Fig. 2
From: Trichostrongyloid nematodes in ruminants of northern Iran: prevalence and molecular analysis
Light microscope view of Marshallagia and Ostertagia species isolated from ruminants in Guilan province, northern Iran. Posterior ends of males of Ostertagia trifurcata (a), Marshallagia occidentalis (b), Ostertagia lyrata (c), Ostertagia ostertagi (d), Teladorsagia circumcincta (e) and Marshallagia marshalli (f)