| Division | Chlorophyta |
| Class | Chlorophyceae |
| Order | Sphaeropleales |
| Family | Hydrodictyaceae |
| Basionym | Polyedrium minimum A.Braun |
Cells small and tetragonal with concave side and rounded angles without spines or processes. Cell wall smooth. Cells measure 6-16 μm in diameter.
Ecology
Freshwater free floating alga occurs in Lake and Ponds.