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Keywords:

  • hominid;
  • paleobiology;
  • Middle Awash;
  • systematics;
  • evolution

Evolutionary biologists created a large twentieth-century literature about delimiting biological species. Paleontologists contributed the unique complications of deep time. Toward century's end, one participant wrote: “In all probability more paper has been consumed on the questions of the nature and definition of the species than any other subject in evolutionary and systematic biology.”[1]