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Kaczmarek, Łukasz; Michalczyk, Łukasz. Redescription of Hypsibius Microps Thulin, 1928 and H. Pallidus Thulin, 1911 (Eutardigrada: Hypsibiidae) Based on the Type Material from the Thulin Collection. Zootaxa 2009, 2275, 60–68.