Psammodiscus nov. gen. Based on Coscinodiscus nitidus

Abstract
The epipsammic diatom Coscinodiscus nitidus differs from typical Coscinodiscus species in areola arrangement and structure, closing membrane structure, rimoportula arrangement, and habitat. Several similarities exist between it and Rhaphoneis species but, while the relationship between these is close, the two cannot be considered congeneric. A new genus, Psammodiscus, is created to include C. nitidus.