anagenesis

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an·a·gen·e·sis

 (ăn′ə-jĕn′ĭ-sĭs)
n.
An evolutionary process that involves change from an ancestor species to a descendant species without the branching or splitting off of new taxa.

anagenesis

(ˌænəˈdʒɛnɪsɪs)
n
the progressive evolutionary changes that take place over time in a single genetic lineage
References in periodicals archive ?
Maybe, from an anagenetic perspective, this stock might represent a link between the last Telothyris species and the earliest records of Stroudithyris, but more accurate systematic analysis is required, including some comparable records from different areas and basins.
Species known from the human fossil record are believed to have originated from ancestral forms primarily via lineage splitting, but also via anagenetic change (e.
Restricting consideration of the genetic underpinnings of adaptation to "complex" features would seem to arbitrarily exclude a large portion of the variation involved in anagenetic evolution.
For top-down changes a mechanism may be the emergence of a new higher level of the hierarchy, the anagenetic moment.