The identity of Centrodinium elongatum, type species of the dinoflagellate genus Centrodinium (Dinophyceae), and a review on the synonymy of allied species.
Fernando Gómez, Tania Corina Navarrete-Carlos, Yahir Enrique López-Osorio, Huan Zhang, Eugenio Raymond, Rafael Salas, Rosalba Alonso-Rodríguez, Senjie Lin
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引用次数: 0
Abstract
The planktonic dinoflagellate genus Centrodinium has been understudied, with the type species C. elongatum remaining undocumented since the original description. Here, we report C. elongatum isolated from Mazatlán, Mexican Pacific. In the chains, the posterior daughter cell with an incomplete apical horn shows the morphology of C. elongatum, while the anterior daughter cell with complete epitheca corresponds to C. pulchrum. For the first time, a species of Centrodinium sensu stricto (highly laterally flattened species with horns) was cultured. An unarmored life stage, known as Murrayella ovalis, derived from the spheroplast after ecdysis. In the rDNA molecular phylogenies, C. elongatum (=C. pulchrum) nested as basal to morphologically similar species (C. eminens and C. intermedium) and as a sister group of a former Murrayella species, C. punctatum. C. elongatum differs from C. eminens and C. intermedium in the chain formation, second apical (2') plate not being divided, horns with coarse poroid ornamentation, and missing prominent distal spinules. The taxonomy of Centrodinium sensu stricto is revised, with a discussion in the identities of C. complanatum, C. eminens, and C. maximum. The name C. deflexum is restored as a senior synonym of C. intermedium and C. ovale.
浮游甲藻 Centrodinium 属的研究一直不足,其模式种 C. elongatum 自原始描述以来一直未被记录。在此,我们报告了分离自墨西哥太平洋马萨特兰的 C. elongatum。在链中,带有不完整顶角的后部子细胞显示出 C. elongatum 的形态,而带有完整表皮的前部子细胞则与 C. pulchrum 相符。首次培养出了严格意义上的百日草(角高度侧扁的物种)。蜕皮后的球形体中产生了一种无甲壳的生命阶段,即卵圆形穆氏菌(Murrayella ovalis)。在 rDNA 分子系统进化中,C. elongatum(=C. pulchrum)与形态上相似的物种(C. eminens 和 C. intermedium)同属一个基干类群,并且是前 Murrayella 物种 C. punctatum 的姊妹类群。C. elongatum 与 C. eminens 和 C. intermedium 的不同之处在于其链状结构、第二顶端(2')板不分裂、角具粗孔状装饰以及缺少突出的上部小刺。对严格意义上的百日草分类进行了修订,并讨论了 C. complanatum、C. eminens 和 C. maximum 的身份。deflexum恢复为 C. intermedium 和 C. ovale 的高级异名。
期刊介绍:
The Journal of Eukaryotic Microbiology publishes original research on protists, including lower algae and fungi. Articles are published covering all aspects of these organisms, including their behavior, biochemistry, cell biology, chemotherapy, development, ecology, evolution, genetics, molecular biology, morphogenetics, parasitology, systematics, and ultrastructure.