Neanderthals, denisovans, homo erectus, etc. were likely just members of the shared human species together with surviving homo sapiens. You could say they were

Neanderthals, denisovans, homo erectus, etc. were likely just members of the shared human species together with surviving homo sapiens. You could say they were separate subspecies, but it's not clear that such a designation is reasonable without likewise considering various groups of bushmen and pygmies (e.g. khoi, san, hadza, mbuti) separate subspecies from each other and from the rest of humans as well.