Oldest Human Fossil Discovered In Ethiopia
Source: Voactiv
This 2.8 million-year-old jawbone may be the oldest human fossil in existence, according to two papers published simultaneously in Science. Researchers now suspect that Homo (the genus that includes modern humans) dates back at least 400,000 years earlier than previously thought.
For decades scientists have been scouring Africa for ancient human remains. Archaeologists think Homo habilis, the first truly “human-like” primate, lived about 2.5 million years ago, and Lucy, the human-ape mashup who is perhaps our most famous ancestor, lived about 3.2 million years ago.
But this particular fossil, found in the Afar region of Ethiopia and temporarily named LD 350-1, appears to be a new type of Homo that falls right between Lucy and Homo habilis. The fossil’s slim molars and proportionate jaw are hallmarks of habilis, for instance, but its primitive chin looks a lot more like Lucy’s. For now, the researchers are calling their discovery “Homo species indeterminate,” as they still aren’t exactly sure what it is.
Most 2.8 million-year-old fossils are too ancient to date by conventional means, so the researchers sampled volcanic ash above and below the jawbone and then used argon40 dating to determine the age of the eruption that formed each sample. The results give us the youngest and oldest dates that the hominin who owned LD 350-1 could have lived—2.5 and 2.8 million years ago, respectively.
Read more: http://www.vocativ.com/culture/science/oldest-human-fossil/
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The genus Homo comes from the Latin noun homo, hominis, which means man.
The English combining form "homo-" (as in "homogeneous" or "homosexual"
comes from the Greek adjective ὁ?ό?, ή, ό?, which means same.
Or the oldest human fossil which has been unearthed. Unless, of course it does not become a fossil until somebody finds it. 
You have supplied a picture of Densus Arizonus Mavrickus
It also includes Chenesus Horibilis,
Patrickus Fraudulus
and others
all are a subset of Subhomo Ignoramus Ubiquitous
God knows it looks better than this one:
