| Division | Chlorophyta | 
| Class | Chlorophyceae | 
| Order | Sphaeropleales | 
| Family | Scenedesmaceae | 
| Basionym | Achnanthes dimorpha Turpin | 
Colonies 8 cells arranged in linear or sub alternating rows. The marginal cells of the colony being more or less crescent shape with attenuated apices. Cells measure 14-35 μm long and 4-11 μm broad.
Ecology
Thalli collected as plankton form from Thengamputhur-Palkulam lake and Pathinettampadi lake, Mantharamputhoor pond of Agastheeswaram Taluk:and pond at Chemmuthal- Thodakulam,of Vilavancode Taluk.