Abstract
A species new to science, Germainiella clandestina, was discovered during experiments performed in an artificial freshwater channel. This species is described based on valve morphology typical for the genus Germainiella Lange-Bertalot et Metzeltin. The major features conforming to Germainiella are the valve face as well as a part of the mantle covered by a conopeum and the presence of very small apertures corresponding to a subconopeum canal system close to the raphe fissure. These characters clearly differentiate this taxon from the two more related genera, namely Fallacia Stickle et Mann and Pseudofallacia occulta (Krasske) Y. Liu, J.P. Kociolek et Q.X. Wang. Moreover, two chloroplasts could be observed for the first time in Germainiella, providing an additional feature to separate Germainiella and both genera cited above. Some information is given on its ecology.
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