Synechocystis aquatilis is a spherical to ovoid cyanobacterium found in freshwater environments. It has a thin cell wall and contains chlorophyll-a and phycocyanin pigments, giving it a greenish-blue coloration. The species regulates buoyancy with gas vesicles and reproduces primarily through binary fission. Synechocystis aquatilis thrives in various freshwater habitats and plays a crucial role as a primary producer, contributing to oxygen production and nutrient cycling in aquatic ecosystems.