Pectinodesmus regularis is a green algae species that forms colonies (coenobia) composed of elongated, cylindrical cells with a smooth surface. These cells are relatively small and typically range from a few to several tens of micrometers in length and width. Each cell has a firm cell wall and contains chloroplasts, usually positioned along the cell wall and potentially containing pyrenoids for photosynthesis. The nucleus is centrally located within each cell. Reproduction occurs through asexual cell division within the coenobium, promoting colony growth. Pectinodesmus regularis thrives in freshwater habitats such as ponds, lakes, and slow-moving streams, where it contributes to the diversity and productivity of phytoplankton communities.