FN Archimer Export Format
PT J
TI Redefinition of the Dinoflagellate Genus     Alexandrium     Based on     Centrodinium     : Reinstatement of     Gessnerium     and     Protogonyaulax     , and     Episemicolon     gen. nov. (Gonyaulacales, Dinophyceae)
BT 
AF Gómez, Fernando
   Artigas, Luis Felipe
AS 1:1,2;2:2;
FF 1:;2:;
C1 Carmen Campos Panisse 3, E-11500 Puerto de Santa María, Spain
   Université du Littoral Côte d’Opale, Université de Lille, CNRS, UMR 8187, LOG, Laboratoire d’Océanologie et de Géosciences, 32 Av. Foch 62930, Wimereux, France
C2 Carmen Campos Panisse 3, E-11500 Puerto de Santa María, Spain
   UNIV LITTORAL COTE D'OPALE, FRANCE
TC 0
UR https://archimer.ifremer.fr/doc/00599/71128/69443.pdf
LA English
DT Article
CR ETOILE
BO Côtes De La Manche
AB The genus Centrodinium contains oceanic and predominantly tropical species that have received little attention. Three species of Centrodinium were examined using thecal plate dissociation, scanning electron microscopy, and molecular sequences. The apical horn of Centrodinium intermedium and C. eminens is formed by the elongation of the fourth apical plate, and a second apical split into two plates. In C. punctatum two apical plates (2′ and 4′) almost completely encircle the apical pore plate (Po), while the contact with the plate 1′ in the ventral side is much reduced, and the plate 3′ does not reach the Po. Moreover, its left posterior lateral sulcal plate is longer than its right pair, while reversed in the typical Centrodinium spp. The sulcal posterior plate of C. punctatum is located in the left-ventral side below the plates 1′′′ and 2′′′, while the sulcal posterior plate located in the right face below the plates 4′′′ and 5′′′ in the typical Centrodinium spp. Phylogenetic analyses based on the small and large subunit of the rRNA gene showed that Centrodinium spp. and Alexandrium affine/A. gaarderae clustered as a sister clade of the Alexandrium tamarense/catenella/fraterculus groups. The clade of the subgenus Gessnerium, and the clade of the type species of Alexandrium, A. minutum, with four divergent species, clustered in more basal positions. The polyphyly of Alexandrium is solved with the split into four genera: (1) Alexandrium sensu stricto for the species of the clade of A. minutum and four divergent species; (2) the reinstatement of the genus Gessnerium for the species of the clade of A. monilatum; (3) the reinstatement of genus Protogonyaulax for the species of the tamarense/catenella/fraterculus groups, and (4) the new genus Episemicolon gen. nov. for A. affine and A. gaarderae. New combinations in the genera Gessnerium, Protogonyaulax, and Episemicolon are proposed. 
PY 2019
PD DEC
SO Journal of Marine Biology
SN 1687-9481
PU Hindawi Limited
VL 2019
IS 1284104
BP 1
EP 17
DI 10.1155/2019/1284104
ID 71128
ER

EF