ABSTRACT Recently, synonymizing Eisenia with Ecklonia was suggested based on a molecular phylogeny using the rbcL gene and ITS1–5.8S rDNA sequences. However, in a multigene molecular phylogeny based on mitochondrial cox1, cox3 genes and the atp8–16S rDNA region, as well as the plastid atpB, psaA, psbA and rbcL genes, Ecklonia spp. formed a monophyletic clade supported by high statistical values, and Eisenia spp. showed monophyly depending on analytical methods. The Japanese Eisenia species that used to be identified as Eisenia arborea (E. arborea sensu Arasaki) was shown to be genetically distant from E. arborea from the NE Pacific and E. bicyclis from Japan. Eisenia spp. were morphologically distinct in having a split meristematic zone in the mature thallus forming a dorsi-ventral blade with false branches. Therefore, we propose reinstatement of Eisenia as an independent genus and describe a new species, Eisenia nipponica (= E. arborea sensu Arasaki) from Japan. E. nipponica is distributed on the Pacific Coast of central Honshu, having a separate geographic range from E. bicyclis, which is distributed on the Pacific coast of eastern Honshu and the Sea of Japan coast of north-western Honshu and northern Kyushu.

中文翻译：

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Eisenia 的多基因分子系统发育揭示了来自日本的新物种 Eisenia nipponica (Laminariales) 的证据

摘要 最近，基于使用 rbcL 基因和 ITS1-5.8S rDNA 序列的分子系统发育，建议将 Eisenia 与 Ecklonia 同义。然而，在基于线粒体 cox1、cox3 基因和 atp8-16S rDNA 区域以及质体 atpB、psaA、psbA 和 rbcL 基因的多基因分子系统发育中，Ecklonia spp. 形成了一个由高统计值支持的单系进化枝，Eisenia spp。根据分析方法显示单系。曾经被鉴定为 Eisenia arborea (E. arborea sensu Arasaki) 的日本 Eisenia 物种被证明与来自东北太平洋的 E. arborea 和来自日本的 E. bicyclis 在遗传上相距甚远。艾森尼亚属 在成熟的叶状体中有一个分裂的分生组织区，形成一个带有假枝的背腹叶片，在形态上是不同的。所以，我们建议将 Eisenia 恢复为一个独立的属，并描述了一个来自日本的新物种 Eisenia nipponica (= E. arborea sensu Arasaki)。E. nipponica 分布于本州中部太平洋沿岸，与分布于本州东部太平洋沿岸和本州西北部和九州北部的日本海沿岸的 E. bicyclis 有不同的地理范围。