Fig. 3

Morphology of 4 harvested L3 recovered from examined goats. a Trichostrongylus axei larva. Note a straight larva with rounded head, simple tail and blunt terminal end. No filament and the gut had 16 intestinal cells. Scale bar = 100 µm. b Trichostrongylus Colubriformis larva. Left: The whole straight larva. Scale bar = 100 µm. Middle: Anterior end showing a rounded head and the gut had 16 intestinal cells. Right: Posterior end revealing no filament tail with 2–3 tubercles (bifid structure). Scale bar = 50 µm. c Cooperia curticei larva. Note a medium-sized larva with a square-shaped head. Head bearing two refractile oval bodies at anterior end of the esophagus. The caudal tip of the sheath finer tip and vanish into nothingness. Scale bar = 100 µm. d Cooperia oncophora. Note a medium-sized larva with a square-shaped head. Scale bar = 100 µm. Inset left: Note a head bearing two refractile oval bodies at anterior end of the esophagus. Inset right: Note the caudal tip of the sheath of C. oncophora is clearly perceptible. Scale bar = 50 µm