In the post-genomic era, phylogenomics is a powerful and routinely-used tool to discover evolutionary relationships between
microorganisms. Inferring phylogenomic trees by concatenating core gene sequences into a supermatrix is the standard
method
. The previously released up-to-date bacterial core gene (UBCG) tool provides a pipeline to infer phylogenomic trees
using single-copy core genes for the Bacteria domain. In this study, we established up-to-date archaeal core gene (UACG),
comprising 128 genes suitable for inferring archaeal phylogenomic trees. To test the gene set, we selected the Haloarcula
genus and scrutinized its phylogeny. The phylogeny inferred using the UACG tool was consistent with the orthoANIu
dendrogram, whereas the 16S rRNA gene phylogeny showed high intragenomic heterogeneity resulting in phylogenetic
discrepancies. The software tool using the UACG set is available at https:// www. ezbio cloud. net/ tools/ uacg.