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Perspectives in Animal Phylogeny and Evolution$
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Alessandro Minelli

Print publication date: 2008

Print ISBN-13: 9780198566205

Published to Oxford Scholarship Online: May 2009

DOI: 10.1093/acprof:oso/9780198566205.001.0001

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A gallery of the major bilaterian clades

A gallery of the major bilaterian clades

(p.71) Chapter 6 A gallery of the major bilaterian clades
Perspectives in Animal Phylogeny and Evolution

Alessandro Minelli

Oxford University Press

Current perspectives on the phylogeny of the major lineages of bilaterian animals are reviewed. Molecular phylogenetics suggests that the Acoela represent the most basally branching group of living Bilateria. The still poorly circumscribed Annelida have been found to include the Pogonophora, the Echiura, and, tentatively, the Sipuncula. The Acanthocephala have emerged as modified Rotifera, with which they are now grouped as the Syndermata. The Phoronidea have been shown to derive from within the Brachiopoda, thus requiring be grouped with the latter in the monophyletic taxon Phoronozoa. The hexapods form a clade (Tetraconata) together with the crustaceans, to the exclusion of the myriapods, which possibly branch together with the chelicerates (Myriochelata). Still very problematic, but firmly within the protostomes, is the position of the Chaetognatha, whereas the Xenoturbellida, previously regarded as flatworms or molluscs, are now recognized as members of the deuterostomes.

Keywords:   Acoela, Annelida, Arthropoda, Chaetognatha, Myriochelata, Phoronozoa, Syndermata, Tetraconata, Xenoturbellida

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