Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Subkingdom Bryobiotina Campb. (1890)
     Division Bryophyta A.Braun (1864) - mosses and liverworts see Phylum Bryophyta A.Braun (1864)
       Subdivision Bryophytina Engl. (1892) see Subphylum Bryophytina Engl. (1892)
         Class Bryopsida McClatchie (1897) - mosses
           Subclass Bryidae Engl. (1892) - mosses
             Superorder Bryanae Goffinet & W.R. Buck
               Order Rhizogoniales Goffinet & W.R. Buck
                 Family Orthodontiaceae Goffinet (2000)
                   1 Genus Hymenodon Hook.f. & Wilson (1844)
                   2 Genus Leptotheca Schwägr. (1826)
                   3 Genus Orthodontium Wilson
                   4 Genus Orthodontopsis Ignatov & B.C. Tan