Molecular Phylogeny and Biogeography of the Genus Pseudomma (Peracarida: Mysida)

Molecular Phylogeny and Biogeography of the Genus Pseudomma (Peracarida: Mysida) We used DNA sequences from 18S rDNA (808 bp) and COI mtDNA (599 bp) to infer evolutionary history of northern groups of the deep-sea mysid genus Pseudomma . The V4–V7 regions of 18S show an average of 1.31% sequence divergence between species. A secondary structure model is constructed and used in phylogenetic analyses to allow for different evolutionary rates in paired and unpaired nucleotide partitions. COI is observed as highly variable with uncorrected p-distance averaging 33%. Phylogenies for these sequences were estimated by maximum-likelihood, Bayesian, and maximum-parsimony analyses. More or less similar tree topologies were obtained for each gene with these methods. Pseudomma longisquamosum was placed in a basal clade, using Parapseudomma and Amblyops as outgroups, but the exact relationship of other basal taxa is less clear when results from the two genes are compared. An ancient presence of Pseudomma in the Tethys Sea is suggested by phylogenetic structure, molecular clock considerations, and present distributions. A well-supported Atlantic clade may have diverged from Indo-Pacific groups in the Miocene because of the closure of the Gibraltar Strait. More recent speciation events are proposed in the Norwegian Sea, and an Arctic intrusion from the North Pacific across the Bering Strait is suggested for the circumpolar species Pseudomma truncatum . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Crustacean Biology Brill

Molecular Phylogeny and Biogeography of the Genus Pseudomma (Peracarida: Mysida)

Journal of Crustacean Biology, Volume 24 (4): 541 – Dec 1, 2004

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Copyright
The Crustacean Society
Subject
CONTENTS
ISSN
0278-0372
eISSN
1937-240X
D.O.I.
10.1651/C-2481
Publisher site
See Article on Publisher Site

Abstract

We used DNA sequences from 18S rDNA (808 bp) and COI mtDNA (599 bp) to infer evolutionary history of northern groups of the deep-sea mysid genus Pseudomma . The V4–V7 regions of 18S show an average of 1.31% sequence divergence between species. A secondary structure model is constructed and used in phylogenetic analyses to allow for different evolutionary rates in paired and unpaired nucleotide partitions. COI is observed as highly variable with uncorrected p-distance averaging 33%. Phylogenies for these sequences were estimated by maximum-likelihood, Bayesian, and maximum-parsimony analyses. More or less similar tree topologies were obtained for each gene with these methods. Pseudomma longisquamosum was placed in a basal clade, using Parapseudomma and Amblyops as outgroups, but the exact relationship of other basal taxa is less clear when results from the two genes are compared. An ancient presence of Pseudomma in the Tethys Sea is suggested by phylogenetic structure, molecular clock considerations, and present distributions. A well-supported Atlantic clade may have diverged from Indo-Pacific groups in the Miocene because of the closure of the Gibraltar Strait. More recent speciation events are proposed in the Norwegian Sea, and an Arctic intrusion from the North Pacific across the Bering Strait is suggested for the circumpolar species Pseudomma truncatum .

Journal

Journal of Crustacean BiologyBrill

Published: Dec 1, 2004

References

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