Genus Xylota (Syrphidae, Diptera) in Galicia (NW Spain)

Two Xylota species have been reported in Galicia, and two more nearby. For sure:
-X. segnis
-X. xanthocnema

Nearby:
-X. ignava
-X. sylvarum

The all look similar (black slender flies, with enlarged femurs for males), but they can be divided in two groups. X. xanthocnema and X. sylvarum are black with the last segments of the abdomen yellow, but the first has all yellow hind tibiae, and X. sylvarum partially black.
X. segnis and X. ignava have most of the abdomen orange, with black tip, but X. ignava has hind tibiae with yellow tips and yellow hind tarsi. Also, deeper red abdomen

Further ID help for X. ignava:
https://www.inaturalist.org/observations/180417146

Posted on Μάρτιος 26, 2024 0616 ΜΜ by