Alexandrium ostenfeldii

Super Group: 
(Paulsen) Balech & Tangen 1985
Basionym: Goniodoma ostenfeldii Paulsen 1904.
Goniaulax tamarensis Lebour var. globosa Braarud 1945
Goniaulax ostenfeldii (Paulsen) Paulsen 1949
Heteraulacus ostenfeldii (Paulsen) Loeblich 1970
Gonyaulax globosa (Braarud) Balech 1971
Gonyaulax trygvei Parke 1976
Protogonyaulax globosa (Braarud) Taylor 1979
Gessnerium ostenfeldii (Paulsen) Loeblich and Loeblich 1979
Pyrodinium phoneus Woloszynska and Conrad 1939
Triadinium ostenfeldii (Paulsen) Dodge 1981.


Armoured marine planktonic dinoflagellate. Generally, it is a cold-water coastal species found in low numbers mainly along the West coast of Europe. Cells are large and nearly spherical. Cells are single, but are often found in two-celled colonies. Epitheca and hypotheca equal in height. This species has thin thecal plates and a characteristic large ventral pore on the first apical plate (1'). Faint surface pores are numerous and unevently distributed. Cells range in size between 40-56 µm in length and 40-50 µm in transdiameter width. The plate formula: Po, 4', 6'', 6c, 10s, 5''', 2''''. The apical pore complex (APC) is triangular or rectangular in shape. the apical pore plate (Po) is relatively large with a large comma-shaped foramen. It can be iether in direct contact with the first apical plate (1') or indirectly connected via a thin suture (thread_like process). The most distinctive plate of this species is the 1' ventral pore : it bears a large characteristic ventral pore, and a 90 degree angle is ofrmed at the point where the ventral pore and the 4' plate come in contact. The distinctive sixth precingular plate (6'') is wider than high. The borad epitheca is convex-conical, while the hypotheca is hemispherical with an obliquely flattened antapex. The slightly excavated cingulum is equatorial and displaced in a descending fashion less than one time its width; it has narrow lists. The sulcus is slightly depressed and inconspicuous. The nucleus is U-shaped and equatorial. Producing paralytic shellfish poisoning (PSP) toxins. 


Substrate: planktonic
Sociability: solitary
Salinity: marine
Salinity: variable (estuary)
pH: neutral

Feeding: Photosynthetic

Life cycle

Phases_alternance: haplontic
Generation: <1 month

Reproduction_mode: asexual_binary
Reproduction_mode: sexual_heterothallic (isogamous mating types)
Resting_stage: cysts_sexual
Resting_stage: cysts_asexual

Feeding behaviour


Mode of locomotion

Two flagella typical for Dinophyceae
Flagellum: 2
Motility: motile_swimming

Attached phylogeny

Observation site(s)


Displaying 1 - 5 of 5
Association with... Region origin Name of site In reference...
Parvilucifera infectans Kristineberg Marine Research Station
Parvilucifera infectans Penzé estuary
Parvilucifera infectans Rance estuary
Parvilucifera rostrata Penzé estuary
Parvilucifera sinerae Catalunya Harbor of Arenys de Mar

ASQME static network (beta)

ASQME dynamic network (beta)

ASQME map (beta)