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Morphology and taxonomy of chain-forming species of the genus Cochlodinium (Dinophyceae)
Authors:Kazumi Matsuoka  Mitsunori Iwataki  Hisae Kawami
Institution:aInstitute for East China Sea Research, Nagasaki University; 1551-7 Taira-machi, Nagasaki 851-2213, Japan;bLaboratory, 1-14, Bunkyo-machi, Nagasaki 852-8521, Japan;cGraduate School of Science and Technology, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
Abstract:The morphology of an unarmored chain-forming harmful dinoflagellate Cochlodinium polykrikoides and its similar species such as Cochlodinium catenatum, Cochlodinium fulvescens, and Cochlodinium convolutum was carefully observed, emphasizing the single cell stage for clarifying taxonomically important morphological features. To differentiate C. polykrikoides from C. convolutum, the shape and the position of the nucleus are useful characters. C. polykrikoides also differs from C. fulvescens in being smaller in size, possessing many rod-shaped chloroplasts and having the sulcus running just below the cingulum on the dorsal surface. Careful observation of the ichnotype of C. catenatum suggests that C. catenatum sensu Kofoid and Swezy collected from off La Jolla, CA, USA, is not identical to C. catenatum sensu Okamura and is probably a different species, in having no chloroplasts and a nucleus positioned at the center of the cell. In addition, C. polykrikoides has many morphological features in common with C. catenatum sensu Okamura except for slightly elongate cells and is probably a junior synonym of this species.
Keywords:Cochlodinium polykrikoides  Cochlodinium heterolobatum  Cochlodinium catenatum  Cochlodinium convolutum  Dinoflagellate  Morphology  Taxonomy  HAB
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