*1.5cm long, relatively slender and has a pointed tail. (Thus, it does not look like an ascarid, but is otherwise typical of the group).
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|phylum =
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*Eggs similar to those of ''Ascaridia''.
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|class =[[Nematodes|Nematoda]]
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*Life-cycle is non-migratory.
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|sub-class =
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*Earthworms can act as transport hosts.
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|order =
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*This worm is not very pathogenic – its main importance is as the '''vector of ''Histomonas meleagridis''''', the protozoan parasite that causes 'blackhead'.
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|super-family = Ascaridoidea
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*Another species of ''Heterakis'' is a serious pathogen of pheasants. This burrows deeply into the caecal mucosa causing nodule formation, leading to weight-loss and death.