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Ribbonworms. These animals are longer than flatworms, and not as showy. Many are white, with dark stripes or bands. They tend to live under rocks and corals or in the sand, and are most likely to be seen by divers at night. Some can grow to astonishing sizes, as much as several meters. They feed on molluscs and other worms.
Tongueworms. The tongue-worm Bonellia can be seen on reef slopes. However, it hides its sac-like body in a crevice, with only a forked proboscis protruding, is easily overlooked. These animals have an unusual sex life. All the fully formed Bonellia are females; if a larva settles into an area where there are no worms, it becomes a female. If there are already Bonellia established in the area, the larva passes into the body of an adult, becoming a dwarf male, which lives like a parasite on the female "host."
Two do rid nudibranchs, Notodoris citrina (top) and Nem-broth a sp. Nudibranchs tend to be very prey-specific. Nembrotha, as is shown here, feeds only on hydroids. Notodoris was photographed in Halma-hera, Maluku; Nembrotha in Flores.