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adult worms Anoplocephala Ascaridia galli Ascaris asexual Babesia become adult become infected bile-ducts body bovis breadth buccal capsule cells cercariae Cestoda Coenurus contain an ovum containing a larva cuticle Cysticercus diagnosis Dibothriocephalus Dipylidium caninum disease domestic stock eggs containing Eimeria encysted faeces Fasciola hepatica female worms flagellum free flagellum gambiense genera genital pores genus goats Habronema Hcemonchus contortus Heterakis horses Hydatid cyst infected animal infective larvae intermediate host known large numbers larva develops larvae larval form larval stage length life-history liver males measure miracidium Moniezia moult multiceps muscles nematodes nodules occurs oesophagus Onchocerca oocysts Ostertagia ovum Oxyuris parasites pasture pathogenic posterior poultry prophylaxis red blood rediae Schistosoma segments Small intestine snail spicules sporocyst sporozoites stain Strongylidce Strongyloidea Strongylus sucker super-family swallowed Syngamus trachea tapeworms Tcenia echinococcus Theileria tick trematodes Trichinella spiralis Trichuris trypanosome unsegmented ovum usually uterus veterinary importance vulva whilst worms measure