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| Kingdom | Animalia
– Animal, animaux, animals |
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| Subkingdom | Bilateria
– triploblasts |
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| Infrakingdom | Protostomia
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| Superphylum | Spiralia
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| Phylum | Acanthocephala Rudolphi, 1802
– spiny-headed worms, acantocéfalo, thorny-headed worms |
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| Class | Eoacanthocephala Van Cleave, 1936
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| Order | Gyracanthocephala Van Cleave, 1936
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| Family | Quadrigyridae Van Cleave, 1920
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| Subfamily | Quadrigyrinae Van Cleave, 1920
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| Genus | Quadrigyrus Van Cleave, 1920 |
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Direct Children: |
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| Species | Quadrigyrus brasiliensis Machado-Filho, 1941
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| Species | Quadrigyrus chinensis Mao, 1979
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| Species | Quadrigyrus guptai Gupta and Gunjan-Sinh, 1992
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| Species | Quadrigyrus machadoi Fabio, 1983
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| Species | Quadrigyrus nickoli Schmidt and Hugghins, 1973
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| Species | Quadrigyrus polyspinosus Li, 1984
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| Species | Quadrigyrus rhodei Wang, 1980
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| Species | Quadrigyrus simhai Gupta and Fatma, 1986
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| Species | Quadrigyrus torquatus Van Cleave, 1920
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