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Title

A New Clade, Based on Partial LSU rDNA Sequences, of Unarmoured Dinoflagellates

AuthorsReñé, Albert ; Salas, Miguel de; Camp, Jordi ; Balagué, Vanessa ; Garcés, Esther
KeywordsAcrobase
Ceratoperidinium
Gymnodiniales
LSU rDNA
Phylogeny
Unarmoured
LSU
rDNA
Issue DateSep-2013
PublisherElsevier
CitationProtist 164(5): 673-685 (2013)
AbstractThe 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) Reñé & 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
Description14 páginas, 5 figuras, 1 tabla
Publisher version (URL)http://dx.doi.org/10.1016/j.protis.2013.07.002
URIhttp://hdl.handle.net/10261/83104
DOI10.1016/j.protis.2013.07.002
ISSN1434-4610
E-ISSN1618-0941
Appears in Collections:(ICM) Artículos
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