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Abstract
The morphology, systematics and ecology of a new centric diatom—CycZotelZa cretica, from Lake Kournas in the island of Crete, Greece—are reported. The morphological variation and ultrastructure of the diatom are described as revealed by light and scanning electron microscopy. The species is characterised by a smooth flat central area with one to five, mostly three, central fultoportulae, a marginal zone of striae with several marginal fultoportulae, and a single submarginal rimoportula on the valve face. The morphology of C. cretica is compared with that of other taxa in the genus Cyclotella.