Ultrastructure of Fibrillaspora is highly similar to that of Berwaldia but the former is phylogenetically distant from the taxon annotated as Berwaldia schaefernai (Genbank accession # AY090042). It was shown recently, however, that the latter sequence was not derived from Berwaldia, and correct nucleotide sequence data were provided for Berwaldia. This allowed recondideration of Fibrillaspora as a junior synonym of Berwaldia and redefinition of Fibrillaspora daphniae as a new combination, Berwaldia daphniae comb. nov.