Alexandrium tamarense (Lebour) Balech 1992

A = Cell with nucleus; B =1'-plate with ventral pore (=arrow); C = Sulcus and part of cingulum; D=Sulcus with fins; E =1' with pore and apical pore complex with pore (comma) and connecting pore (=arrowhead); F=A living cyst (BF) (courtesy of Anna Godhe). A-D = Living cells.(DIC)

Synonym(s): Gonyaulax tamarensis Lebour 1925 , G. excavata (Braarud) Balech 1971 Protogonyaulax tamarensis (Lebour) F. J. R. Taylor 1979

Life-form: Solitary or in pairs

Size: Length 25-46 µm.

Resting spore: +

Note: Can be confused with other Alexandrium spp. and Fragilidium spp. Toxic and non toxic strains

Distinctive features: 1'-plate with small ventral pore, apical pore complex

Similar species:

Distribution: Widely

Balech, E. & Tangen, K. 1985. Morphology and taxonomy of toxic species in the Tamarensis group (Dinophyceae): Alexandrium excavatum (Braarud) comb. nov. and Alexandrium ostenfeldii (Paulsen) comb. nov. Sarsia. 70: 333-343.

Dale, B.1977b. Cysts of the toxic red-tide dinoflagellate Gonyaulax excavata (Braarud) Balech from Oslofjorden, Norway. Sarsia. 63: 29-34.

Steidinger, K. A. & Tangen, K. 1996. Dinoflagellates. In: Tomas, C. R. (ed.) Identifying marine diatoms and dinoflagellates. Academic Press, Inc., San Diego, p. 387-584.

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Last modified on 15 September, 2006

Swedish Meteorological and Hydrological Institute

Department of Marine Ecology, Göteborg University, Sweden