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Reanalysis of the Relationships among the Cirripedia and the Ascothoracida and the Phylogenetic Position of the Facetotecta (Maxillopoda: Thecostraca) Using 18S rDNA Sequences

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Abstract Until now morphological and molecular datasets have failed to agree on phylogenetic relationships within the Crustacea Thecostraca (=Facetotecta, Ascothoracida, and Cirripedia). Three recent phylogenetic studies using 18S ribosomal DNA sequences from selected Cirripedia (Thoracica, Rhizocephala, and Acrothoracica) and Ascothoracida revealed Acrothoracica and Ascothoracida as a monophyletic group. This result disagrees with several larval and spermal morphological features supporting Cirripedia as a monophyletic group. We reanalyzed the same molecular data set including a new Facetotecta sequence using neighbor-joining and maximum likelihood, but incorporating the model of evolution that fits the data best, and maximum parsimony approaches. Our results strongly support the morphological hypothesis that the cirripedes form a monophyletic group, with the Acrothoracica as sister group to the Thoracica + Rhizocephala. Moreover, all the phylogenies showed the Facetotecta as the sister group to the remaining Thecostraca (Ascothoracida + Cirripedia).

Affiliations: 1: a (MP-L, correspondence) Department of Integrative Biology, Brigham Young University, Provo, Utah 84602-5255, U.S.A. ( ; 2: b (JTH) Department of Zoomorphology, Zoological Institute, University of Copenhagen, Universitetsparken 15, DK-2100, Copenhagen, Denmark ( ; 3: c (GAK) Department of Invertebrate Zoology, The White Sea Biological Station, Biological Faculty, Moscow State University, Moscow 119899, Russia ( ; 4: d (KAC) Department of Integrative Biology and Monte L. Bean Museum, Brigham Young University, Provo, Utah 84602-5255, U.S.A. (


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