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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Protostomia (protostomes)
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Gastrotricha (hairy back worms)
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Class Not assigned
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Order Macrodasyda
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Family Thaumastodermatidae
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Genus Ptychostomella
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Species Ptychostomella bergensis
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Species Ptychostomella brachycephalus
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Species Ptychostomella helena
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Species Ptychostomella higginsi
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Species Ptychostomella lepidota
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Species Ptychostomella mediterranea
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Species Ptychostomella ommatophora
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Species Ptychostomella orientalis
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Species Ptychostomella papillata
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Species Ptychostomella pectinata
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Species Ptychostomella tyrrhenica
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