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.