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Morales, E. A.; Rivera, S. F.; Wetzel, C. E.; Novais, M. H.; Hamilton, P. B.; Hoffmann, L.; Ector, L. (2013). New epiphytic araphid diatoms in the genus Ulnaria (Bacillariophyta) from Lake Titicaca, Bolivia. Diatom Research. 29(1): 41-54.