Title
A time-calibrated multi-gene phylogeny of the diatom genus **Pinnularia** A time-calibrated multi-gene phylogeny of the diatom genus **Pinnularia**
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Orlando, Fla ,
Subject
Biology
Source (journal)
Molecular phylogenetics and evolution. - Orlando, Fla
Volume/pages
61(2011) :3 , p. 866-879
ISSN
1055-7903
ISI
000297387600024
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
Pinnularia is an ecologically important and species-rich genus of freshwater diatoms (Bacillariophyceae) showing considerable variation in frustule morphology. Interspecific evolutionary relationships were inferred for 36 Pinnularia taxa using a five-locus dataset. A range of fossil taxa, including newly discovered Middle Eocene forms of Pinnularia, was used to calibrate a relaxed molecular clock analysis and investigate temporal aspects of the genus diversification. The multi-gene approach resulted in a well-resolved phylogeny of three major clades and several subclades that were frequently, but not universally, delimited by valve morphology. The genus Caloneis was not recovered as monophyletic, confirming that, as currently delimited, this genus is not evolutionarily meaningful and should be merged with Pinnularia. The PinnulariaCaloneis complex is estimated to have diverged between the Upper Cretaceous and the early Eocene, implying a ghost range of at least 10 million year (Ma) in the fossil record.
E-info
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