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A new clade, based on partial LSU rDNA sequences, of unarmoured dinoflagellates
journal contribution
posted on 2023-05-19, 04:58 authored by Rene, A, Miguel de SalasMiguel de Salas, camp, J, Balague, V, Garces, EThe 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.
History
Publication title
ProtistVolume
164Issue
5Pagination
673-685ISSN
1434-4610Department/School
School of Natural SciencesPublisher
Urban & Fischer VerlagPlace of publication
Branch Office Jena, P O Box 100537, Jena, Germany, D-07705Rights statement
© 2013 Elsevier GmbHRepository Status
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