Bertolani, R., Marley, N. & Nelson, D.R., 1999. Re-description of the genus Thulinia (Eutardigrada, Hypsibiidae) and of Thulinia augusti (Murray, 1907) comb. n. Zool. Anz. 238: 139-145.
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Nelson, D.R., Marley, N.J. & Bertolani, R., 1999. Re-description of the genus Pseudobiotus (Eutardigrda, Hypsibiidae) and of the new type species Pseudobiotus kathmanae sp.n. Zool. Anz. 238: 311-317.
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Nelson, D.R., 2002. Current Status of the Tardigrada: Evolution and Ecology. Integ. and Comp. Biol. 42 (3): 652-659. ≡
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