Staurastrum subgracillimum is a freshwater green algae belonging to the desmid group, recognized for its star-like or cruciform shape with two symmetrical semicells connected at a central isthmus. Each semicell typically measures 30 to 100 micrometers in width and is enclosed in a cellulose-based cell wall. This algae contains chloroplasts arranged in a ribbon-like pattern for photosynthesis and reproduces through binary fission. It thrives in nutrient-rich freshwater habitats like ponds and lakes, playing a crucial role as a primary producer in aquatic ecosystems by contributing to nutrient cycling and supporting biodiversity.