The new species of hominid, the evolutionary branch of primates that includes humans, is to be revealed when the two-million-year-old skeleton of a child is unveiled this week. Scientists believe the almost-complete fossilised skeleton belonged to a previously-unknown type of early human ancestor that may have been a intermediate stage as ape-men evolved into the first species of advanced humans, Homo habilis.   Related Articles Let children collect flowers and fossils says Sir David Attenborough T-Rex's long lost Australian cousin found for first time Jurassic Coast bans fossil hunters Attenborough's missing link Fossil could rewrite human evolution Ida the 'missing link': fossil of man's earliest ancestor goes on display Experts who have seen the skeleton say it shares characteristics with Homo habilis, whose emergence 2.5 million years ago is seen as a key stage in the evolution of our species.