Phylogenetic analysis on a strain of Alexandrium tamarense collected from Antarctic Ocean

► A toxic A. tamarense strain was isolated from the Antarctic Ocean. ► 28S rDNA and ITS sequences of the strain were reported. ► The stain is growing fast (0.37 day−1) with max cell density of 23,000 cell/ml. ► Phylogenetic analysis shown that the strain was fell within in Group IV ribotypes. ► The strain was most closely affiliated to Alexandrium isolates from the China Sea.