A revised classification of orders and families in the two major subclasses of Lecanoromycetes (Ascomycota) based on a temporal approach
A revised classification of orders and families in the two major subclasses of Lecanoromycetes (Ascomycota) based on a temporal approach
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DOI：
10.1093/botlinnean/boy060
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发表时间：
2018-11-01
影响因子：
2.4
通讯作者：
Lumbsch, H. Thorsten
中科院分区：
文献类型：
--
作者：
Kraichak, Ekaphan;Huang, Jen-Pan;Lumbsch, H. Thorsten
高于物种水平的分类等级本质上是任意的。然而，有越来越多的出版物旨在更一致的分类，在分类群之间有比较的等级。在这项研究中，我们使用了最近开发的时间方法，该方法利用时间校准的计时器来识别和定义Lecanoromycetes中可比较的序数和家族等级的时间带，Lecanoromycetes是地衣形成真菌中最多样化的谱系。利用多基因座的数据集，对Lecanoromycetidae和Ostropomycetidae两个主要亚类的539个类群进行分析，确定了Lecanoromycetidae科和目的划分。基于时间带的方法，在176 - 194亿a和111-135亿a的时间窗口中有共同祖先的进化枝分别对应于目级和科级。大多数目前公认的目和科在其目前的范围内得到支持，但也描述了一些新的分类群。在这里，我们提出了一个修订的，基于时间的两个子类的分类。具体来说，提出了三个新秩序：Sporastatiales， Schaereriales和Thelenellales。Arctomiales， Hymeneliales和Trapeliales与baeomycetale同义。水痘科作为一个新科被提出，水痘科和水痘科被复活。Squamarinaceae和Stereocaulaceae与Cladoniaceae同义，Carbonicolaceae与Lecanoraceae同义，Letrouitiaceae与Brigantiaeaceae同义，Lobariaceae和Nephromataceae与Peltigeraceae同义，Thrombiaceae与Protothelenellaceae同义，Miltideaceae与Agyriaceae同义。这项研究代表了在最多样化的地衣形成真菌谱系中更一致，可比较的更深层次分类排名的重要一步。
Taxonomic ranks above the species level are inherently arbitrary. However, there is a growing number of publications aimed at more consistent classifications with comparable ranks among taxa. For this study, we use a recently developed temporal approach that utilizes time-calibrated chronograms to identify and define temporal bands for comparable ordinal and family ranks in Lecanoromycetes, the most diverse lineage of lichen-forming fungi. A multilocus dataset consisting of 539 taxa in the two major subclasses of Lecanoromycetes, Lecanoromycetidae and Ostropomycetidae, was used to address the circumscription of families and orders. Based on the temporal banding approach, clades that share a common ancestor between 176 and 194 Mya and a time window of 111-135 Mya correspond to order-level and family-level, respectively. Most currently accepted orders and families were supported in their current circumscription, but some new taxa are described. Here we propose a revised, temporally based classification for the two subclasses. Specifically, three new orders are proposed: Sporastatiales, Schaereriales and Thelenellales. Arctomiales, Hymeneliales and Trapeliales are synonymized with Baeomycetales. Varicellariaceae are proposed as a new family, and Diploschistaceae and Thelotremataceae are resurrected. Squamarinaceae and Stereocaulaceae are synonymized with Cladoniaceae, Carbonicolaceae are synonymized with Lecanoraceae, Letrouitiaceae are synonymized with Brigantiaeaceae, Lobariaceae and Nephromataceae are synonymized with Peltigeraceae, Thrombiaceae are synonymized with Protothelenellaceae, and Miltideaceae are synonymized with Agyriaceae. This study represents an important step towards more consistent, comparable deeper-level taxonomic rankings in the most diverse lineages of lichen-forming fungi.