Evidence for a clade of nematodes, arthropods and other moulting animals

@article{Aguinaldo1997EvidenceFA,
  title={Evidence for a clade of nematodes, arthropods and other moulting animals},
  author={Anna Marie A. Aguinaldo and James M. Turbeville and Lawrence S. Linford and Maria C. Rivera and James R. Garey and Rudolf A. Raff and James Alan Lake},
  journal={Nature},
  year={1997},
  volume={387},
  pages={489-493}
}
The arthropods constitute the most diverse animal group, but, despite their rich fossil record and a century of study, their phylogenetic relationships remain unclear1. Taxa previously proposed to be sister groups to the arthropods include Annelida, Onychophora, Tardigrada and others, but hypotheses of phylogenetic relationships have been conflicting2,3. For example, onychophorans, like arthropods, moult periodically, have an arthropod arrangement of haemocoel1,4, and have been related to… 
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1,493 Citations

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References

SHOWING 1-10 OF 25 REFERENCES

Annelida and Arthropoda are Not Sister Taxa: A Phylogenetic Analysis of Spiralian Metazoan Morphology

TLDR
This study presents a new analysis of 141 independently assembled characters, purported to represent the current state of knowledge of metazoan morphology and embryology, and results in robust support of the Eutrochozoa hypothesis.

Evidence from 12S ribosomal RNA sequences that onychophorans are modified arthropods.

TLDR
Parsimony analysis suggests that onychophorans form a sister group to chelicerates and crustaceans plus hexapods, but this relationship is not well supported by monophyly testing, which conflict with current hypotheses of evolutionary pathways within arthropods.

A Cladistic Analysis of Pseudocoelomate (Aschelminth) Morphology

TLDR
It is concluded that there are 2 main lines of pseudocoelomate evolution: a minor clade (Acanthocephala + Rotifera) defined principally by a syncytial epidermis, intracytoplasmic lamina, and sperms with anterior flagella, and a major clade, defined primarily by a cuticle that is molted.

Deducing the pattern of arthropod phytogeny from mitochondrial DNA rearrangements

THE origins of arthropods and the phylogenetic relationships among their three major living groups (atelocerates, crustaceans and chelicerates) are vigorously contended. To help resolve this, we…

Bilaterians of the Precambrian-Cambrian transition and the annelid-arthropod relationship.

  • J. W. Valentine
  • Environmental Science
    Proceedings of the National Academy of Sciences of the United States of America
  • 1989
TLDR
There is no evidence that Late Proterozoic invertebrates possessed a coelom suited for peristaltic burrowing, therefore, the annelidan body plan had probably not appeared, and it is not implausible, however, that coelomic spaces in the form of ducts or organ sacs were present in segmented segmented forms.

USING DNA SEQUENCES TO UNRAVEL THE CAMBRIAN RADIATION OF THE ANIMAL PHYLA

TLDR
The achievements and controversies between molecular studies are reviewed and compared to corresponding studies based on morphological data, and important methodological considerations that affect the studies of phylum-level relationships are considered.

The early emergence of platyhelminths is contradicted by the agreement between 18S rRNA and Hox genes data.

  • G. Balavoine
  • Biology
    Comptes rendus de l'Academie des sciences. Serie III, Sciences de la vie
  • 1997

Arthropod Phylogeny with Special Reference to Insects

TLDR
Elucidates the major evolutionary pathways of the Phylum Arthropoda, based on the phylogenetic method of Hennig, and focuses on discovering the derived character states that most probably had a common origin in an ancestral state.

18S rRNA data indicate that Aschelminthes are polyphyletic in origin and consist of at least three distinct clades.

TLDR
Analyses of 18S rRNA sequences from six Aschelminth phyla (including four previously unpublished sequences) support polyphyly for the Aschelminthes.

Molecular phylogeny of the animal kingdom.

TLDR
A rapid sequencing method for ribosomal RNA was applied to the resolution of evolutionary relationships among Metazoa, finding that coelomates radiated rapidly into four groups: chordates, echinoderms, arthropods, and eucoelomate protostomes.