Superorder Neuropterida
   Order Megaloptera Latreille, 1802 - alderflies
     Family Sialidae Leach, 1815 - alderflies
       Genus Sialis Latreille, 1802 - alderfly
         Subgenus Protosialis van der Weele, 1909
           1 †Sialis baltica Wichard, 1997
           2 †Sialis herrlingi Wichard, 2002
           3 †Sialis casca M.S. Engel & D.A. Grimaldi, 2007
           4 †Sialis voigti W. Wichard & M.S. Engel, 2006
           5 Sialis bifasciata Hagen
           6 Sialis flammata (Penny)