noun, noun or participle which takes 'suru', intransitive verb
anagenesis
Biology term for evolutionary change within a single lineage without branching, leading to a gradual transformation of a species. Contrasts with 分岐進化 (cladogenesis).
See also: 分岐進化
Anagenesis is a mode of evolution in which form gradually changes within a single lineage.
この化石記録は、その種が分岐せずに向上進化したことを示している。
This fossil record shows that the species underwent anagenesis without branching.