VPA 211: General Veterinary Parasitology and Helminthology (3+1)

TRICHOSTRONGYLUS AXEI

Common name	Black scour worm
Size	Male : 0.23-0.44 cm, Female : 0.32-0.6 cm
Host	Sheep, cattle, buffaloes, deer and horses
Location	Abomasum and anterior duodenum
Head end	Very slender, microscopic worms. Head is not distinctly marked off. Buccal capsule, teeth, cutting plates and leaf crows absent. Excretory pore is situated on a notch at the anterior end.
Male tail end	Well - developed bursa especially lateral lobes. Dorsal lobe very small, dorsal ray slender and distally cleft. Characteristic short ventro-ventral ray. Two unequal, dissimilar twisted and spatula shaped spicules (right longer than left). Each spicule has a knob at the proximal aspect and a slender posteriorly directed spine like process on its inner aspect at about the middle. Presence of gubernaculum.