Molecular Biology and Evolution, Vol 10, 660-676, Copyright © 1993 by Society for Molecular Biology and Evolution
MJ Telford and PW Holland
The chaetognaths, or arrowworms, constitute a small and enigmatic phylum of
marine invertebrates whose phylogenetic affinities have long been
uncertain. A popular hypothesis is that the chaetognaths are the sister
group of the major deuterostome phyla: chordates, hemichordates, and
echinoderms. Here we attempt to determine the affinities of the
chaetognaths by using molecular sequence data. We describe the isolation
and nucleotide sequence determination of 18S ribosomal DNA from one species
of chaetognath and one acanthocephalan. Extensive phylogenetic analyses
employing a suite of phylogenetic reconstruction methods (maximum
parsimony, maximum likelihood, evolutionary parsimony, and two distance
methods) suggest that the hypothesized relationship between chaetognaths
and the deuterostomes is incorrect. In contrast, we propose that the
lineage leading to the chaetognaths arose prior to the advent of the
coelomate metazoa.
ORIGINAL ARTICLE
The phylogenetic affinities of the chaetognaths: a molecular analysis
Department of Zoology, University of Oxford, United Kingdom.
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