The polymorphic relationship of Cooperia oncophora (Railliet, 1898) Ransom, 1907, to Cooperia surnabada Antipin, 1931 (Nematoda: Trichostrongylidae).
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases; D005260:Female; D008297:Male; D008675:Metamorphosis, Biological; D008858:Microscopy, Phase-Contrast; D011110:Polymorphism, Genetic; D014251:Trichostrongyloidea / Q000033:anatomy & histology / Q000145:classification*; D014252:Trichostrongyloidiasis / Q000662:veterinary