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Abstract
This study presents a detailed morphological analysis using light and scanning electron microscopy of Cymbella gravida sp. nov. collected from the deep sediments of Laguna Potrok Aike, a maar lake in the province of Santa Cruz, Argentina. An attempt was made to describe its ecological preferences based on the diatom assemblages present in the sections where C. gravida was found. This newly proposed species is compared with two morphologically related taxa, C. terrafuegiana Krammer and C. cistula var. guarrerae Ferrario, both described from the same locality in Tierra del Fuego. Light and scanning electron microscope observations of the original material allowed the establishment of their correct taxonomy.
Acknowledgements
We thank the members of the PASADO Science Team for their help with fieldwork, sampling and scientific discussions. S. Bustos is thanked for her invaluable help with sample processing and mounting. The authors kindly acknowledge, R. Martini and A. Martignier from the University of Geneva and A. Piuz from the Muséum d'Histoire Naturelle de Genève (Switzerland) for their help with SEM imaging. We also thank D. Ariztegui for his comments on the manuscript.
This research was supported by the International Continental Scientific Drilling Program (ICDP) in the framework of the Potrok Aike Maar Lake Sediment Archive Drilling Project (PASADO). Funding for this research was provided by the Swiss National Science Foundation [FNS grants 200020-119931 and 200020-134545] to D. Ariztegui.