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Abstract
A new species of ‘fragilarioid’ diatom belonging to the genus Punctastriata Williams & Round is described from Lake Glubokoe (Moscow Area, Russia). P. glubokoensis sp. nov. shares particular features of the genus Punctastriata: multiseriate striae, lack of rimo-portulae, presence of a single apical pore field and a single apical depression. It has widely elliptical, slightly heteropolar valves, with rounded apices; lanceolate central sternum and radiate striae. Spines are located on the costae, and the base of each spine bears two small flat projections, oriented along sternum. The epicingulum consists of three elements: a wide, open valvocopula and two narrower copulae. Relationships of P. glubokoensis sp. nov. to other species In Punctastriata are discussed.