anal papillae
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口两侧各有一对钩，虫体布满似乳突状小棘，只有成虫前端和末端两侧可见散在的隆起的椭圆孔状感觉器，虫体末端腹面可见肛孔。
There was a pair of curved hamuli on both sides of the mouth, while small spines like mastoid process were covered with the shape of the body.
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