Phylum Nematoda Gegenbaur, 1859 - round worms
   Class Secernentea Von Linstow, 1905
     Subclass Tylenchia (Thorne, 1949) Inglis, 1983
       Order Tylenchida G. Thorne, 1949
         Suborder Hoplolaimina Chizhov & Berezina, 1988
           Superfamily Hoplolaimoidea (Filipjev, 1934) Paramonov, 1967 see Superfamily Tylenchoidea Örley, 1880
             Family Hoplolaimidae Filipjev, 1934
               Subfamily Rotylenchoidinae Whitehead, 1958
                 Genus Rotylenchus Filipjev, 1936
                   Subgenus Calvatylus (Jairajpuri & Siddiqi, 1977) M.R. Siddiqi, 2000