  The discovery of Paranthropus deyiremeda in 3.3-3.5 million year old fossil
sites in Afar (Haile-Selassie, 2015), together with 30% of the gorilla genome
showing lineage sorting between humans and chimpanzees (Scally, 2012), and a
NUMT ("nuclear mitochondrial DNA segment") that is shared by both gorillas,
humans and chimpanzees, and that dates back to 6 million years ago (Popadin,
2017), is conclusive evidence that introgression from the gorilla lineage
caused the speciation of both the Australopithecus lineage and the Paranthropus
lineage, providing a lens into the gorilla-like features within Paranthropus,
as well as traits within Homo that originate from the gorilla branch, such as a
high opposable thumb index (Alm\'ecija, 2015), an adducted great toe (Tocheri,
2011, McHenry, 2006), and large deposits of subcutaneous fat.
