anagenesis
Dictionary:
an·a·gen·e·sis (ăn'ə-jĕn'ĭ-sĭs) 
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n.
A pattern of evolution that results in linear descent with no branching or splitting of the population.
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anagenesis |
What is anagenesis?
When a species gradually changes over time to the extent that it
becomes a "new" species but does not give rise to additional species (no
divergence), this is described as anagenesis.
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Wikipedia:
Anagenesis |
- "Phyletic evolution" redirects here. You may be looking for phyletic gradualism.
Anagenesis, also known as "phyletic change," is the evolution of species involving an entire population rather than a branching event, as in cladogenesis. When enough mutations reach fixation in a population to significantly differentiate from an ancestral population, a new species name may be assigned. A key point is that the entire population is different from the ancestral population such that the ancestral population can be considered extinct.
It is easy to see from the preceding definition how controversy can arise among taxonomists when the differences are significant enough to warrant a new species classification. Anagenesis may also be referred to as "gradual evolution".
As regards social evolution, it has been suggested to view social anagenesis/aromorphosis as a universal / widely diffused social innovation that raises social systems' complexity, adaptability, integrity, and interconnectedness.[1]
See also
Notes
- ^ Leonid Grinin & Andrey Korotayev. Social Macroevolution: Growth of the World System Integrity and a System of Phase Transitions. World Futures, Volume 65, Issue 7 October 2009 , pages 477 - 506; Aromorphoses in Biological аnd Social Evolution: Some General Rules for Biological and Social Forms of Macroevolution in Social Evolution & History (Vol. 8 No. 2, September 2009: 6-50).
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