---

Correct, Nikita!
Concerning "validity" of the genus (IMHO, only names are "valid", but that's garbage issue, right?) -- there is a phylogeny of the the Myennidini in Kameneva & KOrneyev 2006. which clearly shows Callopistromyia to be a part of the NA Oedopa lineage. The Holarctic "Pseudotephritis" corticalis generally lies out of the two main clades and obviously needs its own genus; however, I'd prefer Tanya Galinskaya do such a job with the molecular data should she obtain a fresh stuff from Russia.
This species has been recorded from Mongolia by Soos and from Luga by Hennig (Stackelberg's material). It is very rare compared to other Myennidini, but occurs on wet logs as well.