This video says about itself:
Professor Donald Johanson, the paleoanthropologist responsible for unearthing the first known remains of Australopithecus afarensis, describes how his discovery ended up with the name “Lucy.” Johanson explains that what started out as an off-the-cuff suggestion, ended up securing the fossil a place in popular culture.
A team of scientists has announced the discovery of a 3.4 million-year-old partial foot from the Woranso-Mille area of the Afar region of Ethiopia. The fossil foot did not belong to a member of “Lucy‘s” species, Australopithecus afarensis, the famous early human ancestor. Research on this new specimen indicates that more than one species of early human ancestor existed between 3 and 4 million years ago with different methods of locomotion. The analysis will be published in the March 29, 2012 issue of the journal Nature: here.