Posted by Sundew on 28-07-2022 23:43
#1
Hi,
On 1st July I saw this small black fly in a wetland area in southwestern Germany. I consider it a
Hydrotaea (Muscidae). With the key of D'Assis Fonseca (1968) I found that there are just a few species with the combination "knob of halteres yellow" and "frontal triangle more or less dulled by dust, frontal orbits densely grey dusted throughout". The best decision should be
H. albipuncta ("distinct blackish shine around front ocellus", middle tibia usually with a short anterodorsal on apical half" ). I feel very uncertain, however, and would therefore highly appreciate experts' opinion!
Thanks in advance, Sundew
Edited by Sundew on 30-07-2022 00:29
Posted by Sundew on 28-07-2022 23:45
#2
In the upper picture there is the short ad on T1 visible, I think. And the head detail shows the dark shiny patch around the ocelli.
Posted by Sundew on 30-07-2022 00:22
#4
Ah - "SC more proximally diverges from R1 than in Muscidae"... Somehow I don't get it, probably because of a lack of comparison. And I did not expect a
Fannia to be so small, but I actually only know
F. canicularis. The
Fannia key leaves me perplexed, so we'll better stay with "
Fannia spec.". Many thanks, Jan!