Animalia | Nematoda | Secernentea | Strongylida | Trichostrongylidae | Ostertagia
Biota | Animalia | Nematoda | Chromadorea | Chromadoria | Rhabditida | Rhabditina | Rhabditomorpha | Strongyloidea | Trichostrongylidae | Ostertagia | Ostertagia circumcincta
COL:5T6MX | COL:N | COL:NM | COL:B6L6B | COL:87BSC | COL:87BVQ | COL:8FZB5 | COL:8FZBM | COL:8RQ5J | COL:8YQC7 | COL:63H32 | COL:9WS9D
|  |  | Inglis, 1983 | Pearse, 1942 | Chitwood, 1933 | Chitwood, 1933 | De Ley & Blaxter, 2002 | Baird, 1853 | Leiper, 1912 |  | (Stadelmann, 1894) Ransom, 1907