Pelagodinium béii

Super Group: 
Siano, Montresor,Probert et deVargas 2010
Gymnodinium beii, Spero (1987)


Diagnosis_Genus: Siano, Montresor, Probert et de Vargas.Cellulae photosynteticae ad Dino- phita pertinentes. Cellulae in libera vita octo seriebus vesicularum amphiesmatis contectae. Quattor in epicono, tres in hypocono, una in cingulo. Longa recta vesicula linea recta tuberum globosorum constituta in cellulae apice. Series parvarum vesicularum quadriangularum vel pen- tagonarum sub cingulo proxime est et hypoconum circumdat. Chloroplasti colore flavente cum pyr- enoidis adherentibus. Pyrenoidi thylachoidorum lamellis invasi. Stigma extra plastidium ad typum E pertinens. Trichocisti absunt. Photosynthetic dinoflagellate. Free-living cells covered by eight series of amphiesmal vesicles: four in the epicone, three in the hypocone, and one in the cingulum. A straight single elongated apical vesicle constituted of a single row of globular knobs is present on the cell apex. A series of small quadrangular or pentagonal vesi- cles is present immediately below the cingulum and encircles the hypocone. Chloroplasts golden- yellow in colour, with stalked pyrenoids. Pyrenoids penetrated by thylakoid lamellae. Extraplastidial eyespot present belonging to type E. Trichocysts absent.

Diagnosis_Species:Siano, Montresor, Probert et de Vargas. Cells are small: 10.0 ±0.8 µm in length, 6.6±0.4 µm in width,with around to elliptical epicone and a slightly asymmetrical hypocone of almost the same dimensions. A flange is present on the left side of the epicone, projecting over the sulcus, it can be short and rounded to more pointed and elongated. Cingulum wide and shallow, descending and displace done cingulum width. Sulcus deep and narrow, enlarging only at cell antapex. Flagella emerging from the sulcal region, no peduncleis evident. When cells are observed in SEM, amphiesmal vesicles are visible on the cell surface, arranged in 8 longitudinal series. A single elongated apical vesicle(EAV) ornamented with a row of globular knobs is present on the cell surface, surrounded by a series of 3 quadrangular vesicles and a smalls quared vesicle (Xvesicle). Another3 series of vesicles are present in the epicone constituted respectively of 7,2-3 (intercalary), and 8 vesicles. Cingulum with one series of vesicles. Hypocone with a series of 16-20 small vesicles, anterior to an other series of 8 vesicles and 3-4 antapicals. One or two peripheral golden-yellow chloroplasts, with one or two stalked pyrenoids. Pyrenoids are penetrated by thylakoid lamellae. An extraplastidial eyespot of type E is present near the flagellar roots. Trichocysts absent

Body_length: 10.0 ± 0.8 µm
Body_wide: 6.6 ± 0.4 µm

Sequence_COI: JN557915
Sequence_COII: JN557941


name Pelagodinium = the genus name derives from the life strategy of this dinoflagellate:dinoflagellate (=dinos) symbiont of pelagic(=pelagos) protists. (Siano et al, 2010)

Type species

This is the type species of the genus.


Substrate: planktonic
Salinity: marine

Life cycle

Generation: <1 month
Reproduction_mode: asexual
Symbiont: horizontal

Feeding behaviour


Mode of locomotion

Two flagella typical for Dinophyceae

Attached phylogeny

Observation site(s)


Displaying 1 - 7 of 7
Association with... Region origin Name of site In reference...
Globigerinoides conglobata
Globigerinoides ruber
Globigerinoides sacculifer
Orbulina universa Santa catalina island
Orbulina universa Puerto Rico
Orbulina universa California current
Acanthochiasma sp. Villefranche Bay Villefranche-sur-mer