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Oncholaimus
Genus, Roundworm (Nematoda), Marine
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Onyx
Genus, Roundworm (Nematoda), Marine
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Oxystomina
Genus, Roundworm (Nematoda), Marine
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Paracanthonchus
Genus, Roundworm (Nematoda), Marine
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Paracapillaria
Genus, Roundworm (Nematoda), Freshwater, marine, terrestrial
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Paracomesoma
Genus, Roundworm (Nematoda), Marine
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Paracyatholaimoides
Genus, Roundworm (Nematoda), Marine
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Paracyatholaimus
Genus, Roundworm (Nematoda), Marine, terrestrial
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Paradraconema
Genus, Roundworm (Nematoda), Marine
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Paralinhomoeus
Genus, Roundworm (Nematoda), Marine
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Paralongicyatholaimus
Genus, Roundworm (Nematoda), Marine
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Paramesacanthion
Genus, Roundworm (Nematoda), Marine
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Paramonohystera
Genus, Roundworm (Nematoda), Marine
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Parapinnanema
Genus, Roundworm (Nematoda), Marine
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Parasphaerolaimus
Genus, Roundworm (Nematoda), Marine
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Pareurystomina
Genus, Roundworm (Nematoda), Marine
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Paroxystomina
Genus, Roundworm (Nematoda), Marine
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Phanoderma
Genus, Roundworm (Nematoda), Marine
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Piscicapillaria
Genus, Roundworm (Nematoda), Freshwater, marine
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Platycoma
Genus, Roundworm (Nematoda), Marine