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A multi-locus time-calibrated phylogeny of the siphonous green algae
Verbruggen, H.; Ashworth, M.; LoDuca, S. T. ; Vlaeminck, C.; Cocquyt, E.; Sauvage, T.; Zechman, F. W.; Littler, D.S.; Littler, M. M.; Leliaert, F.; De Clerck, O. (2009). A multi-locus time-calibrated phylogeny of the siphonous green algae. Mol. Phylogenet. Evol. 50(3): 642-653. dx.doi.org/10.1016/j.ympev.2008.12.018
In: Molecular Phylogenetics and Evolution. Elsevier: Orlando, FL. ISSN 1055-7903; e-ISSN 1095-9513
Peer reviewed article  

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Author keywords
    Molecular phylogenetics Relaxed molecular clock Fossil algae Bryopsidales Dasycladales Ulvophyceae Chlorophyta

Auteurs  Top 
  • Verbruggen, H.
  • Ashworth, M.
  • LoDuca, S. T.
  • Vlaeminck, C.
  • Cocquyt, E.
  • Sauvage, T.
  • Zechman, F. W.
  • Littler, D.S.
  • Littler, M. M.
  • Leliaert, F.
  • De Clerck, O.

Abstract
    The siphonous green algae are an assemblage of seaweeds that consist of a single giant cell. They comprise two sister orders, the Bryopsidales and Dasycladales. We infer the phylogenetic relationships among the siphonous green algae based on a five-locus data matrix and analyze temporal aspects of their diversification using relaxed molecular clock methods calibrated with the fossil record. The multi-locus approach resolves much of the previous phylogenetic uncertainty, but the radiation of families belonging to the core Halimedineae remains unresolved. In the Bryopsidales, three main clades were inferred, two of which correspond to previously described suborders (Bryopsidineae and Halimedineae) and a third lineage that contains only the limestone-boring genus Ostreobium. Relaxed molecular clock models indicate a Neoproterozoic origin of the siphonous green algae and a Paleozoic diversification of the orders into their families. The inferred node ages are used to resolve conflicting hypotheses about species ages in the tropical marine alga Halimeda.

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