tricladida |
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| navigate by keyword : animal aquarium aquatic canal cavity cell climbing closeup disease excretory eyes flat flatworm freshwater gastrovascular giant healthy illustration isolated laboratory microscopic mouth mucus nature nervous parasite pharynx planaria planarian pond river science sea tricladida water worm zoology |
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| A planarian is one of many flatworms of the traditional class Turbellaria. It usually describes free-living flatworms of the order Tricladida |
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