| Division | Chlorophyta |
| Class | Trebouxiophyceae |
| Order | Chlorellales |
| Family | Oocystaceae |
| Basionym | Staurogenia rectangularis A. Braun |
| Synonym | Crucigenia rectangularis (Nägeli) Gay; Crucigeniella rectangularis (Nägeli) Komárek |
Colonies usually 4 celled with a small rectangular space at the center united together in multiple colonies. Cells elongate ovoid and in contact with adjacent ones at the poles and sides. Cells measure 4-10 μm in length and 3-7 μm breadth; four celled colony 10-23 μm in length and 8-16 μm in breadth.
Ecology
Freshwater alga occurs in Lakes and Ponds.