Philodina roseola, commonly known as the common rotifer, are microscopic aquatic organisms that inhabit various freshwater environments, including both still and flowing waters. They are commonly found in the thin water films surrounding soil particles and can thrive in diverse moist habitats such as mosses, lichens, soil litter, sewage treatment plants, mushrooms, and on other microscopic organisms. Despite their small size, they possess specialized organs and a complete digestive tract, which categorizes them as animals. The head of the rotifer is encircled by a corona of cilia, creating a vortex of water that is drawn into the mouth for feeding. Food particles are then sifted from the water and ground by trophi, or jaws, located in the pharynx. The rotifer’s toe terminates in a cement gland, enabling it to attach to surfaces and feed without drifting away. They exhibit remarkable resilience, capable of surviving periods of drying through a process called cryptobiosis, which halts all metabolic processes. Rotifers serve as a dependable food source for various aquatic organisms including copepods, fish, starfish, and jellyfish.