted by nielsyese on 18-03-2012 15:04
#1
Can someone make a genus ID? 8,2 mm. Found in Yerseke, the Netherlands. For pictures, see
http://waarneming...w/63771469
Posted by John Carr on 18-03-2012 15:43
#2
Probably
Chironomus (Chironomus). Does the fore tarsus have long hairs on the distal half of segment 1 and segment 2? What is the ratio of lengths of fore tibia:tarsus-1? Is the third segment of the fore tarsus distinctly shorter than the second? Does the pronotum have a broad, deep notch or a narrow, shallow notch? (The last two questions ensure that I'm not mistaking
Glyptotendipes, which has similar genitalia.)
Is it likely to have come from fresh or brackish water?
Posted by nielsyese on 20-03-2012 19:50
#3
Hi John, there are longer hairs in distal half of tarsus I, segment 1 and 2. The lenght of fore tibia is about 0,17 mm, tarsus 1 is 0,21 mm, so 1:1,24. The third segment of the fore tarsus is distinctly shorter than the second. I don't know how I should interprete the notch so I included a picture of it.
Posted by John Carr on 21-03-2012 02:53
#4
The notch I see appears to be the front of the scutum. The pronotum is much smaller and partially concealed underneath.
In
Chironomus it projects forward in the middle and has a shallow notch.
In
Glyptotendipes the notch is very broad and deep.
Also, the frontal tubercles tend to be larger in
Chironomus. They are visible between antenna bases here:
Posted by nielsyese on 23-03-2012 19:37
#5
Ah, now I see what you mean. The notch is indeed shallow and not deep.