| Division | Chlorophyta |
| Class | Chlorophyceae |
| Order | Sphaeropleales |
| Family | Hydrodictyaceae |
Colonies circular to ellipsoid, consists of 4 to 32, rarely larger colonies with 64 or 128 cells. Colonies exhibits large perforations and various in shape. Inner cells Y-shaped, triangular to trapezoid in shape; outer cells T to Y shaped mature colonies with slender triangular cells, outer cells with a single long horn-like process with a tuft of long bristles. Cell walls granulate sometimes smooth, outer cells 18-65 μm long, 8-30 μm in diameter.
Ecology
Free floating colonies occur in oligo to mesotrophic water bodies.