Diversity of Kallymeniaceae (Gigartinales, Rhodophyta) associated with Hawaiian mesophotic reefs
Diversity of Kallymeniaceae (Gigartinales, Rhodophyta) associated with Hawaiian mesophotic reefs
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DOI：
10.1080/09670262.2021.1891462
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发表时间：
2021-04-09
影响因子：
2.4
通讯作者：
Sherwood, Alison R.
中科院分区：
文献类型：
--
作者：
Cabrera, Feresa P.;Huisman, John M.;Sherwood, Alison R.
小红藻形态可变叶片已被广泛收集从夏威夷珊瑚礁，但对许多标本的分类仍然知之甚少。在对Papahanaumokuakea海洋国家保护区（PMNM）和夏威夷主群岛（MHI）的调查中，我们发现了两种未描述的小型（< 5厘米）红色叶片分类群，根据形态学和分子分析，它们与Psaromenia和Meredithia属相匹配。这两个属以前在夏威夷群岛都没有记录，而且这两组标本都不符合目前描述的这两个属的物种。因此，这些标本在这里被描述为在家庭Kallymeniaceae新物种。laulamaulaPsaromeniasp. nov.，仅见于PMNM的中光深度（83-94 m），通过其比较大的前果期果荚分支系统和单生倒卵形粉红色至洋红色叶片，很容易与该属的其它成员区分。与此相反，夏威夷梅雷迪思属（Meredithia hawaiiensis sp. nov.）出现在浅水（0-17米）和中光深度（55米），具有高度的形态可塑性，与其他Meredithia物种的特征重叠，只能根据DNA序列进行区分。这项研究提供了更多的证据，在Kallymeniaceae的多样性程度，是从中光深度差的特点，并提供了进一步的证据表明，成员的大型藻类植物群包含被忽视的生物多样性。
Small red algal morphologically variable blades have been extensively collected from Hawaiian reefs, but for many specimens their taxonomy remains poorly understood. In surveys of the Papahanaumokuakea Marine National Monument (PMNM) and Main Hawaiian Islands (MHI), we discovered two taxa of undescribed small (< 5 cm) red blades that matched the genera Psaromenia and Meredithia, based on morphology and molecular analyses. Neither genus has been previously recorded in the Hawaiian Islands, and neither group of specimens matched currently described species in these two genera. Accordingly, these specimens are described here as new species within the family Kallymeniaceae. Psaromenia laulamaula sp. nov., exclusively found at mesophotic depths (83-94 m) in PMNM, is easily distinguished from other members of the genus by its comparatively large, procarpic carpogonial branch system and solitary obovate pink-to-magenta blades. Conversely, Meredithia hawaiiensis sp. nov., occurring in both shallow (0-17 m) and mesophotic depths (55 m), has high morphological plasticity, with characters that overlap with other Meredithia species, and can only be distinguished based on DNA sequences. This study provides additional evidence of the extent of diversity in the Kallymeniaceae that is poorly characterized from mesophotic depths and provides further evidence that members of the macroalgal flora contain overlooked biodiversity.