| Division | Euglenophyta |
| Class | Euglenophyceae |
| Order | Euglenales |
| Family | Phacaceae |
| Basionym | Phacus longicauda var. tortus Lemmermann |
Cells twisted slightly or one; anterior and posterior ends narrowed; broad at middle of the cell; posterior end with long tail, straight or bent slightly; cells measure 67-79 µm long and 34-42 µm broad. Pellicle with twisted striae; paramylon bodies 1-2, discoid.