Oyster Leech
Oyster leeches are generally oval in shape, with greatly flattened bodies. They are common inhabitants of oyster reefs and reach 2.5 - 3.2 cm (approximately 1 inch) in length. Oyster leeches tend to hide under debris or in shells of oysters and barnacles. After mating, which can last nine hours and involve more than four partners, an individual oyster leech can deposit seven thousand to twenty-one thousand eggs. Egg masses usually are attached to clean oyster shells. The worms cover their eggs to protect them. Larvae with six eyes hatch from the eggs. The larvae swim up and away from the bottom.
Flatworms "Fencing"