, Volume 305, Issue 1–3, pp 27–35 | Cite as

Aspects of the phylogeny of Platyhelminthes based on 18S ribosomal DNA and protonephridial ultrastructure

  • K. Rohde
  • A. M. Johnson
  • P. R. Baverstock
  • N. A. Watson
Taxonomy and phylogeny


DNA studies of 23 taxa (20 platyhelminths, 1 nemertean, Homo and Artemia) and electron-microscopic studies of the protonephridia of many platyhelminths (supported by some additional ultrastructural data) have led to the following conclusions: the Neodermata are monophyletic; Temnocephalida and Dalyelliida form one clade and are not the ‘primitive’ sister group of the Neodermata; Gyrocotylidea, Amphilinidea and Eucestoda form one monophylum; Pterastericolidae and Umagillidae are dalyelliids and not the sister group of the Neodermata; and Proseriata are unlikely to be closely related with the Tricladida. A large taxon consisting of the Proseriata and some other ‘turbellarians’ may represent the sister group of the Neodermata.

Key words

Platyhelminthes phylogeny DNA ultrastructure protonephridia 


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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • K. Rohde
    • 1
  • A. M. Johnson
    • 2
  • P. R. Baverstock
    • 3
  • N. A. Watson
    • 1
  1. 1.Department of ZoologyUniversity of New EnglandN.S.W.Australia
  2. 2.Department of MicrobiologyUniversity of TechnologySydneyAustralia
  3. 3.School of Resource Science and ManagementUniversity of New England, Northern RiversLismoreAustralia

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