In this study, D. filaria causing parasitic bronchopneumonia in sheep was observed using a scanning electron microscope. This parasite belongs to the Trichostrongyloidea super family. The oral opening of D. filaria was observed to be small and circular in shape. Lips were not evident. Any difference between anterior ends of male and female parasites was not observed in present study. In the female parasite, the anus was seen as a fissure in shape. The post anal papilla was seen near the posterior end of the female. Spicula and cloacae of male parasites were observed.