FlatwormsPseudocerotidae

Members of the family Pseudocerotidae are marine flatworms, typically measuring 1 to 10 cm (0.4 to 4 in) in length. They possess broad, dorsally flattened, oval or leaf-like bodies. Most species exhibit prominent pseudotentacles, which are sensory folds located along the anterior margin of the body. Many species display bright coloration, often with intricate patterns of contrasting stripes, spots, or marginal bands.

These flatworms inhabit shallow reef environments, typically found from 1 to 30 m (3 to 100 ft) deep. They are commonly observed on hard substrates such as coral rubble, beneath rocks, or occasionally on various soft corals. Pseudocerotidae are carnivorous, feeding on sessile invertebrates including sponges and tunicates. They move by gliding across surfaces using ventral cilia and can swim short distances through undulating their body margins when disturbed. Their often conspicuous and intricate patterns make them readily noticeable to divers.