Evolutionary change in a single lineage over time.

The evolutionary process whereby one species evolves into another without any splitting of the phylogenetic tree. See cladogenesis.

(Paleoanthropology) Evolutionary process involving the gradual accumulation of changes in ancestor-to-descendant lineages. (= phyletic evolution)

Process in evolution of the development of a new contruction type and main phylogenetic progress. Evolutionary change producing a single lineage in which one taxon replaces another without branching.

evolutionary change in a single lineage not associated with a speciation event.

Evolution within a lineage, usually expressed by morphological change, but not necessarily associated with a splitting event.

An evolutionary process: the act of one species evolving into another without a split in the phylogenetic tree.

evolutionary change of characteristics within a line without an increase in the number of groups

The process by which evolutionary change along a single lineage creates a new species without any splitting of the phylogenetic tree (see cladogenesis).

Anagenesis, also known as "phyletic change", is the progressive evolution of species involving a change in gene frequency in an entire population rather than a cladogenetic branching event. 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 so that the ancestral population can be considered extinct.