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

Anna Marie A. Aguinaldo, James M. Turbeville, Lawrence S. Linford, Maria C. Rivera, James R. Garey, Rudolf A. Raff and James A. Lake
Additional contact information
Anna Marie A. Aguinaldo: University of California
James M. Turbeville: University of Arkansas
Lawrence S. Linford: University of California
Maria C. Rivera: University of California
James R. Garey: Duquesne University
Rudolf A. Raff: Indiana University
James A. Lake: University of California

Nature, 1997, vol. 387, issue 6632, 489-493

Abstract: Abstract 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 arthropods in morphological and mitochondrial DNA sequence analyses4,5. Like annelids, they possess segmental nephridia and muscles that are a combination of smooth and obliquely striated fibres6. Our phylogenetic analysis of 18S ribosomal DNA sequences indicates a close relationship between arthropods, nematodes and all other moulting phyla. The results suggest that ecdysis (moulting) arose once and support the idea of a new clade, Ecdysozoa, containing moulting animals: arthropods, tardigrades, onychophorans, nematodes, nematomorphs, kinor-hynchs and priapulids. No support is found for a clade of segmented animals, the Articulata, uniting annelids with arthropods. The hypothesis that nematodes are related to arthropods has important implications for developmental genetic studies using as model systems the nematode Caenorhabditis elegans and the arthropod Drosophila melanogaster, which are generally held to be phylogenetically distant from each other.

Date: 1997
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DOI: 10.1038/387489a0

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