Molecular phylogeny of Sinophysis: Evaluating the possible early evolutionary history of dinophysoid dinoflagellates
Published:January 01, 2013
M. Hoppenrath, N. Chomérat, B. Leander, 2013. "Molecular phylogeny of Sinophysis: Evaluating the possible early evolutionary history of dinophysoid dinoflagellates", Biological and Geological Perspectives of Dinoflagellates, J. M. Lewis, F. Marret, L. R. Bradley
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Dinophysoids are a group of thecate dinoﬂagellates with a very distinctive thecal plate arrangement involving a sagittal suture: the so-called dinophysoid tabulation pattern. Although the number and layout of the thecal plates is highly conserved, the morphological diversity within the group is outstandingly high for dinoﬂagellates. Previous hypotheses about character evolution within dinophysoids based on comparative morphology alone are currently being evaluated by molecular phylogenetic studies. Sinophysis is especially signiﬁcant within the context of these hypotheses because several features within this genus approximate the inferred ancestral states for dinophysoids as a whole, such as a (benthic) sand-dwelling lifestyle, a relatively streamlined theca and a heterotrophic mode of nutrition. We generated and analysed small subunit (SSU) rDNA sequences for ﬁve different species of Sinophysis, including the type species (S. ebriola, S. stenosoma, S. grandis, S. verruculosa and S. microcephala). We also generated SSU rDNA sequences from the planktonic dinophysoid Oxyphysis (O. oxytoxoides). Temperate and tropical species as well as the complete spectrum of thecal ornamentation within Sinophysis was addressed in our study. The sequences from the Sinophysis species formed a robust monophyletic group that was the sister to a robust clade consisting of all other dinophysoid genera, including Oxyphysis, in some analyses. Although the sister relationship received weak statistical support, this tree topology was consistent with inferences based on comparative morphology.
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Biological and Geological Perspectives of Dinoflagellates
This volume provides an overview of current research on fossil and modern dinoflagellates, as well as highlighting research areas for future collaboration, following the DINO9 International Conference in Liverpool. The volume is organized into four themes, with a review paper for each theme written by the key-note speaker. Each theme also includes a future research foci note following discussion during the conference. The contributions are organized into the following sections: environmental change, ecology/palaeoecology, life cycles and diversity, and stratigraphy and evolution. Also included are notes from two workshops: culture experiments and dinocysts as palaeoceanographic tracers. This volume will be of interest to both the biological and Micropalaeontological communities.