The taxonomic status and species diversity of the brown algal genus Padina (Dictyotales, Phaeophyceae) was assessed based on DNA sequences and the morpho‐anatomy of specimens collected worldwide, especially from tropical and subtropical western Pacific regions. Phylogenetic analyses using chloroplast rbcL and mitochondrial cox3 gene sequences demonstrated four distinct clades for newly collected samples with high bootstrap support. Each species clade possesses a suite of morphological features that are not shared by any known species of Padina. These are P. imbricata sp. nov., Padina lutea sp. nov., P. moffittianoides sp. nov., and P. nitida sp. nov. The occurrence of these and other species of Padina clearly points to an elevated diversity of the genus in tropical/subtropical waters of the western Pacific. Phylogenetic analyses provided new insights into biogeographic characteristics of the genus, with many species in the Pacific Ocean showing shared/overlapping distributions, whereas species from the Mediterranean/Atlantic and/or the Indian Ocean tend to be confined to particular regions. Consideration has also been given to the evolutionary time frame of the genus Padina based on molecular time trees: a time tree of the concatenated data set (rbcL + cox3) revealed the estimated divergence time in the mid‐Cretaceous, whereas those of cox3 and rbcL showed older estimates pointing to the periods of mid‐Jurassic and Early Cretaceous, respectively.

中文翻译：

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Padina 物种（网皮藻目、褐藻纲）的全球多样性和地理分布：基于分子和形态学分析的新见解


根据 DNA 序列和世界各地（尤其是热带和亚热带西太平洋地区）采集的标本的形态解剖学，评估了褐藻属（网皮藻目、褐藻纲）的分类状况和物种多样性。使用叶绿体rbc L 和线粒体cox 3 基因序列进行的系统发育分析表明，新收集的样品具有四个不同的分支，具有高 bootstrap 支持。每个物种进化枝都拥有一套形态特征，这些特征是任何已知的Padina物种所不具备的。这些是P. imbricata sp。十一月， Padina utea sp。 nov.， P. moffittianoides sp。 nov.，和P.nitida sp。十一月这些和其他扇贝属物种的出现清楚地表明该属在西太平洋热带/亚热带水域的多样性有所增加。系统发育分析为该属的生物地理特征提供了新的见解，太平洋中的许多物种表现出共享/重叠的分布，而来自地中海/大西洋和/或印度洋的物种往往局限于特定区域。还考虑了基于分子时间树的Padina属的进化时间框架：串联数据集（ rbc L + cox 3）的时间树揭示了白垩纪中期的估计分歧时间，而cox的时间树揭示了白垩纪中期的估计分歧时间。 3和rbc L显示了较旧的估计，分别指向侏罗纪中期和白垩纪早期。