Planarian

A whole planarian. The head is on the left, we can see the ocelli (eye spots) and auricles (triangular outgrowths from the head). Image by Marc Perkins.

For example, the phylum Platyhelminthes (Flatworms) includes flatworms, the planarians, flukes and tapeworms. of these, planarians are free-living (non-parasitic) worms that live in saltwater habitats but can also occur in freshwater.


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