02273nas a2200265   4500008004100000245015900041210006900200260001200269300001200281490000700293520144500300653002001745653001301765653002401778653001601802653001701818653000801835653001301843653001301856100002201869700002301891700002201914700002201936856004901958       2010                        eng d00aMorphology and molecular phylogeny of Prorocentrum consutum sp. nov. (Dinophyceae), a new benthic dinoflagellate from South Brittany (Northwestern France)0 aMorphology and molecular phylogeny of Prorocentrum consutum sp n  c02/2010  a183-1940 v463 aA new marine benthic Prorocentrum species from sandy habitats of South Brittany (northwestern France), P. consutum sp. nov., is described using LM and SEM and molecular phylogenetic analyses. Cells have a subcircular to broadly ovoid shape and are plainly flattened. They are 57-61 microns long and 52-55 microns wide. A central pyrenoid is present, and the kidney-shaped nucleus is positioned in the posterior region. In right valve view, the periflagellar area is deeply excavated, and the left valve forms a proinent apical ridge. The periflagellar area consists of nine platelets, and a small narrow collar is present around the flagellar pore. The ornamentation of this new species is very peculiar and is characterized by a ring of round areolae located at the peripherhy of the valves, each areola containing three or four pores. Apart from this ring of areolae, the cell surface is smooth and with scattered pores. Pores are not present in the center of the right or left valve. The intercalary band is generally narrow and faintly striated horizontally. The molecular phylogenetic position of P. consutum sp. nov. was inferred using SSU and LSU rDNA. In both analyses, this species branched with high support in the clade comprising species with a symmetric shape and appeared to be a sister group to that formed by P. lima and other tropical benthic species, such as P. arenarium, P. belizeanum, P. hoffmannianum and P. maculosum.10adinoflagellates10aLSU rDNA10amolecular phylogeny10anuclear DNA10aProrocentrum10aSEM10aSSU rDNA10ataxonomy1 aChomerat, Nicolas1 aSellos, Daniel, Y.1 aZentz, Frédéric1 aNézan, Elisabeth  uhttps://dinoflagellate.myspecies.info/node/6