Ozerov, A. & Krivosheina, M. (2015)

A review of the genera Cleigastra Macquart, Gonarcticus Becker, Gonatherus Rondani, Hexamitocera Becker, Nanna Strobl, Orthacheta Becker and Spathephilus Becker (Diptera, Scathophagidae) of Russia

. Zootaxa, 4012 (2), 201–257.