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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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? Mentioned in | ? References in periodicals archive | |
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Various parasites infest modern bivalve molluscs, but at least two types of parasites leave traces in their bivalve hosts thus making them ideal for study in the fossil record: trematodes (phylum platyhelminthes, class trematoda, order digenea) and spionid polychaetes (family spionidae, genera polydora, boccardia, and pseudopolyclora) (Blake & Evans 1973, Ruiz & Lindberg 1989). an individual organism of the phylum Platyhelminthes. an individual organism of the phylum Platyhelminthes. |
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Platyhelminthe
