Genome-based reclassification of as a later heterotypic synonym of .

Both the genera and are members of the family . Their type species, both Sanger_33 and ASD5720, were isolated from human faeces. A comparison of their 16S rRNA gene sequences revealed 100% similarity, suggesting their close relatedness and the possibility of belonging to the same species. To clarify their taxonomic relationship, genome-based analyses were carried out. Overall genomic relatedness indices analyses indicated that Sanger_33 shared average amino acid identity and percentage of conserved proteins prediction values higher than the -specific genus-level thresholds with ASD5720, as well as the other two existing species of the genus . Additionally, Sanger_33 formed a distinct branch with ASD5720, clustering with the other two species of the genus into the same clade in both the 16S rRNA gene phylogenetic tree and the core-genome phylogenomic tree. Essentially, both the average nucleotide identity and digital DNA-DNA hybridization prediction values between Sanger_33 and ASD5720 were above the recommended species boundaries. It is thus clear that Sanger_33 and ASD5720 constitute the same species. On the basis of the earliest valid publication, priority is given to Chaplin . 2022. Based on this, the orphan species Hitch . 2022 is reclassified as a later heterotypic synonym of Chaplin . 2022, along with the reclassification of the genus Hitch . 2022 as a later synonym of Chaplin . 2022.