Here is some info.
"Species
While the exact number of early human species is debated, on this page are links to summaries of the early human species accepted by most scientists. Click on any species to learn more about it.
Below the summaries is a chart showing the time span during which fossils of each species have been found."
Species | The Smithsonian Institution's Human Origins Program
Homo erectus
"Where Lived: Northern, Eastern, and Southern Africa; Western Asia (Dmanisi, Republic of Georgia); East Asia (China and Indonesia)
When Lived: Between about 1.89 million and 143,000 years ago"
"Early African Homo erectus fossils (sometimes called Homo ergaster) are the oldest known early humans to have possessed modern human-like body proportions with relatively elongated legs and shorter arms compared to the size of the torso. These features are considered adaptations to a life lived on the ground, indicating the loss of earlier tree-climbing adaptations, with the ability to walk and possibly run long distances. Compared with earlier fossil humans, note the expanded braincase relative to the size of the face. The most complete fossil individual of this species is known as the Turkana Boy a well-preserved skeleton (though minus almost all the hand and foot bones), dated around 1.6 million years old. Microscopic study of the teeth indicates that he grew up at a growth rate similar to that of a great ape. There is fossil evidence that this species cared for old and weak individuals. The appearance of Homo erectus in the fossil record is often associated with the earliest handaxes, the first major innovation in stone tool technology.
Early fossil discoveries from Java (beginning in the 1890s) and China (Peking Man, beginning in the 1920s) comprise the classic examples of this species. Generally considered to have been the first species to have expanded beyond Africa, Homo erectus is considered a highly variable species, spread over two continents (it's not certain whether it reached Europe), and possibly the longest lived early human species - about nine times as long as our own species, Homo sapiens, has been around!"
Homo erectus
There is more information on the page as well.
"Homo erectus Topics:
click a topic to view it below"
Homo erectus
There is also a section
""How do we know..."
The aim of science is to build more accurate and powerful natural explanations of how the world worksand that requires testing ideas with observations and evidence to build scientific hypotheses and to generate predictions. The following examples explain how different kinds of evidence help scientists "know what we know", and how we use that evidence to draw conclusions about what happened in the past.
How Do We Know Humans Are Primates?
How Do We Know These Skulls Are Early Humans?
How Do We Know Climates Changed?
How Do We Know These Are Different Species?
How Do We Know the Ages of These Fossils?
How Do We Know These Are Human Fossils?
How Do We Know Climates Changed In The Past?
How Do We Know This Zebra Was Food?
How Do We Know Humans Evolved?
How Do We Know the Footprints Are Human?
How Do We Know Hadars Environment Changed?
How Do We Know Tools Were Transported?
How Do We Know These Were Hearths?
How Do We Know How Long It Took to Grow Up?
How Do We Know These Were Used as Pigments?
How Do We Know These Are Beads?"
How Do We Know? | The Smithsonian Institution's Human Origins Program
There is also
"Human Evolution Timeline Interactive
Explore the evidence for human evolution in this interactive timeline - climate change, species, and milestones in becoming human.
Zoom in using the magnifier on the bottom for a closer look!"
Human Evolution Timeline Interactive | The Smithsonian Institution's Human Origins Program