This is the level at which human and all extinct siblings lie, with no other extant species, all others were killed or fucked to death: Section "Interbreeding between archaic and modern humans".
The key cladograms:
- Hominoidea level for extant species separation
- Australopithecine level for extinct species separation: en.wikipedia.org/w/index.php?title=Homo&oldid=1155900663#Phylogeny
Naming taxonomic ranks like genus, domain, etc. is a fucking waste of time, only useful before we developed molecular biology.
All that matters is the tree of clades with examples of species in each clade, and common characteristics shared by the clade.
And with molecular biology, we can build those trees incredibly well for extant species. When extinct species are involved however, things get more complicated.