Ar. ramidus is considered by some to be the oldest-known hominid. Ar. ramidus shares some novel characteristics with later hominids, including being bipedal and its teeth. As the molars of Ar. ramidus are smaller than those of any of the Australopithecus species. Further evidence, indicates that it may have been a woodland forest dweller. 

(Note: This species has not yet been fully described because some of the specimens have been difficult to extract from the surrounding rock.)

Ardipithecus Ramidus 

Ardipithecus kadabba is a hominin species that lived about 5.2-5.7mya in the Middle Awash region. Post-crania reveals push-off ability of the big toe, which is associated with bipedalism.

Ardipithecus kadabba

- Ardipithecus ramidus
- Ardipithecus kadabba

Arizona State University

Ardipithecus is considered the earliest known genus of the zoological family Hominidae (the group that includes humans and excludes great apes) .

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