Reimagining Humanity

As the science of paleoanthropology developed, human evolutionary trees changed as much as the minds that constructed them.

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PALGRAVE MACMILLAN TRADE, JUNE 2015Before the mid-1900s, human fossils were for the most part studied and pronounced upon by specialists in human anatomy. Based in medical schools, these researchers were exquisitely attuned to variation within Homo sapiens, but were largely unconcerned with the riotous diversity of species out there in the living world. Ignorant of taxonomic norms, they branded newly discovered hominin fossils with new Latin names, much as they gave each of their children a separate name. In this way, throughout the first half of the 20th century the rapidly expanding paleoanthropological literature became littered with formal names—even though many of the freshly unearthed fossils actually belonged to species that had already been described.

I write about this crucible of discovery and folly in my new book, The Strange Case of the Rickety Cossack.

The haphazard application of species names to every new hominin fossil was a practice that could not continue indefinitely. And in 1950 the ornithologist Ernst Mayr, one of the fathers of the Evolutionary Synthesis, took it upon himself to lecture the paleoanthropologists on the error of their ways. The Synthesis was an elaboration of evolutionary theory that saw most evolutionary change as the gradual accumulation, via natural selection, of small genetic innovations within ancestor-descendant sequences. So Mayr depicted human evolution as the slow modification of a single lineage culminating in Homo sapiens. Among the fifteen hominin genera then described, Mayr said, there was in reality ...

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