A nuclear-encoded small-subunit ribosomal RNA timescale for diatom evolution

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A preliminary multi gene phylogeny of the diatoms (Bacillariophyta): Challenges for future research (2010, background): “2006) and molecular clocks imply the existence of several “ghost lineages” or discrepancies between clock estimates and stratigraphy (Sorhannus 2007).”
Barcoding diatoms: evaluation of the V4 subregion on the 18S rRNA gene, including new primers and protocols (2011, methodology): “…small ribosomal subunit (SSU-rRNA gene), as the latter has been used widely for phylogenetic and taxonomic purposes (e.g. Behnke et al. 2004; Beszteri et al. 2001; Friedl and O’Kelly 2002; Kooistra and Medlin 1996; Medlin et al. 1996; Medlin and Kaczmarska 2004; Sarno et al. 2005; Sorhannus 2007).”
The life of diatoms in the world's oceans (2009, background): “The rise of diatoms Molecular-clock-based estimates suggest that diatoms arose in the Triassic period, perhaps as early as 250 Myr ag”
A comprehensive study of sterols in marine diatoms (Bacillariophyta): Implications for their use as tracers for diatom productivity (2010, background): “Despite their current abundance, it was only relatively recently in geologic history that diatoms occupied their dominant position; molecular clock calculations suggest that diatoms originated during the Early Jurassic (Sorhannus 2007; Rampen et al. 2009b), and this is in accordance with findings of”