Enterobius vermicularis

Domain: Eukaryota • Regnum: Animalia • Subregnum: Eumetazoa • Cladus: Bilateria • Superphylum: Protostomia • (Unranked): Ecdysozoa • Phylum: Nematoda • Classis: Chromadorea • Ordo: Oxyurida • Familia: Oxyuridae • Genus: Enterobius • Species: Enterobius vermicularis

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  the way most people get to see them
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  with heavy infections lots of dead females can show up in pants after sleep
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  male specimen with typical curled tail
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  cross-section
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  microscopic image of eggs
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  lifecycle