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|Title: ||Filling a gap in the phylogeny of flatworms: relationships within the Rhabdocoela (Platyhelminthes), inferred from 18S ribosomal DNA sequences|
|Authors: ||Willems, Wim|
|Issue Date: ||2006|
|Publisher: ||Norwegian Academy of Science|
|Citation: ||ZOOLOGICA SCRIPTA, 35(1). p. 1-17|
|Abstract: ||The phylogeny of the Rhabdocoela, a species-rich taxon of free-living flatworms, is reconstructed
based on complete 18S rDNA sequences. The analysis includes 62 rhabdocoels
and 102 representatives of all major flatworm taxa. In total, 46 new sequences are used, 41 of them
from rhabdocoel species, five from proseriates. Phylogenetic analysis was performed using
maximum parsimony and Bayesian inference. Clade support was evaluated with parsimony
jackknifing, Bremer support indices and Bayesian posterior probabilities. The resulting cladogram
corroborates that the Rhabdocoela is monophyletic, but its sister group remains uncertain.
The ‘Dalyellioida’ and the ‘Typhloplanoida’, both former rhabdocoel subtaxa, are
polyphyletic. Within the Rhabdocoela the monophyletic Kalyptorhynchia, characterized by a
muscular proboscis, forms the sister group of all other rhabdocoels. The Schizorhynchia is a
monophyletic subtaxon of the Kalyptorhynchia, with the split proboscis as a synapomorphy.
Except for the Dalyelliidae and the Typhloplanidae, both freshwater taxa, none of the ‘families’
previously included in the ‘Typhloplanoida’ and the ‘Dalyellioida’ appears to be monophyletic.
As a result of this analysis, three existing and four new taxon names are formally
defined following the rules of the Phylocode.|
|ISI #: ||000234650400001|
|Type: ||Journal Contribution|
|Validation: ||ecoom, 2007|
|Appears in Collections: ||Research publications|
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