Molecular systematics of Crassiphycus and Hydropuntia (Gracilariales, Rhodophyta) with the description of poorly known taxa in the Western Atlantic Ocean
Molecular systematics of Crassiphycus and Hydropuntia (Gracilariales, Rhodophyta) with the description of poorly known taxa in the Western Atlantic Ocean
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DOI：
10.1080/09670262.2020.1814424
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发表时间：
2020-10
影响因子：
2.4
通讯作者：
C. Gurgel;L. P. Soares;J. N. Norris;M. Fujii;W. Schmidt;S. Fredericq
中科院分区：
文献类型：
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作者：
C. Gurgel;L. P. Soares;J. N. Norris;M. Fujii;W. Schmidt;S. Fredericq
摘要本研究建立在最近的处理海洋红藻江蓠科（江蓠目），重点详细介绍了Hydropuntia和Crassiphycus。这两个属中的物种通常存在识别问题，由于遗传上不同的物种之间的高水平的形态相似性，以及高水平的表型可塑性，导致伪隐物种形成和同源性。为了解决长期存在的问题，澄清一些物种的概念，更好地了解该组的进化，我们进行了系统发育分析的所有质体rbcL DNA序列已知的Hydropuntia和Crassiphycus物种，包括新测序的标本。我们的研究结果揭示了潜在的未描述的物种的存在，存在强大的地理模式低于和高于物种的水平，并帮助重新划定形态相似的类群。提供了三种常见但知之甚少的西大西洋物种的新的详细形态描述：C。secundus，C. usneoides和H. rangiferina。H. rangiferina是一个与真正的H. rangiferina和代表一个假定的未描述的种。我们还提供了一个时间校准的龙须菜目中的六个属，以确定过去的地质和气候过程与他们的起源和多样化。
ABSTRACT This study builds on recent treatments of the marine red algal family Gracilariaceae (Gracilariales) focusing in detail on Hydropuntia and Crassiphycus. Species in these two genera often present identification problems due to high levels of morphologial similarity among genetically distinct species, and high levels of phenotypic plasticity, leading to pseudo-cryptic speciation and homoplasies. In order to resolve long standing problems, clarify some species concepts and better understand the evolution of the group, we performed phylogenetic analyses of all plastid rbcL DNA sequences available for known Hydropuntia and Crassiphycus species, including newly sequenced specimens. Our results revealed the presence of potentially undescribed species, the existence of strong phylogeographic patterns below and above the species level and helped re-delineate morphologically similar taxa. New detailed morphological descriptions for three common yet poorly known Western Atlantic species are provided: C. secundus, C. usneoides and H. rangiferina. H. rangiferina from the Indo-Pacific is a distinct species from the true H. rangiferina and represents a putative undescribed species. We also provide a time-calibrated phylogeny for the six genera in the Gracilariales to identify past geological and climatic processes associated with their origin and diversification.