Anterior end of an equine strongyle showing a leaf crown (A) surrounding the opening to the buccal cavity.
Oesophagostomum with cuticular modifications at
the anterior end:
A = cephalic vesicle
B = cervical vesicle
C = Cervical alae
Anterior end of Ostertagia showing a pair of spine-like cervical papillae (A) in the esophageal region
Scanning electron micrograph of Haemonchus contortus showing cervical papillae, cuticular striations and the buccal lancet used for slitting capillaries during blood feeding
Scanning electron micrograph of Ostertagia ostertagi showing circular(B) and longitudinal cuticular striations(C). The small mouth opening or stoma is labeled A.
Anterior end of Toxocara canis, the roundworm of dogs, showing the tapering lance-shaped cervical alae (A)
Parasites and Parasitic Diseases of