Abstract
The animals in the phylum Platyhelminthes are flat worms, as their name should suggest, and they include the planarians, flukes and tapeworms. In contrast to the cnidarians they are bilaterally symmetrical and have well-developed organ systems, and in contrast to the annelid worms they have no coelom (the spaces between the various organs being filled with a special connective tissue called parenchyma), no blood vascular system and are not metamerically segmented (the replication of genitalia in tapeworms is discussed on p. 219).
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© 1972 Macmillan Publishers Limited
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Llewellyn, J. (1972). Phylum Platyhelminthes. In: Marshall, A.J., Williams, W.D. (eds) Textbook of Zoology. Palgrave, London. https://doi.org/10.1007/978-1-349-02495-7_5
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DOI: https://doi.org/10.1007/978-1-349-02495-7_5
Publisher Name: Palgrave, London
Print ISBN: 978-0-333-17868-3
Online ISBN: 978-1-349-02495-7
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