Investigation of phytoplankton from East China Sea of the Pacific Ocean, offshore Réunion Island of the Indian Ocean, and the French Atlantic coast revealed a species of poorly known armored fusiform dinoflagellate. To clarify this species, morphology and phylogeny based on mitochondrial and nuclear protein gene sequence (Cox1, Cob and Hsp90) concatenated with the SSU, ITS region and LSU rDNA sequences were analysed. Epifluorescence and scanning electron microscopy observations revealed that the nucleus of the specimen was elongated, sausage-shaped and located equatorially on the left lateral side of the cell, and that the plate formula is Po, 3′, 1a, 6″, 6C, 8S, 5‴, 1p, 2′‴. These morphological features indicate that the species can be assigned to Centrodinium punctatum. Interestingly, the phylogenetic analyses placed this species within the Alexandrium clade, with Alexandrium affine being its closest relative. This indicates that genus Alexandrium is not monophyletic. The most similar morphological traits between C. punctatum and Alexandrium species were the shape of apical pore plate and the arrangement of the sulcal plates. However, since there are significant morphological differences between C. punctatum and Alexandrium species, further studies are needed to clarify the relation between the morphology and molecular phylogeny of other Centrodinium-related fusiform species.

对太平洋东海，印度洋留尼汪岛近海和法国大西洋沿岸浮游植物的调查显示，一种鲜为人知的甲状梭状甲鞭形甲藻。为了阐明该物种，分析了基于线粒体和核蛋白基因序列（Cox1，Cob和Hsp90）与SSU，ITS区和LSU rDNA序列连接的形态和系统发育。落射荧光和扫描电子显微镜观察表明，标本的核呈细长形，香肠形，并位于细胞的左侧赤道，板式为Po，3'，1a，6”，6C，8S ，5‴，1p，2′‴。这些形态学特征表明该物种可以被分配给点角藻。有趣的是，系统发育分析将该物种置于亚历山大氏进化枝内，亚历山大氏仿射是其最接近的近缘种。这表明亚历山大属不是单系的。点状刺柏和亚历山大蛛种之间最相似的形态特征是顶孔板的形状和沟板的排列。但是，由于点状梭菌和亚历山大菌种之间存在明显的形态学差异，因此需要进一步研究以阐明其他与Centr虫相关的梭形菌种的形态学与分子系统发育之间的关系。