Abstract
SYNOPSIS. Our interpretation of the evolution of development, morphology, and diversity of multicellular animals hinges on a clear understanding of the phylo- genetic relationships of metazoans. Currently, the field of metazoan phylogeny is in a state of flux, with new hypotheses of metazoan relationships emerging from analyses of 18S rDNA sequence data. Some of these analyses have been limited in the numbers of taxa analyzed, others, with numerous taxa analyzed, have not resolved deep level branching patterns, and all are hampered by properties of the 18S gene itself. Corroboration of the results from 18S rDNA analyses can come from additional molecular data sets, such as highly conserved nuclear coding genes, mitochondria! gene order, or gene duplication events. The enormous task of data accumulation for additional molecular data from many representative taxa can most efficiently be undertaken in a coordinated, collaborative effort among differ- ent lab groups. Ultimately, a combined analysis of several independent data sets will be possible and may provide a more stable, robust phylogeny for the Metazoa.
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