Aspects of the phylogeny of Platyhelminthes based on 18S ribosomal DNA and protonephridial ultrastructure |
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| Authors: | K. Rohde A. M. Johnson P. R. Baverstock N. A. Watson |
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| Affiliation: | (1) Department of Zoology, University of New England, Armidale, 2351 N.S.W., Australia;(2) Department of Microbiology, University of Technology, Westbourne Street, Gore Hill, 2065 Sydney, N.S.W., Australia;(3) School of Resource Science and Management, University of New England, Northern Rivers, 2480 Lismore, N.S.W., Australia;(4) Present address: Faculty of Resource Science, Southern Cross University, 2480 Lismore, N.S.W., Australia |
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| Abstract: | 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. |
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| Keywords: | Platyhelminthes phylogeny DNA ultrastructure protonephridia |
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