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Proposal for a new tapeworm order, Rhinebothriidea.

Claire J Healy1, Janine N Caira, Kirsten Jensen

  • 1Department of Natural History, Royal Ontario Museum, Toronto, Ontario, Canada.

International Journal for Parasitology
|October 22, 2008
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A new tapeworm order, Rhinebothriidea, is established to address the polyphyletic nature of Tetraphyllidea. Molecular and morphological data support this revision, refining cestode classification.

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Area of Science:

  • Parasitology
  • Molecular Phylogenetics
  • Systematic Zoology

Background:

  • The tapeworm order Tetraphyllidea is recognized as polyphyletic, necessitating taxonomic revision.
  • Previous classifications did not fully resolve the evolutionary relationships within this group.

Purpose of the Study:

  • To establish the new order Rhinebothriidea for a subset of taxa within the former phyllobothriid subfamily Rhinebothriinae.
  • To clarify the phylogenetic position of various cestode species using molecular and morphological data.

Main Methods:

  • Phylogenetic analyses were conducted using Bayesian, maximum likelihood, and parsimony methods.
  • Sequence data from complete small subunit ribosomal DNA (ssrDNA) and partial large subunit ribosomal DNA (lsrDNA) (D1-D3) were utilized for 58 cestode species.
  • Histological sections and scanning electron microscopy were employed to examine morphological features.

Main Results:

  • The establishment of the Rhinebothriidea order is supported by molecular analyses of ssrDNA and lsrDNA sequence data.
  • Morphological features, such as bothridial stalks, may characterize the new order.
  • The study identified specific genera that should be included or excluded from the Rhinebothriidea, suggesting revisions to current classifications.

Conclusions:

  • The proposed Rhinebothriidea order represents a significant revision of the Tetraphyllidea, addressing its polyphyletic nature.
  • Molecular data strongly support the monophyly of Rhinebothriidea, with morphological evidence providing additional characterization.
  • Further research is needed to stabilize intraordinal relationships and reorganize Rhinebothriidean families.