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 Dolichodoroidea (Chitwood, in Chitwood & Chitwood, 1950) Siddiqi, 1986 see Superfamily Tylenchoidea Örley, 1880
             Family Telotylenchidae Siddiqi, 1960
               Subfamily Merliniinae Siddiqi, 1971
                 1 Genus Merlinius Siddiqi, 1970
                 2 Genus Amplimerlinius Siddiqi, 1976
                 3 Genus Geocenamus Thorne & Malek, 1968
                 4 Genus Nagelus Thorne & Malek, 1968
                 5 Genus Scutylenchus Jairajpuri, 1971
                 6 ?Genus Tetylenchus Filipjev, 1936