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anagenesis
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Figure 3: Amount of change in the evolutionary history of three living species (C, D, and E), inferred by comparing amino-acid differences in their myoglobin molecules.
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anagenesis

biology
Also known as: phyletic speciation, vertical speciation
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Figure 3: Amount of change in the evolutionary history of three living species (C, D, and E), inferred by comparing amino-acid differences in their myoglobin molecules.
Figure 3: Amount of change in the evolutionary history of three living species (C, D, and E), inferred by comparing amino-acid differences in their myoglobin molecules.

Anagenesis is a type of evolutionary change where one taxon replaces another within a single lineage, without branching. This contrasts with cladogenesis, where a lineage splits into two or more separate lines. Anagenetic evolution has been observed in the increase of the human cranium size over two million years and the reduction of toes in the horse lineage. Evolutionary trees can illustrate both anagenesis and cladogenesis, showing changes within lineages and branching relationships.123

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5 Britannica Sources
  1. anagenesis
  2. evolution - Evolution within a lineage and by lineage splitting
  3. evolution - Maximum parsimony methods
  4. evolution - Quantum speciation
  5. evolution - A model of speciation

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