Platyhelminths

There are thousands of species of platyhelminths within the Great Barrier Reef Marine Park, although relatively few of them are found only in this region.

Scientists say there is high diversity among the free-living macro and meiofaunal forms, and a very large number of parasitic varieties.

Polyclad turbellarians feature vivid colours and patterns, and contribute to the aesthetic value of the Reef.

Many of the species found on the Reef occur throughout the Indo-West Pacific region.

What are Platyhelminths?

Platyhelminths are tiny marine flatworms. Most range in size between one and several millimetres, though a few are several centimetres long, and some longer than one metre. 

Where do Platyhelminths live?

Platyhelminths live in the water-filled spaces between grains of sand in the seabed.

How do Platyhelminths move?

Platyhelminths have cilia along the sides of their bodies that enable them to move through sand or water. Some move by contracting their muscles, and others swim.

What do Platyhelminths eat?

Most are carnivorous, eating tiny invertebrates small enough to be caught. Others feed on the dead bodies of animals that have sunk to the seabed. Such animals help keep the sea clean.