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Abstract
The new genus is characterised by the presence of a valvocopula with straight and smooth margins and by round and transapically elongated pores on its surface. The valvocopula fits beneath the raphe valve and covers the valve areolae and even sometimes the raphe. The internal and external raphe ends are simple. The areolae are occluded by fine porous hymenes on the raphid valve and they are coarser on the araphid valve. Two types of areolae are present around the margin of the araphid valve. The new genus is described from Brazilian sandy beaches (Porto Belo, Brazil) and Cocconeis disculoides Hustedt is transferred to Psammococconeis, establishing a new combination.
