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Animal phylogeny and the ancestry of bilaterians: inferences from morphology and 18S rDNA gene sequences (2001)
| Venue: | Evol. Dev |
| Citations: | 69 - 0 self |
BibTeX
@ARTICLE{Peterson01animalphylogeny,
author = {Kevin J. Peterson and Douglas J. Eernisse},
title = {Animal phylogeny and the ancestry of bilaterians: inferences from morphology and 18S rDNA gene sequences},
journal = {Evol. Dev},
year = {2001},
volume = {3},
pages = {170--205}
}
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Abstract
SUMMARY Insight into the origin and early evolution of the animal phyla requires an understanding of how animal groups are related to one another. Thus, we set out to explore animal phylogeny by analyzing with maximum parsimony 138 morphological characters from 40 metazoan groups, and 304 18S rDNA sequences, both separately and together. Both types of data agree that arthropods are not closely related to annelids: the former group with nematodes and other molting animals (Ecdysozoa), and the latter group with molluscs and other taxa with spiral cleavage. Furthermore, neither brachiopods nor chaetognaths group with deuterostomes; brachiopods are allied with the molluscs and annelids (Lophotrochozoa), whereas chaetognaths are allied with the ecdysozoans. The major discordance between the two types of data concerns the rooting of the bilaterians, and the bilaterian sister-taxon. Morphology suggests that the root is between deuterostomes
Keyphrases
animal phylogeny rdna gene sequence chaetognath group animal phylum rdna sequence whereas chaetognath bilaterian sister-taxon data concern early evolution molting animal maximum parsimony former group spiral cleavage latter group summary insight animal group morphological character metazoan group major discordance
