Systematics of the Gracilariales (Rhodophyta) including new subfamilies, tribes, subgenera, and two new genera, Agarophyton gen. nov. and Crassa gen. nov.
Systematics of the Gracilariales (Rhodophyta) including new subfamilies, tribes, subgenera, and two new genera, Agarophyton gen. nov. and Crassa gen. nov.
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DOI：
10.11646/phytotaxa.374.1.1
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发表时间：
2018-11-01
期刊：
影响因子：
1.1
通讯作者：
Fredericq, Suzanne
中科院分区：
文献类型：
--
作者：
Gurgel, Carlos Frederico D.;Norris, James N.;Fredericq, Suzanne
龙须菜目是一个大型红藻目，也是全球重要的琼脂（一种海洋藻胶）的主要来源。在过去的20年里，独立的比较形态学和分子系统发育研究显示，存在7个主要的分支可识别为不同的属。在这些主要分支中，只有四个自由生活的属被广泛接受：Curdiea，Melanthalia，Gracilariopsis和Gracilaria。其他三个分支包括恢复属Hydropuntia和建议的两个新属，Agarophyton和Crassa，在此描述。基于新的rbcL DNA序列，并沿着与出版的比较形态和分子系统发育研究的重新评估，我们认为，后三个属代表了不同的进化谱系中的江蓠科，并提出了一个新的分类江蓠目。我们的新建议结合了最新的理解的进化历史的顺序，建立了一个自然和稳定的分类系统，并提供了家庭内的职级的认可的基础。我们的分类方案调和了迄今为止发表的所有分子系统发育研究。
The Gracilariales is a red macroalgal order and the main global source of the economically important agar, a marine phycocolloid. Independent comparative morphological and molecular phylogenetic studies over the last 20 years have revealed the existence of seven major clades recognizable as distinct genera. Of these major clades only four free-living genera have been widely accepted taxonomically: Curdiea, Melanthalia, Gracilariopsis, and Gracilaria. Three other clades comprise the reinstatement of the genus Hydropuntia and the proposal of two new genera, Agarophyton and Crassa, described herein. Based on new rbcL DNA sequences, and along with a reassessment of published comparative morphological and molecular phylogenetic studies, we argue that the latter three genera represent distinct evolutionary lineages in the Gracilariaceae, and propose a new classification for the order Gracilariales. Our new proposal incorporates the most current understanding of the evolutionary history of the order, establishes a natural and stable classification system, and provides the basis for the recognization of intra-family ranks. Our classification scheme reconciles all molecular phylogenetic studies published to date.