Molecular Biology and Evolution, Vol 14, 902-913, Copyright © 1997 by Society for Molecular Biology and Evolution
JC Regier and JW Shultz
A phylogeny of the arthropods was inferred from analyses of amino acid
sequences derived from the nuclear genes encoding elongation factor-1 alpha
and the largest subunit of RNA polymerase II using maximum- parsimony,
neighbor-joining, and maximum-likelihood methods. Analyses of elongation
factor-1 alpha from 17 arthropods and 4 outgroup taxa recovered many
arthropod clades supported by previous morphological studies, including
Diplopoda, Myriapoda, Insecta, Hexapoda, Branchiopoda (Crustacea), Araneae,
Tetrapulmonata, Arachnida, Chelicerata, and Malacostraca (Crustacea).
However, counter to previous studies, elongation factor-1 alpha placed
Malacostraca as sister group to the other arthropods. Branchiopod
crustaceans were found to be more closely related to hexapods and myriapods
than to malacostracan crustaceans. Sequences for RNA polymerase II were
obtained from 11 arthropod taxa and were analyzed separately and in
combination with elongation factor-1 alpha. Results from these analyses
were concordant with those derived from elongation factor-1 alpha alone and
provided support for a Hexapoda/Branchiopoda clade, thus arguing against
the monophyly of the traditionally defined Atelocerata (Hexapoda +
Myriapoda).
ORIGINAL ARTICLE
Molecular phylogeny of the major arthropod groups indicates polyphyly of crustaceans and a new hypothesis for the origin of hexapods
Center for Agricultural Biotechnology, University of Maryland Biotechnology Institute, College park, USA. regier@glue.umd.edu
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