Acanthocheilus Molin, 1858 (basis of record)
Acanthocheilus Molin, 1858 (extant flag source)
Acanthorhabdias Pereira, 1927 (extant flag source)
Acanthorhabdias Pereira, 1927 (basis of record)
Actinca Andrássy, 1964 accepted as Brasilaimus Lordello & Zamith, 1957 (basis of record)
Actinca Andrássy, 1964 accepted as Brasilaimus Lordello & Zamith, 1957 (extant flag source)
Actinolaimoides (extant flag source)
Actinolaimoides (basis of record)
Adorus Thorne, 1939 accepted as Oxystomina Filipjev, 1921 (basis of record)
Adorus Thorne, 1939 accepted as Oxystomina Filipjev, 1921 (extant flag source)
Agfa Chitwood, 1935 (extant flag source)
Agfa Chitwood, 1935 (basis of record)
Agmodorus Thorne, 1964 (basis of record)
Agmodorus Thorne, 1964 (extant flag source)
Agriostomum Railliet, 1902 (basis of record)
Agriostomum Railliet, 1902 (extant flag source)
Alaninema Théodoridès, 1957 (extant flag source)
Alaninema Théodoridès, 1957 (basis of record)
Alirhabditis Suryawanshi, 1971 (basis of record)
Alirhabditis Suryawanshi, 1971 (extant flag source)
Alloinema (extant flag source)
Alloinema (basis of record)
Anatrichosoma Smith & Chitwood, 1954 (basis of record)
Anatrichosoma Smith & Chitwood, 1954 (extant flag source)
Ancylostoma Dubini, 1843 (extant flag source)
Ancylostoma Dubini, 1843 (basis of record)
Angiostoma Dujardin, 1844 (basis of record)
Angiostoma Dujardin, 1844 (extant flag source)
Angiostrongylus Kamensky, 1905 (basis of record)
Angiostrongylus Kamensky, 1905 (extant flag source)
Anguillicola Yamaguti, 1935 (basis of record)
Anguillicola Yamaguti, 1935 (extant flag source)
Angusticaecum Baylis, 1920 (basis of record)
Angusticaecum Baylis, 1920 (extant flag source)
Anisakis Dujardin, 1844 (extant flag source)
Anisakis Dujardin, 1844 (basis of record)
Antholaimus Cobb, 1913 (basis of record)
Antholaimus Cobb, 1913 (extant flag source)
Aproctonema Keilin, 1917 (basis of record)
Aproctonema Keilin, 1917 (extant flag source)
Ascaridia Dujardin, 1844 (basis of record)
Ascaridia Dujardin, 1844 (extant flag source)
Ascaris Linnaeus, 1758 (basis of record)
Ascaris Linnaeus, 1758 (extant flag source)
Aspidonema Sachs, 1949 (extant flag source)
Aspidonema Sachs, 1949 (basis of record)
Aulolaimoides Micoletzky, 1915 (extant flag source)
Aulolaimoides Micoletzky, 1915 (basis of record)
Avioserpens Wehr & Chitwood, 1934 (extant flag source)
Avioserpens Wehr & Chitwood, 1934 (basis of record)
Belonenchus Thorne, 1964 accepted as Basirotyleptus Jairajpuri, 1964 (extant flag source)
Belonenchus Thorne, 1964 accepted as Basirotyleptus Jairajpuri, 1964 (basis of record)
Bertzuckermania Khera, 1970 (extant flag source)
Bertzuckermania Khera, 1970 (basis of record)
Bidigiticauda Chitwood, 1938 (extant flag source)
Bidigiticauda Chitwood, 1938 (basis of record)
Brasilaimus Lordello & Zamith, 1957 (extant flag source)
Brasilaimus Lordello & Zamith, 1957 (basis of record)
Brevibucca Goodey, 1935 (basis of record)
Brevibucca Goodey, 1935 (extant flag source)
Brittonema Thorne, 1967 accepted as Brasilaimus Lordello & Zamith, 1957 (basis of record)
Brittonema Thorne, 1967 accepted as Brasilaimus Lordello & Zamith, 1957 (extant flag source)
Buccolaimus Allgén, 1959 (extant flag source)
Buccolaimus Allgén, 1959 (basis of record)
Californidorus Robbins & Weiner, 1978 (basis of record)
Californidorus Robbins & Weiner, 1978 (extant flag source)
Calligyrus Lorenzen, 1969 (extant flag source)
Calligyrus Lorenzen, 1969 (basis of record)
Capillaria Zeder, 1800 (basis of record)
Capillaria Zeder, 1800 (extant flag source)
Carabonema Stammer & Wacher, 1952 (basis of record)
Carabonema Stammer & Wacher, 1952 (extant flag source)
Carcharoides Thorne, 1967 accepted as Caryboca (extant flag source)
Carcharoides Thorne, 1967 accepted as Caryboca (basis of record)
Caribenema Thorne, 1967 (basis of record)
Caribenema Thorne, 1967 (extant flag source)
Caryboca (extant flag source)
Caryboca (basis of record)
Cenolaimus Cobb, 1933 (extant flag source)
Cenolaimus Cobb, 1933 (basis of record)
Chambersiella Cobb, 1920 (basis of record)
Chambersiella Cobb, 1920 (extant flag source)
Cheilorhabditis Timm, 1959 (basis of record)
Cheilorhabditis Timm, 1959 (extant flag source)
Cheironchus Cobb, 1917 (extant flag source)
Cheironchus Cobb, 1917 (basis of record)
Cobbonchus Andrássy, 1958 (basis of record)
Cobbonchus Andrássy, 1958 (extant flag source)
Contracaecum Railliet & Henry, 1912 (extant flag source)
Contracaecum Railliet & Henry, 1912 (basis of record)
Corethrellonema (basis of record)
Corethrellonema (extant flag source)
Cosmocercoides Wilkie, 1930 (extant flag source)
Cosmocercoides Wilkie, 1930 (basis of record)
Crassicauda Leiper & Atkinson, 1914 (extant flag source)
Crassicauda Leiper & Atkinson, 1914 (basis of record)
Creagrocercus Baylis, 1943 (basis of record)
Creagrocercus Baylis, 1943 (extant flag source)
Crossophorus Ehrenberg, 1828 (basis of record)
Crossophorus Ehrenberg, 1828 (extant flag source)