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 ?
The findings contradict the idea of an anagenetic relation between both groups, through which a species disappears giving way to a new species in a lineal fashion.
This finding contradicts the long-held notion of an anagenetic relationship between these two taxa, instead supporting a branching pattern of evolution.
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.
Peripheral nerve injury is a common disease, the proliferation of glia and extraneural connective tissue in peripheral nerve defect may hinder the growth of anagenetic axon or misguide the growth cone of axon; thus, the anagenetic axon cannot reach the target organ or even results in the formation of neuroma at the nerve stumps [1]; therefore, the defect of nerve must be bridged by graft to induce the nerve regeneration.
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.g., Kimbel et al., 2006; Dunsworth, 2010; McNulty, 2010).