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Cylindrocorporidae
Family, Roundworm (Nematoda), Terrestrial
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Dictyocaulidae
Family, Roundworm (Nematoda), Terrestrial
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Diphtherophoridae
Family, Roundworm (Nematoda), Terrestrial
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Diplogastridae
Family, Roundworm (Nematoda), Terrestrial
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Diplopeltidae
Family, Roundworm (Nematoda), Marine, terrestrial
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Discolaimidae
Family, Roundworm (Nematoda), Terrestrial
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Dorylaimidae
Family, Roundworm (Nematoda), Terrestrial
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Ecphyadophoridae
Family, Roundworm (Nematoda), Terrestrial
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Ethmolaimidae
Family, Roundworm (Nematoda), Marine, terrestrial
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Hemicycliophoridae
Family, Roundworm (Nematoda), Terrestrial
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Heteroderidae
Family, Roundworm (Nematoda), Terrestrial
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Hoplolaimidae
Family, Roundworm (Nematoda), Terrestrial
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Ironidae
Family, Roundworm (Nematoda), Marine, terrestrial
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Leptolaimidae
Family, Roundworm (Nematoda), Marine, terrestrial
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Leptonchidae
Family, Roundworm (Nematoda), Terrestrial
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Longidoridae
Family, Roundworm (Nematoda), Terrestrial
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Meloidogynidae
Family, Roundworm (Nematoda), Terrestrial
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Mermithidae
Family, Roundworm (Nematoda), Marine, terrestrial
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Metateratocephalidae
Family, Roundworm (Nematoda), Terrestrial
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Monhysteridae
Family, Roundworm (Nematoda), Marine, terrestrial