Department of Biology, Queen's University, Kingston, ON, K7P 0S7, Canada.
Department of Biology, University of York, York, YO10 5DD, UK.
Int J Syst Evol Microbiol. 2024 Apr;74(4). doi: 10.1099/ijsem.0.006328.
The alphaproteobacterial order consists of 38 families comprising at least 152 validly published genera as of January 2024. The order was first described in 1957 and underwent important revisions in 2020. However, we show that several inconsistencies in the taxonomy of this order remain and we argue that there is a need for a consistent framework for defining families within the order. We propose a common genome-based framework for defining families within the order , suggesting that families represent monophyletic groups in core-genome phylogenies that share pairwise average amino acid identity values above ~75 % when calculated from a core set of 59 proteins. Applying this framework, we propose the formation of four new families and to reassign the genera , , and into fam. nov., fam. nov., and fam. nov., respectively, and the genera , , , and into fam. nov. We further propose to unify the families , , , and as ; the families and as ; the families and as ; and the families and as . Lastly, we propose to reassign several genera to existing families. Specifically, we propose to reassign the genus to the family ; the genera , , and to the family ; the genus to the emended family ; the genus to the family ; and the genus to the family . Our data also support the recent proposal to reassign the genus to the family .
α-变形菌目由 38 个科组成，截至 2024 年 1 月，至少包含 152 个有效发表的属。该目于 1957 年首次描述，并于 2020 年进行了重要修订。然而，我们表明该目的分类学中仍然存在一些不一致，我们认为有必要为该目中的科定义建立一个一致的框架。我们提出了一个基于共同基因组的框架来定义该目的科，建议科代表核心基因组系统发育中的单系群，当从 59 个核心蛋白计算时，它们的种间平均氨基酸同一性值大于~75%。应用这一框架，我们提出形成四个新的科，并将属、、和 重新分配到科、科和科，分别为 科、科和科，以及属、、和 科。我们进一步建议将科、、、和 统一为科；科 和 统一为科；科 和 统一为科；科 和 统一为科。最后，我们建议将几个属重新分配到现有科。具体而言，我们建议将属 重新分配到科；属、、和 重新分配到科；属 重新分配到科；属 重新分配到科；属 重新分配到科。我们的数据还支持将属 重新分配到科的最新建议。
