Final answer:
Ardipithecus kadabba was identified as an early hominid species closely related to A. ramidus, which was discovered by Tim White. While the exact discoverer of A. kadabba is not mentioned, it dates back to about 5.6 MYA and is believed to have been bipedal.
Step-by-step explanation:
The species Ardipithecus kadabba was identified as one of the early hominids. While the discovery of Ardipithecus kadabba's specific discoverer is not directly mentioned in the provided information, it is closely related to the genus of Ardipithecus, of which a different species, Ardipithecus ramidus, was found by American paleoanthropologist Tim White in 1992. Ardipithecus kadabba is older than A. ramidus, dating to about 5.6 million years ago (MYA). The classification and the possibility of this genus being a direct human ancestor remain uncertain, but its traits suggest it could walk on two legs (bipedal). Moreover, the discovery of various fossils over the years has shed light on different aspects of its physiology and its potential behaviors.