SUPERFAMILY CEPHALOBOIDEA Filipjev, 1934
Stoma distinctly jointed; cheilorhabdion wide, rest of stoma narrower. Esophagus with cylindrical procorpus, isthmus barely seen, basal bulb with a valve. Female gonad prodelphic, reflexed down body, usually with an additional double flexure towards the end of the ovary.
Family Metacrobelidae Andrassy, 1974
Vulva close to anus.
Genus: Meacrobeles Loof, 1962
Family Cephalobidae Filpijev, 1934
Vulva far from anus.
Subfamily
Cephalobinae: Only cheilorhabdions wider than other parts.
Genera: Cephalobus Bastian,
1865
Eucephalobus Steiner, 1936
Heterocephalobus (Brzeski, 1960) Brzeski,
1961
Teratolobus Andrassy, 1968
Subfamily Acrobelinae
Thorne, 1937: Cephalic probolae shorter than labial probolae
Genera: Acrobeloides Cobb, 1924)
Thorne, 1937
Pseudacrobeles Steiner, 1938
Placodera Thorne, 1937
Chiloblacus Thorne, 1937
Cervidellus Thorne, 1937
Acrobelophis Andrassy, 1984
(Combined from Acrobeles soosi Andrassy, 1953)
Ypsilonellus Andrassy, 1984
(Combimed from Cephalobus vexilliger De Man, 1880)
Stegelleta Thorne, 1938
Syn. Stegella Thorne, 1937
Stegelletina Andrassy, 1984
(Combined from Acrobeles lineatus Thorne, 1925)
Zeldia Thorne, 1937
Scottnema Timm, 1971
Paracrobeles Heyns, 1968
Nothacrobeles Allen & Noffsinger,
1971
Acrobeles Linstow, 1877
Subfamily Kirjanoviinae Andrassy, 1976: Cephalic probolae large, paddle-shaped,
longer
than labial probolae.
Genera: Kirjanovia Ivanova,
1969
Acromoldavicus Nesterov, 1970
Subfamily Panagrocephalinae Andrassy, 1976: Cheilo- and protostom wider
and the wall
more cuticularized than other parts.
Genus: Panagrocephalus Andrassy,
1967
SUPERFAMILY PANAGROLAIMOIDEA Thorne, 1937
Family Alirhabditidae Suryawanshi, 1971
Family Panagrolaimidae Thorne, 1937
Subfamily Panagrolaiminae Thorne, 1937
Genera: Procephalobus Steiner,
1934
Panagrolaimus Fuchs, 1930
Panagrobellus Thorne, 1939
Panagrobelium Andrassy, 1984
(combined from Panagrobelus topayi Andrassy, 1960)
Subfamily Panagrellinae Andrassy, 1976
Genera: Panagrellus Thorne,
1938
Anguilluloides Rhum, 1956
Subfamily Turbatricinae Goodey, 1943
Genus: Turbatrix Peters, 1927
Subfamily Tricephalobinae Andrassy, 1976
Genera: Tricephalobus Steiner,
1936
Halicephalobus Timm, 1956
SUPERFAMILY MYOLAIMOIDEA Andrassy, 1984
SUPERFAMILY ELAPHONEMATOIDEA Heyns, 1962
Family Elaphonematidae Heyns, 1962
Subfamily Elaphonematinae Heyns, 1962
Genus: Elaphonema Heyns, 1962
SUPERFAMILY DRILONEMATOIDEA Pierantoni, 1916
Family Drilonematidae Pierantoni, 1916 or Family
Osstellidae Heyns, 1962
Subfamily Drilocephalobinae Ali, Suryawanshi & Chisti, 1973
Genus: Drilocephalobus Coomans
& Goodey, 1965
Subfamily Osstellinae Heyns, 1962
Genus: Osstella Heyns, 1962
SUPERFAMILY TERATOCEPHALOIDEAAndrassy, 1958
Family Teratocephalidae Andrassy, 1958
Subfamily Teratocephalinae Andrassy, 1958: Ovary one
Genera: Teratocephalus De Man,
1876
Steratocephalus Andrassy, 1984
Subfamily Metateratocephalinae Eroshenko, 1973: Ovary two.
Genera: Metateratocephalus Eroshenko,
1973
Euteratocephalus Andrassy, 1958
SUPERFAMILY CHAMBERSIELLOIDEA Thorne, 1937
Family Chambersiellidae Thorne, 1937
Subfamily Macrolaiminae Sanwal, 1971
Genera: Macrolaimellus Andrassy,
1966
Macrolaimus Maupas, 1900
Diastolaimus Rahm, 1928
Subfamily Chambersiellinae Thorne, 1937
Genera: Cornilaimus Truskova
& Eroshenko, 1977
Geraldius Sanwal, 1971
Chambersiella Cobb, 1920
Subfamily Bicirronematinae Andrassy, 1978
Genus: Bicirronema Andrassy,
1958
Constructed and maintained by Khuong B. Nguyen University of Florida