Pseudoceros is a genus of marine flatworms in the family Pseudocerotidae, commonly found on tropical coral reefs. These polyclad flatworms are dorsoventrally flattened, soft-bodied, and leaf-like in shape They move by gliding smoothly over surfaces using tiny cilia on their undersides and muscular undulations along the body margin. Unlike parasitic flatworms, Pseudoceros species are free-living predators, feeding on small invertebrates such as ascidians, sponges, or other sessile organisms.