Final answer:
The species with the smallest head, bipedal locomotion, no use of fire or tools, no hunting practices, and the longest duration on Earth is likely among early hominids like Australopithecus or perhaps even earlier ancestors.
Step-by-step explanation:
The species you are referring to that had the smallest head, exhibited bipedalism, did not use fire or tools, did not hunt, and lived on Earth the longest, is likely one of the early hominids preceding Homo habilis and Homo erectus. Since Homo habilis was known for tool-making and Homo erectus is recognized for more advanced features compared to earlier hominids, it suggests that the species in question might be more primitive, such as Australopithecus or Ardipithecus.
The species Australopithecus, for instance, has been known for bipedalism and was represented by several species that lived over a span that includes several million years. They had smaller brain sizes compared to Homo species and lacked the use of fire and sophisticated tools. Although not the direct answer to your question, Australopithecus provides a point of reference for understanding the type of primitive hominids that fit the description you are asking about.