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The phylum Platyhelminthes is constituted of about 50,000 species of flatworms, most of which are parasites of vertebrates, but many living freely in a wide variety of habitats from the deep-sea to the damp soils of tropical forests. They are, at least superficially, morphologically simple and have been considered the most primitive of multi-cellular animals. This book elucidates the position of the flatworms in the animal kingdom and the radiation of free-living and parasitic groups, by the use of established and modern systematic techniques.
The phylum Platyhelminthes is comprised of some 50,000 species of
flatworms living in a wide variety of habitats - from the deep sea
to the damp soil of tropical forests- where they occupy pivotal
roles in many ecosystems. The parasitic forms include tapeworms and
flukes, which plague virtually every species of vertebrates and
impose major medical, veterinary, and economic burdens.
Interrelationships of the Platyhelminthes elucidates the role of
flatworms in the animal kingdom. It brings together results from an
international group of experts, spanning many disciplines, who give
evidence for the phylogeny of the flatworms and constituent major
taxa. A combined approach, using traditional comparative techniques
along with the modern techniques of molecular phylogeny, is
utilized to show that the monophyly of the phylum is not fully
established, and that the phylum may in fact consist of two groups:
the acoels and their direct relatives, which are basal metazoans,
and the Rhabditophora, which is a more derived group. The authors
review the contributions of neurobiology, morphology, and
developmental and molecular biology in light of their contributions
to flatworm phylogenetics. This volume provides explicit and fully
defined character matrices wherever possible allowing critics,
supporters, and future workers to evaluate the state of flatworms
systematics and phylogenetics from a single resource. This volume
will appeal to all who have an interest in flatworms and recognize
the value of phylogenetics as the basis for comparative biology.
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