Morphology, phylogeny and azaspiracid profile of Azadinium poporum (Dinophyceae) from the China Sea

► We reported two distinct ribotypes of Azadinium poporum in China Sea. ► The European ribotype is different from the new ones reported here. ► Azaspiracid profiles of Chinese A. poporum turned out to be diverse. ► A novel Azaspiracid with a molecular mass of 871 Da was detected.