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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 | Ecdysozoa
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| Phylum | Arthropoda
– Artrópode, arthropodes, arthropods |
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| Subphylum | Chelicerata
– cheliceriformes, quelicerado, queliceriforme |
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| Class | Euchelicerata
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| Subclass | Arachnida
– araignées, aracnídeo, arachnids, arácnidos |
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| Superorder | Acariformes
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| Order | Trombidiformes
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| Suborder | Prostigmata
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| Infraorder | Anystina
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| Superfamily | Hydrachnoidea
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| Family | Hydrachnidae
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| Genus | Hydrachna O. F. Müller, 1776 |
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Direct Children: |
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| Species | Hydrachna baculoscutata Crowell, 1960
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| Species | Hydrachna canadensis Marshall, 1929
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| Species | Hydrachna conjecta Koenike, 1895
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| Species | Hydrachna crenulata Marshall, 1930
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| Species | Hydrachna cruenta Muller, 1776
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| Species | Hydrachna geographica Muller, 1776
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| Species | Hydrachna hesperia Lundblad, 1934
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| Species | Hydrachna hungerfordi Lundblad, 1934
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| Species | Hydrachna hutchinsoni Lundblad, 1934
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| Species | Hydrachna leegei Koenike
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| Species | Hydrachna magniscutata Marshall, 1927
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| Species | Hydrachna marshallae Lundblad, 1934
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| Species | Hydrachna microscutata Marshall, 1929
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| Species | Hydrachna miliaria Berlese, 1888
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| Species | Hydrachna mystomirabilis Habeed, 1954
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| Species | Hydrachna rotunda Marshall, 1930
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| Species | Hydrachna stipata Lundblad, 1934
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