Phacus cordatus is a unicellular protist belonging to the Euglenaceae family. It has a slender, curved body resembling a spindle, typically 20-60 micrometers long. The cell features two flagella emerging from a reservoir, an eyespot for light detection, and numerous chloroplasts for photosynthesis. Its pellicle is striated, aiding flexibility, and it possesses a contractile vacuole for osmotic regulation. Reproduction occurs via binary fission. Found in freshwater environments, P. cordatus is identifiable by its unique morphology and ecological adaptations.