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Arctodiaptomus (Arctodiaptomus) laticeps
Species, Crustacean, Freshwater, terrestrial
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Arctodiaptomus (Arctodiaptomus) wierzejski
Species, Crustacean, Freshwater, terrestrial
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Arctodiaptomus (Rhabdodiaptomus) alpinus
Species, Crustacean, Freshwater, terrestrial
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Arctodiaptomus (Rhabdodiaptomus) bacillifer
Species, Crustacean, Freshwater, terrestrial
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Arenosetella germanica
Species, Crustacean, Marine, terrestrial
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Arenosetella tenuissima
Species, Crustacean, Marine, terrestrial
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Argulus coregoni
Species, Crustacean, Freshwater, terrestrial
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Argulus foliaceus
Species, Crustacean, Freshwater, terrestrial
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Armadillidium album
Species, Crustacean, Marine, terrestrial
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Armadillidium assimile
Species, Crustacean, Terrestrial
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Armadillidium depressum
Species, Crustacean, Marine, terrestrial
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Armadillidium nasatum
Species, Crustacean, Marine, terrestrial
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Armadillidium pictum
Species, Crustacean, Marine, terrestrial
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Armadillidium pulchellum
Species, Crustacean, Marine, terrestrial
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Armadillidium speyeri
Species, Crustacean, Terrestrial
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Armadillidium vulgare – Common Pill Woodlouse
Species, Crustacean, Marine, terrestrial
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Artemia salina – Brine Shrimp
Species, Crustacean, Freshwater, terrestrial
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Asellus (Asellus) aquaticus – Water hog lice/slaters
Species, Crustacean, Freshwater, marine, terrestrial
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Attheyella (Attheyella) crassa
Species, Crustacean, Freshwater, terrestrial
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Attheyella gracilis
Species, Crustacean, Freshwater, terrestrial