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Abstract
Liu Y., Kociolek J.P., Fan Y and Wang Q. 2012. Pseudofallacia gen. nov., a new freshwater diatom (Bacillariophyceae) genus based on Navicula occulta Krasske. Phycologia 51: 620–626. DOI: 10.2216/11-098.1
A morphological investigation of populations of Navicula occulta Krasske from Great Xing'an Mountains (northeastern China) was undertaken. Light and scanning electron microscopic observations clearly showed that although it shared some features with Fallacia Stickle & Mann, it differed from both typical Navicula Bory and Fallacia species by several features. There were two longitudinal depressions along the narrow sternum that were covered externally by a perforated conopeum along the raphe, and there were two pores at each terminal area. Furthermore, the striae were very distinctive; they were interrupted by the conopeum at the axial area, and they had one large areola per stria, which was closed on the valve exterior. These characters differentiated this taxon from all currently described diatom genera, and a new genus, Pseudofallacia, was proposed. Based on similarities with Pseudofallacia occulta, we transferred Pseudofallacia tenera, Pseudofallacia arenaria, Pseudofallacia losevae and Pseudofallacia monoculata to the new genus. Comparisons between the new genus and other similar naviculoid genera were presented.
ACKNOWLEDGEMENTS
This work was supported by National Science Foundation of China (Grant No. 30870162 & 31100153) and Startup Foundation for Ph.D.'s of Harbin Normal University (10XBKQ07). We give special thanks to Dr. Eugene F. Stoermer for his great help. Two anonymous referees are acknowledged for their helpful comments.