Poteriospumella species in Vietnam with remarks on distribution and diversity of the genus.

Species of the genus Poteriospumella are reported for the first time in Vietnam and the tropical region. The investigations were conducted in the freshwaters of Vietnam using the culture method and high-throughput sequencing (V9-ITS1 rDNA metabarcoding). Fifteen cultures of Poteriospumella vasocystis were isolated from 8 water bodies in 3 provinces. Metabarcoding studies revealed 4 additional localities of this species. Additionally, two other known species of the genus Poteriospumella were revealed by the metabarcoding: P. lacustris in 19 localities and P. maldiviensis in 8 habitats. The paper discusses the distribution patterns of the detected species and the potential diversity of the genus in different climatic zones.