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Ahlstrom, E. H. (1943). A revision of the rotatorian genus Keratella with descriptions of three new species and five new varieties. Bulletin of the American Museum of Natural History, 80, 411-457, pl.35-42
Ahlstrom, E. H. (1943). A revision of the rotatorian genus Keratella with descriptions of three new species and five new varieties. Bulletin of the American Museum of Natural History, 80, 411-457, pl.35-42