Final answer:
The term that describes all human species ever existed, excluding chimpanzees and gorillas, is hominin, which includes genera like Homo, Australopithecus, and others known for bipedalism. Hominid refers to additionally including the great apes and their ancestors. Homo sapiens is the only surviving species of its genus, which is part of the hominid family.
Step-by-step explanation:
The taxonomic name that describes all the human species to have ever existed, excluding chimpanzees and gorillas, is hominin. The term hominin refers to the group representing modern humans, all extinct human species, and all of humanity's immediate ancestors, including the genera Homo, Australopithecus, Paranthropus, and Ardipithecus. All hominins are known for sharing the anatomical behavioral complex of bipedal locomotion. On the other hand, the hominid family encompasses not just humans but also the extinct great apes, chimpanzees, gorillas, orangutans, and their immediate ancestors.
Our species, Homo sapiens, falls under the genus Homo which is part of the hominid family. This family, within the order Primates, has seen the evolution of several species with Homo sapiens being the sole survivor. Early Homo species displayed full bipedalism but had smaller brains compared to modern humans and are now extinct.
The human evolutionary process suggests that our lineage diverged from a common ancestor with chimpanzees around six million years ago. Bipedal hominins include various groups that are considered part of modern human lineage, such as Australopithecus, Homo habilis, and Homo erectus, and non-ancestral groups like Neanderthals and Denisovans.