Flatworms are simple, bilaterian, unsegmented, soft-bodied invertebrates. They have no body cavity and no specialized circulatory and respiratory organs. Oxygen and nutrients pass through their bodies by diffusion. The single opening of the digestive cavity is used for both ingestion and egestion.Persian carpet flatworm (Bedford's flatworm), Pseudobiceros bedfordi
Polychaete worms are marine bristle worms. Each body segment has a pair of fleshy protrusions (parapodia) that bear many bristles (chaetae) made of chitin.
Filigreed coral-worm, Filograma implexa
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Last modified 4 November 2019