Acta Palaeobotanica 31(1-2): 245-259, 1991

Stephanodiscus peculiaris Khurs. (Bacillariophyceae) from Ferdynandów Interglacial.

Summary: In the Pleistocene sediments of the Ferdynandów profile (Eastern Poland) Stephanodiscus peculiaris has shown high degree of variability. The study of this taxon in scanning electron microscope provides new informations on its morphology in comparison to the earlier description from the type material of Byelorussia. Furthermore var. ferdynandoviensis as var. nova is distinguished: from the nominate variety it differs in larger valve diameter, higher valve mantle, the arrangement of central part of valve and more numerous rimoportulae.

Keywords: Bacillariophyceae, Interglacial, Stephanodiscus, Taxonomy, morphology, Poland