Brachyopa plena Collin, 1939

The problem of the taxonomic status of B. plena has been summarised by Speight (2020). All specimens from Austria we have seen were identical with B. scutellaris except for the differently shaped sensory pit on the third antennal segment. We compared the male terminalia of specimens of B. plena from Austria with specimens of B. scutellaris from southern Germany and could not see any differences. Further investigations, including DNA studies, are needed to elucidate the relationship between these names or taxa (see also van Steenis et al. 2020).