Myathropa florea male · žiedmusė ♂

EN · batman hoverfly
DE · Totenkopfschwebfliege, Gemeine Dolden-Schwebfliege
PL · kwiatówka zmierzchnicowata

https://en.wikipedia.org/wiki/Myathropa_florea
Larvae feed on bacteria in organic waterlogged detritus, often in the shallow rot holes of tree stumps.