Kaczmarek, Łukasz, and Łukasz Michalczyk. “Redescription of Hypsibius Microps Thulin, 1928 and H. Pallidus Thulin, 1911 (Eutardigrada: Hypsibiidae) Based on the Type Material from the Thulin Collection”. Zootaxa, vol. 2275, no. 1, Oct. 2009, pp. 60–68, doi:10.11646/zootaxa.2275.1.4.