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Estimation of divergence times in cnidarian evolution based on mitochondrial protein-coding genes and the fossil record

Title
Estimation of divergence times in cnidarian evolution based on mitochondrial protein-coding genes and the fossil record
Authors
Park E.Hwang D.-S.Lee J.-S.Song J.-I.Seo T.-K.Won Y.-J.
Ewha Authors
송준임원용진
SCOPUS Author ID
송준임scopus; 원용진scopus
Issue Date
2012
Journal Title
Molecular Phylogenetics and Evolution
ISSN
1055-7903JCR Link
Citation
vol. 62, no. 1, pp. 329 - 345
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The phylum Cnidaria is comprised of remarkably diverse and ecologically significant taxa, such as the reef-forming corals, and occupies a basal position in metazoan evolution. The origin of this phylum and the most recent common ancestors (MRCAs) of its modern classes remain mostly unknown, although scattered fossil evidence provides some insights on this topic. Here, we investigate the molecular divergence times of the major taxonomic groups of Cnidaria (27 Hexacorallia, 16 Octocorallia, and 5 Medusozoa) on the basis of mitochondrial DNA sequences of 13 protein-coding genes. For this analysis, the complete mitochondrial genomes of seven octocoral and two scyphozoan species were newly sequenced and combined with all available mitogenomic data from GenBank. Five reliable fossil dates were used to calibrate the Bayesian estimates of divergence times. The molecular evidence suggests that cnidarians originated 741 million years ago (Ma) (95% credible region of 686-819), and the major taxa diversified prior to the Cambrian (543. Ma). The Octocorallia and Scleractinia may have originated from radiations of survivors of the Permian-Triassic mass extinction, which matches their fossil record well. © 2011 Elsevier Inc.
DOI
10.1016/j.ympev.2011.10.008
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자연과학대학 > 생명과학전공 > Journal papers
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