What gets me the most is having to provide research on info I speak to all the time. I came here knowing very little and still assume most of you guys know more. I am wrong. I spend most of my time justifying simple statements I expect you to understand and have knowledge of. It is incredibly boring. Then if I dont reply I get accused of something or other thats not nice.
Here is some info on Lucy. Hopefully you are satisfied
Copyright © 2007 by The National Academy of Sciences of the USA
Anthropology
From the Cover
Gorilla-like anatomy on Australopithecus afarensis mandibles suggests Au. afarensis link to robust australopiths
Yoel Rak,* Avishag Ginzburg,* and Eli Geffen
Mandibular ramus morphology on a recently discovered specimen of
Australopithecus afarensis closely matches that of gorillas. This finding was unexpected given that chimpanzees are the closest living relatives of humans. Because modern humans, chimpanzees, orangutans, and many other primates share a ramal morphology that differs from that of gorillas, the gorilla anatomy must represent a unique condition, and its appearance in fossil hominins must represent an independently derived morphology. This particular morphology appears also in
Australopithecus robustus. The presence of the morphology in both the latter and
Au. afarensis and its absence in modern humans cast doubt on the role of
Au. afarensis as a modern human ancestor. The ramal anatomy of the earlier
Ardipithecus ramidus is virtually that of a chimpanzee, corroborating the proposed phylogenetic scenario.
Also 
Wiki Lucy Australopithecus.. additional research is cited in Wiki
The discovery of this
hominid was significant as the skeleton shows evidence of small skull capacity akin to that of
apes and of
bipedal upright walk akin to that of
humans, providing further evidence supporting the view that bipedalism preceded increase in brain size in human evolution,
[5][6] though other findings have been interpreted as suggesting that
Australopithecus afarensis was not directly ancestral to humans.
[7] In 1994, a new hominid,
Ardi, was found, pushing back the earliest known hominid date to 4.4 million years ago, although details of this discovery were not published until October 2009.
[8]
Other findings
A study of the
mandibular structure of a number of specimens of
Au. Afarensis indicated that Lucy's jaw was rather unlike other hominins, having a more gorilla-like appearance.
[18] Rak
et al. consider that this mandible structure arose "independently in gorillas and hominins", but that
Au. Afarensis is therefore "too
derived to occupy a position as a common ancestor of both the
Homo and
robust australopith clades".
[7]