From a modern chimp??????!!!!!!
Note that the next thing, A. africanus, over from the modern chimp looks a lot like the chimp, and it's the oldest skull in the series at 2.6 million years.
The text immediately preceding the figure:
One of the most celebrated examples of transitional fossils is our collection of fossil hominids (see Figure 1.4.4 below). Based upon the consensus of numerous phylogenetic analyses, Pan troglodytes (the chimpanzee) is the closest living relative of humans. Thus, we expect that organisms lived in the past which were intermediate in morphology between humans and chimpanzees. Over the past century, many spectacular paleontological finds have identified such transitional hominid fossils.From a source which should be familiar to you by now, and yet every thread is like your first thread.