Phacus orbicularis Hübner 1886
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| Division | Euglenophyta |
| Class | Euglenophyceae |
| Order | Euglenales |
| Family | Phacaceae |
SynonymPhacus orbicularis var. undulatus Skvortsov; Phacus pleuronectes var. australis Playfair; Phacus platalea Drezepolski; Phacus ovoidea Roll; Phacus zingeri Roll; Phacus orbicularis<.i> var. caudatus Skvortsov; Phacus pleuronectes var. marginatus Skvortsov; Phacus heimii Lefèvre; Phacus orbicularis var. cingeri (Roll) Svirenko; Phacus undulatus (Skvortsov) Pochmann; Phacus thrombus Pochmann; Phacus orbicularis f. communis Popova.
Cells slightly circular; posterior end with short tail and slightly bent or sometimes more or less curved; cells measure 54-63µm long and 39-47µm broad. Pellicle shows longitudinal and transverse striae; apical furrow extended up to the middle or nearly the posterior end; paramylum bodies two, one large and placed centrally and the other small one overlapping the former eccentrically.