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Mol Phylogenet Evol ; 57(2): 918-23, 2010 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-20817109

RESUMO

This is the first report of the mitochondrial gene order and almost-complete DNA sequence of a representative of the Neritimorpha, the highest-ranking gastropod clade lacking such data. Mitochondrial gene order in Nerita is largely plesiomorphic. Its only difference from the cephalopod Octopus vulgaris is a tRNA transposition shared by Vetigastropoda and Caenogastropoda. Genome arrangements were not informative enough to resolve the evolutionary relationships of Neritimorpha, Vetigastropoda and Caenogastropoda. The sister-group taxon of Neritimorpha varied in sequence-based analyses. Some suggested that Neritimorpha is the sister group of Caenogastropoda plus Heterobranchia and some that Neritimorpha and Caenogastropoda are sister groups. No analysis significantly supported the hypothesis that Vetigastroda is more closely related to Caenogastropoda than is Neritimorpha.


Assuntos
Gastrópodes/classificação , Gastrópodes/genética , Genoma Mitocondrial/genética , Filogenia , Animais , Evolução Molecular , RNA de Transferência/genética
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