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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Protostomia (protostomes)
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Class Secernentea
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Order Strongylida
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Family Amidostomatidae
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Family Ancylostomidae
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Family Cloacinidae
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Family Diaphanocephalidae
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Family Dictyocaulidae
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Family Globocephalidae
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Family Heligosomatidae
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Family Metastrongylidae
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Family Ollulanidae
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Family Strongyidae
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Family Strongylacanthidae
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Family Syngamidae
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Family Trichostrongylidae
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Family Uncinariidae
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