Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Subkingdom Lycopodiobiotina Doweld (2001)
     Division †Langiophytophyta Doweld (2001) [monotypic] see Phylum Langiophytophyta Doweld (2001)
       Class †Langiophytopsida Doweld (2001)
         Order †Langiophytales Doweld (2001) [monotypic]
           Family †Langiophytaceae Doweld (2001)
             1 Genus †Caia Fanning, D.Edwards & J.B.Richardson (1990)
             2 Genus †Horneophyton Bargh. & Darrah (1938)
             3 Genus †Hostinella Barrande ex Stur (1882)
             4 Genus †Langiophyton W.Remy & Hass (1991)
             5 Genus †Pectinophyton Høeg (1935)
             6 Genus †Salopella D.Edwards & J.B.Richardson (1974)
             7 Genus †Taeniocrada D.White (1902)
             8 Genus †Tarrantia Fanning, D.Edwards & J.B.Richardson (1992)
             9 Genus †Tortilicaulis D.S.Edwards