Abstract
A new species of the diatom genus Stephanodiscus was recovered from Pliocene freshwater deposits in the Klamath River basin at Chiloquin, Oregon (USA). This new rhomboid-shaped taxon was found in 3 closely related deposits: Terrebone, Oregon; Chiloquin, Oregon; and Pit River, California. It is clearly separated from a similar diatom, S. eccentrica Hustedt, by the rhomboid-shaped valve and other morphological details.

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