Pelagodinium gen. nov and P-beii comb. nov., a Dinoflagellate Symbiont of Planktonic Foraminifera

International audience The taxonomic status of the free-living stage of the dinoflagellate Gymnodinium beii, symbiont of the foraminifer Orbulinauniversa, was reassessed on the basis of detailed morpho-genetic analyses. Electron microscopy observations revealed previously undescribed morphological f...

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Bibliographic Details
Published in:Protist
Main Authors: Siano, Raffaele, Montresor, Marina, Probert, Ian, Not, Fabrice, de Vargas, Colomban
Other Authors: Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Stazione Zoologica Anton Dohrn (SZN), Evolution des Protistes et Ecosystèmes Pélagiques (EPEP), Adaptation et diversité en milieu marin (AD2M), Station biologique de Roscoff Roscoff (SBR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Station biologique de Roscoff Roscoff (SBR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Universite Pierre et Marie Curie (UMPC, France) 09036, ANR 05-BDIV-004, BioMarKs, SYMFORAD, Region Bretagne (France), ASSEMBLE EC 227799
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2010
Subjects:
dinoflagellates
foraminifera
Orbulina universa
Pelagodinium
Suessiales
symbionts
[SDV]Life Sciences [q-bio]
[SDE]Environmental Sciences
Planktonic foraminifera
Online Access:https://hal.science/hal-01258255
https://doi.org/10.1016/j.protis.2010.01.002
Description
Summary:International audience The taxonomic status of the free-living stage of the dinoflagellate Gymnodinium beii, symbiont of the foraminifer Orbulinauniversa, was reassessed on the basis of detailed morpho-genetic analyses. Electron microscopy observations revealed previously undescribed morphological features of the cell that are important for species recognition. The presence of a single elongated apical vesicle (EAV) ornamented with a row of small knobs, absent in species of the genus Gymnodinium, calls into question the current taxonomic position of the symbiont. The presence of a type E extraplastidial eyespot, the arrangement of the amphiesmal vesicles in series and the absence of trichocysts confirm the affiliation with other symbiotic dinoflagellates and certain genetically related non-symbiotic genera, all belonging to the order Suessiales. The arrangement of the series of vesicles of the analyzed strain is unique within the Suessiales, and the ultrastructure of the pyrenoidis different from other symbiotic dinoflagellates. A large subunit (LSU) rDNA phylogenetic analysis confirmed that the analyzed pelagic symbiont clusters in an independent, well-supported clade within the Suessiales with other sequences of symbiotic dinoflagellates extracted from planktonic foraminifera. Hence a novel genus, Pelagodinium gen. nov., is erected for this pelagic, symbiotic dinoflagellate, and Gymnodinium beii is reclassified as Pelagodinium beii. (C) 2010 Elsevier GmbH. All rights reserved.

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