Scenedesmus arcuatus is a freshwater green algae characterized by its crescent or arc-shaped cells, which are part of colonial formations held together by mucilaginous matrix. Each cell is relatively small, measuring 10-20 micrometers wide and 5-30 micrometers long, and contains chloroplasts for photosynthesis. It has two flagella for movement and a cellulose-based cell wall for structure and protection. Reproduction occurs through asexual cell division, and it thrives in nutrient-rich freshwater habitats like ponds and lakes. Scenedesmus arcuatus plays a crucial role in aquatic ecosystems as a primary producer and food source.