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Stephen Jay Gould & Niles Eldredge. 1993. Punctuated equilibrium comes of age. Nature: 366: 223-227.

We have no evidence that the species of 'living fossil' groups are particularly old. For example, the western Atlantic horseshoe crab, Limulus polyphemus --the 'type example' of the phenomenon--has no fossil record at all, whereas the genus can only be traced to the Miocene [about 20 mya].

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Saltational theory - PowerPoint PPT Presentation

Stephen Jay Gould &amp; Niles Eldredge. 1993. Punctuated equilibrium comes of age. Nature: 366: 223-227.

Stephen Jay Gould & Niles Eldredge. 1993. Punctuated equilibrium comes of age. Nature: 366: 223-227.