Mitochondrial Genes Collectively Suggest the Paraphyly of Crustacea with Respect to Insecta |
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| Authors: | Erik García-Machado Malgorzata Pempera Nicole Dennebouy Mario Oliva-Suarez Jean-Claude Mounolou Monique Monnerot |
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| Institution: | (1) Centro de Investigaciones Marinas, Universidad de La Habana, Calle 1ra No. 2808, esquina 30, Miramar, C. Habana, Cuba, CU;(2) Centre de Génétique Moléculaire, CNRS, 91198 Gif-sur-Yvette Cedex, France, FR |
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| Abstract: | Complete sequences of seven protein coding genes from Penaeus notialis mitochondrial DNA were compared in base composition and codon usage with homologous genes from Artemia franciscana and four insects. The crustacean genes are significantly less A + T-rich than their counterpart in insects and the pattern
of codon usage (ratio of G + C-rich versus A + T-rich codon) is less biased. A phylogenetic analysis using amino acid sequences
of the seven corresponding polypeptides supports a sister-taxon status for mollusks–annelid and arthropods. Furthermore, a
distance matrix-based tree and two most-parsimonious trees both suggest that crustaceans are paraphyletic with respect to
insects. This is also supported by the inclusion of Panulirus argus COII (complete) and COI and COIII (partial) sequence data. From analysis of single and combined genes to infer phylogenies,
it is observed that obtained from single genes are not well supported in most topologies cases and notably differ from that
of the tree based on all seven genes.
Received: 25 August 1998 / Accepted: 8 March 1999 |
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| Keywords: | : mtDNA — Protein genes — Panulirus argus— Penaeus notialis— Protostomes — Crustacea — Phylogeny |
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