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== The Pin-Worms ==
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=== General Apperance ===
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*Non-bursate.
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*Female tail long and tapering.
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*Pharynx is double-bulbed.
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=== General Life-Cycle ===
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*Direct and non-migratory.
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*Live in the large intestine.
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*Eggs are deposited on perineal skin.
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*Eggs are asymmetrical and have an operculum at one end.
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