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The human genus.

B Wood1, M Collard

  • 1Department of Anthropology, George Washington University, 2110 G Street NW, Washington, DC 20052, USA. bwood@gwu.edu

Science (New York, N.Y.)
|April 2, 1999
PubMed
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Defining the human genus Homo is challenging. This study revises criteria for Homo classification, excluding Homo habilis and Homo rudolfensis, and identifying Homo ergaster as the earliest valid species.

Area of Science:

  • Paleoanthropology
  • Evolutionary Biology
  • Taxonomy

Background:

  • Incorporating evolutionary history and adaptation into biological taxonomy presents a general challenge.
  • Defining the human genus, Homo, exemplifies this taxonomic difficulty.

Purpose of the Study:

  • To review conventional criteria for allocating fossil species to the genus Homo.
  • To propose a revised definition for Homo based on verifiable criteria.
  • To re-evaluate the taxonomic status of fossil hominins within the genus Homo.

Main Methods:

  • Review of existing taxonomic criteria for the genus Homo.
  • Analysis of fossil evidence and evolutionary history.
  • Application of a revised, verifiable definition to fossil hominin species.

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Main Results:

  • Conventional criteria for Homo classification were found to be inappropriate or inoperable.
  • Homo habilis and Homo rudolfensis do not meet the revised criteria for inclusion in the genus Homo.
  • The earliest taxon meeting the revised criteria is Homo ergaster (early African Homo erectus), appearing around 1.9 million years ago.

Conclusions:

  • A revised, verifiable definition for the genus Homo is proposed.
  • The reclassification excludes Homo habilis and Homo rudolfensis from Homo.
  • Homo ergaster is identified as the earliest species within the redefined genus Homo, highlighting significant findings in human evolution.