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A new clade, based on partial LSU rDNA sequences, of unarmoured dinoflagellates


Rene, A and de Salas, MF and camp, J and Balague, V and Garces, E, A new clade, based on partial LSU rDNA sequences, of unarmoured dinoflagellates, Protist, 164, (5) pp. 673-685. ISSN 1434-4610 (2013) [Refereed Article]

Copyright Statement

2013 Elsevier GmbH

DOI: doi:10.1016/j.protis.2013.07.002


The order Gymnodiniales comprises unarmoured dinoflagellates. However, the lack of sequences hindered determining the phylogenetic positions and systematic relationships of several gymnodinioid taxa. In this study, a monophyletic clade was defined for the species Ceratoperidinium margalefii Loeblich III, Gyrodinium falcatum Kofoid & Swezy, three Cochlodinium species, and two Gymnodinium-like dinoflagellates. Despite their substantial morphotypic differentiation, Cochlodinium cf. helix, G. falcatum and Gymnodinium sp. 1 share a common shape of the acrobase. The phylogenetic data led to the following conclusions: (1) C. margalefii is closely related to several unarmoured dinoflagellates. Its sulcus shape has been observed for the first time. (2) G. falcatum was erroneously assigned to the genus Gyrodinium and is transferred to Ceratoperidinium (C. falcatum (Kofoid & Swezy) Re & de Salas comb. nov.). (3) The genus Cochlodinium is polyphyletic and thus artificial; our data support its separation into three different genera. (4) The two Gymnodinium-like species could not be morphologically or phylogenetically related to any other gymnodinioid species sequenced to date. While not all studied species have been definitively transferred to the correct genus, our study is a step forward in the classification of inconspicuous unarmoured dinoflagellates. The family Ceratoperidiniaeceae and the genus Ceratoperidinium are emended.

Item Details

Item Type:Refereed Article
Keywords:acrobase, Ceratoperidinium, Gymnodiniales, LSU rDNA, phylogeny, unarmoured dinoflagellates
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Phycology (incl. marine grasses)
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Biodiversity in Antarctic and Southern Ocean environments
UTAS Author:de Salas, MF (Dr Miguel de Salas)
ID Code:116748
Year Published:2013
Web of Science® Times Cited:19
Deposited By:Plant Science
Deposited On:2017-05-18
Last Modified:2017-11-06

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