Short answers, pulled from the story.
Friedrich Engels published Der Ursprung der Familie, des Privateigentums und des Staats in 1884. This work introduced the German term Urgesellschaft to describe human coexistence before recorded history.
Lewis Henry Morgan translated his own book Ancient Society into German as Die Urgesellschaft in 1908. The translation occurred after Engels had originally published his work on primitive society.
The Stone Age spans more than three million years according to archaeological estimates. Lower Paleolithic dates range from 3.3 Ma to 300 ka while Middle Paleolithic covers 300 to 50 ka and Upper Paleolithic extends from 50,000 to 12,000 BC.
Dieter Reinisch edited Der Urkommunismus: Auf den Spuren der egalitären Gesellschaft published by Promedia in Wien 2012. The term emphasizes the absence of economic hierarchy among early human groups within historical materialism.
Other representatives of the genus Homo included Homo erectus and Neanderthal species. These groups coexisted with early Homo sapiens during the Paleolithic period before modern macrosociological theories examined biological classification.