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flatworm |
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flatworm: see Platyhelminthes Platyhelminthes (plăt'ēhĕlmĭn`thēz) ..... Click the link for more information. ; worm worm, common name for various unrelated invertebrate animals with soft, often long and slender bodies. Members of the phylum Platyhelminthes , or the flatworms, are the most primitive; they are generally small and flat-bodied and include the free-living planarians ..... Click the link for more information. . flatwormor platyhelminthAny of a phylum (Platyhelminthes) of soft-bodied, usually much-flattened worms, including both free-living and parasitic species. Flatworms live in a variety of marine, freshwater, and terrestrial habitats worldwide. They range in length from much less than an inch (a fraction of a millimeter) to 50 ft (15 m) and are of three main types: turbellarians (including the planarian), trematodes (see fluke), and cestodes (see tapeworm). Flatworms are bilaterally symmetrical and lack respiratory, skeletal, and circulatory systems and a body cavity. Turbellarians are mostly free-swimming, but trematodes and cestodes are parasites. |
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| By the end of that period, the drug-treated mice had less than one-tenth as many parasite eggs in their livers and only one-fifth as many surviving flatworms as the untreated mice did. He put the oval, filmy, yellow flatworm in a container for further study. Marine and freshwater resources provide zebrafish as an aquatic "mouse" model, swordtail aquarium fish as models for carcinogenesis, the flatworm Caenorhabditis elegans for genomics, and a variety of small freshwater species for toxicological pathway elucidation. |
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flatworm
