Platycheirus sp.? - Platycheirus trichopus

Moved

Moved from Platycheirus.

Keyed using Young et al 2016:

1: female -> 79
79: oral margin has a corner -> 80
80: facial pollinosity rippled -> 120
120: facial pollinosity rippled -> 124
124: vertex with two pollinose triangles -> 125
125: face moderately produced below -> 126
126: face produced slightly beyond tubercule, only tubercule shining, Western -> P. trichopus

… Kelsey J.R.P. Byers, 7 December, 2016 - 11:18am

Moved

Moved from ID Request.

… Kelsey J.R.P. Byers, 17 December, 2015 - 3:57pm

Yes. Platycheirus...... femal

Yes. Platycheirus...... female

… Bill Dean, 17 December, 2015 - 11:09am

Platycheirus

Thanks, Bill. What characters that would show in a live photo would be needed to narrow down the id, maybe to species in some cases?

… Robert P. Sikora, 17 December, 2015 - 11:30am

It differs with different gro

It differs with different groups. Sometimes an important character can`t be seen so other supporting characters have to be used. The secret is to take as many pictures as possible from different angles.
Face, abdomen, legs, wing venation. Side view and top view.
In this specimen - Black ground colour of face.
Face with a central prominence.
Porrect antennae( sticking forward ) but with a dorsal arista.
Female ( eyes separated ).
Abdomen parallel sided.
The mouth margin extending well forward of the knob on the face in some Platycheirus.
The dull bronze markings on tergites found in some species of Platycheitus ( usually yellow orange and then the front tarsi are usually flattened and expanded, especially in the male.)

… Bill Dean, 17 December, 2015 - 5:10pm

Got it.

Great answer. Again, thanks.

… Robert P. Sikora, 17 December, 2015 - 5:22pm