Hippa, H. & Vilkamaa, P., 2006. Phylogeny of the Sciaroidea (Diptera): the implication of additional taxa and character data. Zootaxa, 20, pp.63-68. Available at: http://www.online-keys.net/sciaroidea/2000_/Hippa_&_Wilkamaa_2006_Scioroidea_phylogeny.pdf.