Subclass Bacillariophyceae incertae sedis

Genus Nanofrustulum F.E. Round, H. Hallsteinsen & E. Paasche

• Nanofrustulum trainorii (E.Morales) E.Morales - freshwater. In semi-isloated coastal stratified lake Kislo-Sladkoe (Mindolina et al., 2023); in plankton of meromictic lake Trakhtzvetnoe (Mindolina, 2025; Ivanova, 2025, personal communication).