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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 Rhabditida
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Family Agfidae
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Family Alirhabditidae
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Family Alloionematidae
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Family Angiostomatidae
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Family Brevibuccidae
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Family Bunonematidae
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Family Carabonematidae
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Family Cephalobidae
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Family Chambersiellidae
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Family Daubayliidae
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Family Elaphonematidae
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Family Heterohabditidae
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Family Odontorhabditidae
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Family Panagrolaimidae
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Family Pangrolaimidae
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Family Pseudogasteroididae
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Family Pterygorhabditidae
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Family Rhabdiasidae
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Family Rhabditidae
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Family Rhabditonematidae
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Family Robertiidae
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Family Steinernematidae
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Family Strongyloididae
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Family Syrphonematidae
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