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Abstract
A new species of Gomphonema Ehrenberg is described from the sediments of Spirogyra Lake, Signy Island, maritime Antarctica. The new species has puncta occluded by external flaps, apical pore fields composed of porelli differentiated from the puncta, an elliptical, internal stigmal opening, septa and pseudosepta. These features ally this new species with the sensu stricto group of Gomphonema. Valve shape and striae morphology separate this new species from other species of the genus.