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Hi

I'm currently using the Key "Chironomidae of the Holarctic region. Keys and diagnoses. Part 3. Adult Males" by Wiederholm to identify Chironominae.

And I'm struggling with two of the following steps in the key:

" 32. Apex of fore tibia truncate with at most shallow scale lacking spur -> 33
Apex of fore tibia with well-developed scale and/or spur -> 35 "

and

"35. Apex of fore tibia with black spur similar to those on mid and hind tibia. Pars ventralis present. ->Pseudochironomus
Apex of fore tibia without spure but with scale, often bearing spine. Pars ventralis absent -> 36"

I'm not sure how a "shallow" scale is locking compared to a "well-developed" scale or how a well-developed spur looks like.


So if someone has any pictures or figures that would be really helpful!


I have attached a photo of what I believe to be a well developed scale but as I said I am unsure.