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        A novel phylogeny of the Gelidiales (Rhodophyta) based on five genes including the nuclear <i>Ces</i>A, with descriptions of <i>Orthogonacladia</i> gen. nov. and Orthogonacladiaceae fam. nov.

        Boo, Ga Hun,Le Gall, Line,Miller, Kathy Ann,Freshwater, D. Wilson,Wernberg, Thomas,Terada, Ryuta,Yoon, Kyung Ju,Boo, Sung Min Academic Press 2016 Molecular phylogenetics and evolution Vol.101 No.-

        <P><B>Abstract</B></P> <P>Although the Gelidiales are economically important marine red algae producing agar and agarose, the phylogeny of this order remains poorly resolved. The present study provides a molecular phylogeny based on a novel marker, nuclear-encoded <I>Ces</I>A, plus plastid-encoded <I>psa</I>A, <I>psb</I>A, <I>rbc</I>L, and mitochondria-encoded <I>cox</I>1 from subsets of 107 species from all ten genera within the Gelidiales. Analyses of individual and combined datasets support the monophyly of three currently recognized families, and reveal a new clade. On the basis of these results, the new family Orthogonacladiaceae is described to accommodate <I>Aphanta</I> and a new genus <I>Orthogonacladia</I> that includes species previously classified as <I>Gelidium madagascariense</I> and <I>Pterocladia rectangularis</I>. <I>Acanthopeltis</I> is merged with <I>Gelidium</I>, which has nomenclatural priority. Nuclear-encoded <I>Ces</I>A was found to be useful for improving the resolution of phylogenetic relationships within the Gelidiales and is likely to be valuable for the inference of phylogenetic relationship among other red algal taxa.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A comprehensive molecular phylogeny of 107 species in ten genera of the Gelidiales is provided for the first time. </LI> <LI> Nuclear <I>Ces</I>A is an informative molecular marker for the phylogeny of the Gelidiales. </LI> <LI> Multi-gene phylogenies (including 5 markers) improve resolution of phylogenetic relationships in the Gelidiales. </LI> <LI> A new genus and a new family are described: <I>Orthogonacladia</I> gen. nov. and Orthogonacladiaceae fam. nov. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

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