Crucigenia tetrapedia, a green algae species, forms colonies known as coenobia consisting of four cells arranged in a cross-like pattern. Each cell is square or rectangular in shape, contributing to the cruciate appearance of the colony. These cells are relatively small, typically ranging from a few to several tens of micrometers in size, with smooth cell walls providing structural support. Within each cell, chloroplasts are parietal and essential for photosynthesis, often containing pyrenoids. The nucleus is centrally located in each cell. Reproduction occurs through asexual cell division within the coenobium, expanding the colony. Commonly found in freshwater environments like ponds and lakes, Crucigenia tetrapedia plays a role in freshwater phytoplankton communities, thriving in these aquatic habitats.