Infection of the host is via ingestion of L3. They moult and transform into L4 within the small and large intestine. The larvae move to the colon where they mature into adults.
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The prepatent period is 35-40 days.
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==''O. dentatum''==
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{| cellpadding="10" cellspacing="0" border="1"
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| Also known as:
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| '''Nodular worm
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|-
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|}
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==Hosts==
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Pigs.
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==Identification==
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The adults are around 1cm in length, and have shallow buccal capsules.
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==Life Cycle==
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The larvae enter the intestine, and burrow into the wall where they remain for several weeks, forming nodules. The larvae then re-enter the lumen of the intestine where they mature, and lay eggs.