Animalia | Nematoda | Secernentea | Strongylida | Trichostrongylidae | Ostertagia
Biota | Animalia | Nematoda | Chromadorea | Chromadoria | Rhabditida | Rhabditina | Rhabditomorpha | Strongyloidea | Trichostrongylidae | Ostertagia | Ostertagia circumcincta
|  |  | Inglis, 1983 | Pearse, 1942 | Chitwood, 1933 | Chitwood, 1933 | De Ley & Blaxter, 2002 | Baird, 1853 | Leiper, 1912 | Ransom, 1907 | (Stadelmann, 1894) Ransom, 1907