Photoreceptors are simple ocelli (singular - ocellus).Head called auricles, though they have nothing to do with hearing. Chemoreceptors are located on flaplike extensions of the.Their nervous systems and other organisms are the best developed of the flatworms. The planarians are the most cephalized flatworms. Platyhelminthes: Free-living flatworms (> 4500 species) Simple, tubular protonephridial system composed of anucleate flame cells attached to collecting tubules concentrate nitrogenous waste. reproductive system (all hermaphroditic).digestive system (primitive: mouth, but no anus). ![]()
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