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platyhelminthes    
扁形动物

扁形动物


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  • Flatworm - Wikipedia
    Platyhelminthes (from Ancient Greek πλατύ platy 'flat' and ἕλμινς helmins 'parasitic worm') [4] is a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates commonly called flatworms or flat worms
  • Flatworm | Reproduction, Examples, Characteristics | Britannica
    Flatworm, any of the phylum Platyhelminthes, a group of soft-bodied, usually much flattened invertebrates Several species are free-living, but about 80 percent are parasitic They are bilaterally symmetrical and lack specialized respiratory, skeletal, and circulatory systems; no body cavity (coelom) is present
  • Phylum Platyhelminthes- characteristics, classification, examples
    Phylum Platyhelminthes includes flatworms characterized by their soft, unsegmented bodies, and is classified into Turbellaria, Trematoda, and Cestoda classes
  • Platyhelminthes - Examples, Characteristics, Species, Habitat
    Platyhelminthes – Examples, Characteristics, Species, Habitat Platyhelminthes, commonly known as flatworms, are a diverse phylum of simple, bilaterally symmetrical, and unsegmented invertebrates They exhibit a dorsoventrally flattened body and include free-living forms like planarians, as well as parasitic species such as tapeworms and flukes
  • Introduction to the Platyhelminthes
    Introduction to the Platyhelminthes Life in two dimensions The simplest animals that are bilaterally symmetrical and triploblastic (composed of three fundamental cell layers) are the Platyhelminthes, the flatworms Flatworms have no body cavity other than the gut (and the smallest free-living forms may even lack that!) and lack an anus; the same pharyngeal opening both takes in food and
  • 28. 3B: Phylum Platyhelminthes - Biology LibreTexts
    Phylum Platyhelminthes Phylum Platyhelminthes is composed of the flatworms: acoelomate organisms that include many free-living and parasitic forms Most of the flatworms are classified in the superphylum Lophotrochozoa, which also includes the mollusks and annelids The Platyhelminthes consist of two lineages: the Catenulida and the Rhabditophora The Catenulida, or “chain worms” is a
  • Platyhelminthes - GeeksforGeeks
    Phylum Platyhelminthes is a phylum of invertebrates that consists of organisms that are bilaterally symmetrical and unsegmented Usually, species in this phylum are known as flatworms or tapeworms as they have flat bodies
  • Characteristics of Platyhelminthes - BYJUS
    Phylum Platyhelminthes belongs to kingdom Animalia This phylum includes 13,000 species The organisms are also known as flatworms These are acoelomates and they include many free-living and parasitic life forms Members of this phylum range in size from a single-celled organism to around 2-3 feet long Characteristics of Platyhelminthes Platyhelminthes have the following important
  • Platyhelminthes (flatworms) | INFORMATION | Animal Diversity Web
    Flatworms are unsegmented, bilaterally symmetrical worms that lack a coelom (acoelomate) but that do have three germ layers Some forms are free living but many are parasitic Flatworms have a cephalized nervous system that consists of head ganglion, usually attached to longitudinal nerve cords that are interconnected across the body by transverse branches Excretion and osmoregulation by
  • Phylum Platyhelminthes: Classification and Features
    Platyhelminthes is considered to be one of the primitive triploblastic groups Platyhelminthes or flatworms are a diverse group comprising of 25000 living species that show evolutionary achieve­ments over the diplo-blasts in having a struc­tural body plan that is based on bilateral symmetry and in having definite organs or system of organs





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