Natural Phenomena
Convergent Evolution
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Convergent evolution is the independent evolution of similar features in species from different lineages, producing analogous structures that were not present in their last common ancestor. Camera eyes evolved separately in vertebrates, cephalopods and jellyfish, flight evolved separately in birds, bats and pterosaurs, and Australian marsupials and Old World placental mammals converged on strikingly similar body forms after evolving in isolation.
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First DescribedThe concept predates the phrase: British anatomist Richard Owen distinguished analogous, similar-function but unrelated-origin, structures from homologous, shared-ancestry, ones in the 1840s, before Darwin published his theory of evolution. The specific term convergent evolution came into standard scientific use later, with sources disagreeing on exactly when. 2 PeriodicityNot periodic; accumulates over millions of years, e.g. roughly 110 to 119 million years for electroreception to arise independently in two fish lineages 1 ScaleMolecular traits up to entire body plans, across unrelated lineages facing similar ecological pressures 1 Cross-Tradition Connections
Demonstrated By
The whale's streamlined, fin-bearing body shape is a classic example of hydrodynamic convergence shared with unrelated fish and extinct marine reptiles adapted to the same open-ocean environment.
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