The order Enterobacterales was divided into seven families including the family Enterobacteriaceae in 2016. The genus Klebsiella within the family Enterobacteriaceae was divided into two genera Klebsiella and Raoultella in 2001. Here, our phylogenomic analysis shows that the genus Raoultella is nested within the genus Klebsiella. Klebsiella and Raoultella together are monophyletic and share average amino acid identities (AAIs) of 86.9–89.6% above the AAI threshold (86%) for genus delimitation within the family Enterobacteriaceae. Klebsiella and Raoultella share AAIs of 79.9%–85.0% with the other genera within the subfamily “Klebsiella clade”, which are in the range of inter-genus AAIs (74–85%) within the family Enterobacteriaceae. Klebsiella and Raoultella also share six known conserved signature indels. Therefore, we propose to reunify Klebsiella and Raoultella to the single genus Klebsiella and reclassify Raoultella electrica as Klebsiella electrica comb. nov. Our genome-based taxonomic analyses also identified seven potential novel species within the unified genus Klebsiella.

肠杆菌目在2016年被分为包括肠杆菌科在内的7个科。肠杆菌科内的克雷伯菌属在2001年被分为克雷伯菌属和拉乌尔菌属两个属。在这里，我们的系统发育分析表明，拉乌尔菌属嵌套在克雷伯菌属中。克雷伯氏菌和拉乌尔氏菌属单系，平均氨基酸同一性 (AAI) 高于肠杆菌科内属划分的 AAI 阈值 (86%) 86.9-89.6% 。克雷伯氏菌和Raoultella与“克雷伯菌进化枝”亚科中的其他属共享 79.9%–85.0% 的 AAI，这些属属于肠杆菌科内的属间 AAI (74–85%) 。Klebsiella和Raoultella还共享六个已知的保守特征插入缺失。因此，我们建议将克雷伯菌和拉乌尔菌重新统一为克雷伯菌属，并将电拉乌尔菌重新分类为电克雷伯菌。十一月 我们基于基因组的分类学分析还确定了统一的克雷伯氏菌属中的七个潜在新物种。