Organisers said that scientists led by Norway's fossil expert, professor Jorn Hurum, worked for two years on Ida, first discovered in 1983 by private collectors who failed to understand her importance - and split the bones into two lots.
The monkey-like creature was preserved through the ages in Germany's Messel Pit, a crater rich in Eocene Epoch fossils.
Although bearing a long tail, she had several human characteristics, including an opposable thumb, short arms and legs, and forward facing eyes. She also lacked two key elements of modern lemurs: a grooming claw and a row of lower teeth known as the toothcomb.
"This is the first link to all humans - truly a fossil that links world heritage," Prof Hurum said.
"The link they would have said until now is missing... it is no longer missing," he said.
"Ida slipped into unconsciousness, was washed into the lake, and sank to the bottom, where the unique conditions preserved her for 47 million years," organisers said.
Her last meal shows she was a herbivore. Gut contents revealed remains of fruits, seeds and leaves.
"This fossil is so complete. Everything's there. It's unheard of in the primate record at all. You have to get to human burial to see something that's this complete," Prof Hurum said.
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