Homo ergaster
At least a dozen species of "Homo" other than "Homo sapiens" have been proposed, with varying degrees of consensus. "Homo erectus" is widely recognized as the species directly ancestral to "Homo sapiens". Most other proposed species are proposed as alternatively belonging to either "Homo erectus" or "Homo sapiens" as a subspecies. This concerns "Homo ergaster" in particular. One proposal divides "Homo erectus" into an African and an Asian variety; the African is "Homo ergaster," and the Asian is "Homo erectus sensu stricto." (Inclusion of "Homo ergaster" with Asian "Homo erectus" is "Homo erectus sensu lato.") There appears to be a recent trend, with the availability of ever more difficult-to-classify fossils such as the Dmanisi skulls (2013) or "Homo naledi" fossils (2015) to subsume all archaic varieties under "Homo erectus".