She is not suggesting they are from the same individual, since they are of different ages, but they seem to come from the same species, namely Homo rudolfensis.

ECONOMIST: Human ancestry has just got more complicated

It is too different from what this chain of reasoning suggests was the shape of Homo rudolfensis to be explained by sexual dimorphism, unless the sexes differed in this species in ways not seen in any other primate.

ECONOMIST: Human ancestry has just got more complicated

Others add a second, Homo rudolfensis.

ECONOMIST: Human ancestry has just got more complicated

One of the new specimens, known as KMN-ER 62000, has a face like the type specimen of Homo rudolfensis (the fossil that defines the species, if species it turns out to be), though it seems to be from an adolescent, whereas the type specimen is an adult.

ECONOMIST: Human ancestry has just got more complicated

It seems then that at least two, and possibly three species of Homo were stalking the east-African savannah a little under 2m years ago: habilis, rudolfensis and something as yet unnamed.

ECONOMIST: Human ancestry has just got more complicated