Abstract: A taxonomic overview on Stephanodiscus Ehr., Centricae, Bacillariophyta were carried out in this study. Seven taxa including species, varieties and forma were described dealing with their morphology, taxonomy, location, habit and distribution. A comparison among these species was made so as to clarify the taxonomic confusion existed before in Stephanodiscus.A discussion relating to the taxonomic problems was made in this paper as well.