Keys subfamilies, tribes and genera on a world basis and under regions. van Veen, M.P. |(2004) "Hoverflies of Northwest Europe, Identification Keys to the Syrphidae".
Claves de subfamilias, tribos e xéneros de todo o mundo e por rexións. van Veen, M.P. (2004) "Hoverflies of Northwest Europe, Identification Keys to the Syrphidae".