Identification:
This flatworm belongs to the Pseudoceros genus, known for its flattened, ribbon-like bodies and striking coloration. Although the exact species remains unidentified, this individual displays distinctive patterns or vibrant hues that make it stand out on the reef. As with many Pseudoceros, the broad, undulating body and subtle pseudotentacles are key traits.

Size:
Ranges from 1.5 – 4 cm, depending on the individual.

Habitat:
Typically found on coral rubble, rocky substrates, or reef flats. It may be spotted slowly gliding across surfaces during the day.

Depth Range:
Commonly observed between 2 – 20 meters, favoring shallow reef environments.

Diet:
Feeds primarily on colonial ascidians and other small benthic organisms, using a protrusible pharynx to ingest soft tissue.

Reproduction:
Hermaphroditic and engages in the classic “penis fencing” behavior to determine which partner will inseminate the other. After fertilization, gelatinous egg ribbons are deposited on solid substrates.

Fun Fact:
Even when the exact species cannot be identified, the bright coloration of Pseudoceros flatworms often serves as a warning to predators that they may be toxic or unpalatable — an excellent example of aposematic coloration in marine life.