Differentiation of third stage larvae of 'ovine Ostertagia' type and Trichostrongylus species.
D000818:Animals; D007814:Larva / Q000033:anatomy & histology; D010028:Ostertagia / Q000033:anatomy & histology*; D012418:Ruminants / Q000469:parasitology; D014254:Trichostrongylus / Q000033:anatomy & histology*