👉 Protostomatids are a group of protozoan animals that typically inhabit freshwater environments, primarily in bodies of water like rivers and lakes. They are characterized by their small size (less than 10 micrometers), which allows them to survive in these aquatic habitats. These protostomatids have a specialized gut lining consisting of multiple layers of cells, each with distinct functions such as nutrient absorption, waste disposal, and excretion. The genus Protostoma is the most well-stud
