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A time-calibrated multi-gene phylogeny of the diatom genus Pinnularia

Authors
Publisher
Elsevier Inc.
Volume
61
Issue
3
Identifiers
DOI: 10.1016/j.ympev.2011.08.031
Keywords
  • Molecular Phylogenetics
  • Relaxed Molecular Clock
  • Fossil Record
  • Raphid Diatoms
  • Pinnularia
  • Bacillariophyceae
  • Eocene
Disciplines
  • Ecology

Abstract

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 Pinnularia–Caloneis complex is estimated to have diverged between the Upper Cretaceous and the early Eocene, implying a ghost range of at least 10million year (Ma) in the fossil record.

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