CLASS ADENOPHOREA von Linstow, 1905

• Order Mermithida Hyman, 1951

  • Family Mermithidae Braun, 1883

• Order Plectida Malakhov, 1982

  • Family Plectidae Örley, 1880

CLASS SECERNENTEA von Linstow, 1905

• Order Rhabditida Chitwood, 1933

  • Family Teratocephalidae Andrássy, 1958
  • Family Cephalobidae Filipjev, 1934
  • Family Brevibuccidae Paramonov, 1956
  • Family Panagrolaimidae Thorne, 1937
  • Family Myolaimidae Cobb, 1920
  • Family Rhabditidae Örley, 1880
  • Family Bunonematidae Micoletzky, 1922
  • Family Cylindrocorporidae Goodey, 1939
  • Family Pseudodiplogasteroididae Körner, 1954
  • Family Diplogasteroididae Filipjev & Schuurmans Stekhoven, 1941
  • Family Diplogastridae Micoletzky, 1922
  • Family Neodiplogastridae (Paramonov, 1952) Andrássy, 1984
  • Family unknown
  
  

• Order Tylenchida Thorne, 1949

  • Family Aphelenchoididae Skarbilovich, 1947 (Paramonov, 1953)