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Arthropod phylogeny based on eight molecular loci and morphologyThe interrelationships of major clades within the Arthropoda remain one of the most contentious issues in systematics, which has traditionally been the domain of morphologists. A growing body of DNA sequences and other types of molecular data has revitalized study of arthropod phylogeny and has inspired new considerations of character evolution. Novel hypotheses such as a crustacean-hexapod affinity were based on analyses of single or few genes and limited taxon sampling, but have received recent support from mitochondrial gene order, and eye and brain ultrastructure and neurogenesis. Here we assess relationships within Arthropoda based on a synthesis of all well sampled molecular loci together with a comprehensive data set of morphological, developmental, ultrastructural and gene-order characters. The molecular data include sequences of three nuclear ribosomal genes, three nuclear protein-coding genes, and two mitochondrial genes (one protein coding, one ribosomal). We devised new optimization procedures and constructed a parallel computer cluster with 256 central processing units to analyse molecular data on a scale not previously possible. The optimal 'total evidence' cladogram supports the crustacean-hexapod clade, recognizes pycnogonids as sister to other euarthropods, and indicates monophyly of Myriapoda and Mandibulata.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Giribet, G. (Harvard University 16 Divinity Avenue, Cambridge, Massachusetts 02138, United States)
Edgecombe, G. D.
Wheeler, W. C.
Date Acquired
August 21, 2013
Publication Date
September 13, 2001
Publication Information
Publication: Nature
Volume: 413
Issue: 6852
ISSN: 0028-0836
Subject Category
Life Sciences (General)
Distribution Limits
Non-NASA Center
NASA Discipline Evolutionary Biology