Description: The diatom genus Diploneis is composed predominantly of marine forms with some freshwater lineages, which are all highly diverse in morphology. In this talk I will focus on the richness of freshwater Diploneis species and their great morphological disparity of characters. This has led some researchers to separate the genus into several subdivisions or subgenera. I will then present the taxonomic problems related to the identification of freshwater species within the genus Diploneis, with examples given from most common and widespread species such as D. ovalis, D. krammeri, D. elliptica, D. subovalis, D. pseudovalis, D. separanda, D. fontanella, D. parma and D. marginestriata.

Target audience: This talk is aimed at anyone interested in the freshwater richness of Diploneis species.