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- Created 2012-04-01
, also known as "phyletic change", is the
of species involving an entire
rather than a branching event, as in
. When enough
s have occurred and become stable in a population so that it is significantly differentiated from an ancestral population, a new
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
. A series of such species is collectively known as an evolutionary
It is easy to see from the preceding definition how controversy can arise among taxonomists as to when the differences are significant enough to warrant a new species classification. Anagenesis may also be referred to as "gradual evolution".
The philosopher of science Marc Ereshefsky argues that
are the result of anagenesis. The lineage leading to birds has diverged significantly from lizards and crocodiles, allowing evolutionary taxonomists to classify birds separately from lizards and crocodiles, which are grouped as reptiles.
, it has been suggested that social anagenesis/aromorphosis be viewed as universal or widely diffused social innovation that raises social systems' complexity, adaptability, integrity, and interconnectedness.
from Wikipedia (last updated: 10 December), licensed under
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Diagram contrasting Anagenesis and Cladogenesis from the University of Newfoundland
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