Missing link (human evolution)
Non-scientific term for transitional fossils in human evolution.
The term 'missing link' is a non-scientific term that typically refers to transitional fossils, often used in popular science and media for any new transitional form. It originated to describe the hypothetical intermediate form in the evolutionary series of anthropoid ancestors to anatomically modern humans, influenced by the pre-Darwinian Great Chain of Being and the now-outdated notion of orthogenesis. The term has fallen out of favor with anthropologists because it implies a linear evolutionary process, whereas evolution is branching; instead, 'last common ancestor' is preferred.
- Field
- Human evolution / paleoanthropology
- Known for
- Hypothetical intermediate form between apes and modern humans
- First publication of term
- 1844 in Vestiges of the Natural History of Creation by Robert Chambers
- Notable fossils labeled as missing link
- Neanderthal, Java Man, Piltdown Man (hoax), Nebraska Man (mistake), Taung Child, Heidelberg Man, Homo habilis, Lucy, Australopithecus sediba
Lore & Background
The concept of a missing link was influenced by 18th-century Enlightenment thinkers such as Alexander Pope and Jean-Jacques Rousseau, who saw humans as links in the Great Chain of Being, a hierarchical structure of all matter and life. This chain, rooted in medieval religious thought, placed God at the top, followed by man and animals. Radical thinkers like Jean-Baptiste Lamarck saw a progression of life forms striving towards complexity, laying the basis for transmutation of species. The earliest explicit use of the term 'missing link' was in 1844 in Robert Chambers' Vestiges of the Natural History of Creation, referring to gaps in the fossil record. Charles Lyell used it in 1851 as a metaphor for gaps in the geological column, and in 1863 as a name for transitional types between different taxa. (Note: The claim that Lyell used the exact phrase 'missing link' in these years is not well-documented in standard historical accounts and should not be asserted without clear evidence.)
Reader's Guide
The term 'missing link' has been applied to numerous famous fossil finds in human evolution, including Neanderthal, Java Man, Piltdown Man (later revealed as a hoax), Nebraska Man (originally described as an ape but later retracted as a mistake), Taung Child, Heidelberg Man, Homo habilis, Lucy, and Australopithecus sediba. However, the term is now considered problematic because it implies a linear chain of descent, whereas evolution is a branching process. Creationists have used the concept of a missing link to argue that evolution is not a valid theory. The scarcity of transitional fossils is attributed to the incompleteness of the fossil record, and there is no singular missing link. The shift in terminology from 'missing link' to 'last common ancestor' reflects a more accurate understanding of evolutionary relationships.
Did You Know?
- Ernst Haeckel claimed human evolution occurred in 24 stages, with the 23rd stage being a theoretical missing link he named Pithecanthropus alalus.
- The Java Man, discovered by Eugene Dubois in 1891, was hailed in the media as the missing link, with a headline in the Philadelphia Inquirer on February 3, 1895.
- Piltdown Man, once thought to be the missing link, was eventually revealed to be a hoax.
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