Arthropod and annelid relationships re-examined

  • D. J. Eernisse
Part of the The Systematics Association Special Volume Series book series (SASS, volume 55)

Abstract

The prevailing view of two centuries recognizes annelid worms as the sister taxon of arthropods. However, recent studies have suggested that there are other animal groups nearer to annelids; under this view arthropods do not belong to the clade, Eutrochozoa Ghiselin, 1988, comprising annelids, molluscs, and several other protostome phyla. This recent work is based on both morphology (Eernisse et al., 1992; Schram and Ellis, 1995) and molecular sequence comparisons; the latter is based on several gene regions, including 18S rRNA (Field et al., 1988; Ghiselin, 1988; Patterson, 1989; Lake, 1990; Turbeville et al., 1991; Ruitort et al., 1993; Valentine, 1994; Halanych et al., 1995; Winnepenninckx et al., 1995a,b; Giribet et al., 1996), mitochondrial 12S rRNA (Ballard et al., 1992), and the two largest subunits of RNA polymerase II (Sidow and Thomas, 1994). However, Rouse and Fauchald (1995) continued to find support for the conventional grouping of annelids and arthropods as sister taxa, termed Articulata Cuvier, 1817, in their cladistic analysis based on 13 morphological characters.

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© Springer Science+Business Media Dordrecht 1998

Authors and Affiliations

  • D. J. Eernisse
    • 1
  1. 1.Department of Biology MH282California State UniversityFullertonUSA

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