Neoceratium gen. nov., a New Genus for All Marine Species Currently Assigned to Ceratium (Dinophyceae)
Neoceratium gen. nov., a New Genus for All Marine Species Currently Assigned to Ceratium (Dinophyceae)
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DOI：
10.1016/j.protis.2009.06.004
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发表时间：
2010-01-01
期刊：
影响因子：
2.5
通讯作者：
Lopez-Garcia, Purificacion
中科院分区：
文献类型：
--
作者：
Gomez, Fernando;Moreira, David;Lopez-Garcia, Purificacion
甲藻属包含海洋和淡水物种。淡水物种拥有六个扣带板，凹腹区有厚板，通常发育第三个假囊角。海洋角藻属物种（>62 种）拥有五个扣带板和凹腹侧的薄板；第三个假设的角是非典型的。静止囊肿是淡水物种的一个常见特征，但在海洋物种中尚未有报道。我们首次展示了海洋角藻（C. Furca 和 C. candelabrum）的休眠包囊。我们获得了 23 个角藻属物种（超过迄今为止描述的海洋物种总数的三分之一）的小亚基核糖体 RNA 基因 (SSU rDNA) 序列，其中包括四个公认的亚属的代表。包括模式物种淡水 C. hirundinella 在内的系统发育分析表明，淡水物种的四个可用序列形成了一个强有力的支系，与海洋集群相距甚远。我们的数据支持将 Ceratium sensu lato 分为两个属。 Ceratium sensu stricto 应保留给拥有六个扣带板（背面视图为三个扣带板）的淡水物种。新属名 Neoceratium gen。十一月应适用于拥有五个扣带板（背面观有两个扣带板）的海洋物种 Ceratium sensula。 (C) 2009 爱思唯尔有限公司。版权所有。
The dinoflagellate genus Ceratium contains marine and freshwater species. Freshwater species possess six cingular plates, thick plates in the concave ventral area and usually develop a third hypothecal horn. The marine Ceratium species (>62 species) possess five cingular plates and thin plates in the concave ventral area; a third hypothecal horn is atypical. Resting cysts, a common feature in the freshwater species, are unreported in marine species. We illustrate for the first time resting cysts in marine Ceratium species (C. furca and C. candelabrum). We obtained small subunit ribosomal RNA gene (SSU rDNA) sequences of 23 Ceratium species (more than one third of the total marine species described so far), with representatives of the four acknowledged subgenera. Phylogenetic analyses including the type species, the freshwater C. hirundinella, showed that the four available sequences of freshwater species formed a strongly supported subclade, very distant from the marine cluster. Our data support the splitting of Ceratium sensu lato into two genera. Ceratium sensu stricto should be reserved for fresh water species possessing six cingular plates (three cingular plates in dorsal view). The new genus name, Neoceratium gen. nov. should be applied to the marine species of Ceratium sensula to that possess five cingular plates (two cingular plates in dorsal view). (C) 2009 Elsevier GmbH. All rights reserved.