The organism described is typically found in stagnant freshwater environments, often where algae are present. It exhibits various shapes such as short or elongated spindles, cylindrical forms, or band-like structures. The cell’s pellicle is characterized by longitudinal or spiral striae, with some variants having a highly flexible pellicle or regularly twisted spirals. A stigma is typically located at the anterior end. Chromatophores, responsible for photosynthesis, vary in shape from numerous discoid or band-like structures to fusiform shapes. Pyrenoids, which may or may not be surrounded by a starch envelope, and paramylum bodies, either two located near the nucleus or scattered throughout the cell, are also present. A small contractile vacuole is situated near the reservoir. Reproduction primarily occurs through asexual longitudinal fission, although sexual reproduction has been observed in certain species like Euglena sanguinea. In high numbers, these organisms can form a green film on the water’s surface, and their resting stages or cysts can create noticeable green patches on the bottom of ponds or pools.