anagenesis

This is called anagenesis: new species by older species changing.

The term for progressive evolution is anagenesis, though this does not necessarily include the idea of improvement.

Ereshefsky has argued that paraphyletic taxa are the result of anagenesis.

Evolution is of two types: anagenesis and cladogenesis.

This challenged the prevailing theory of the time, anagenesis, and led to the modern understanding of cladogenesis.

When evolution occurs in this mode, it is usually by the steady transformation of a whole species into a new one (through a process called anagenesis).

Daspletosaurus is usually considered to be closely related to Tyrannosaurus rex, or even a direct ancestor through anagenesis.

Catagenesis (biology) - Retrogressive evolution, as contrasted with anagenesis.

Most evolution "nine-tenths" occurs by the steady phyletic transformation of whole lineages (anagenesis).

We may distinguish between four different dimensional frame- works: autopoiesis, ontogeny, phylogeny, anagenesis.'"

The human female's refusal to mate indiscriminately is, of course, the second key to the incredibly rapid evolutionary anagenesis of the human species.

Such an evolutionary style, technically called anagenesis, would permit a ladder, a chain, or some similar metaphor of linearity to serve as a proper icon of change.

It was a term used in contrast to anagenesis, which in present usage denotes the evolution of a single population into a new form without branching lines of descent.

Cladogenesis is often contrasted with 'anagenesis', where gradual changes in an ancestral species lead to its eventual "replacement" by a novel form (i.e., there is no "splitting" of the phylogenetic tree).

Punctuated equilibrium is commonly contrasted against the theory of phyletic gradualism, which states that evolution generally occurs uniformly and by the steady and gradual transformation of whole lineages (called anagenesis).

Both anagenesis (gradual change in an entire population's gene frequency) and cladogenesis (a population "splitting" into two distinct evolutionary branches) occurred, and many species coexisted with "ancestor" species at various times.

In previous research Jack Horner speculated that a rise in sea level during the Bearpaw Transgression created selective pressure as coastal lowlands were swallowed up the sea, resulting in anagenesis.

The biologist Orator F. Cook seems to have been the first to coin the term 'speciation' for the splitting of lineages or "cladogenesis," as opposed to "anagenesis" or "phyletic evolution" occurring within lineages.

Gould was particularly attracted to Douglas J. Futuyma work on the importance of reproductive isolating mechanisms.Futuyma, Douglas (1987) "On the role of species in anagenesis" 'The American Naturalist' 130: 465-473.

In 1888, Gulick introduced new terms for two patterns of evolution that can be observed: the term monotypic evolution (previously called "transformation;" today "anagenesis") and the term "polytypic evolution" (previously called "diversification"; today "cladogenesis") - simultaneous processes, such as the multiplication of species, manifested by different populations and incipient species.