biosystematics,
biosystematy use of data (e.g. cytogenetic or biochemical) to assess taxonomic relations especially within an evolutionary framework
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Wiktionary
Substantiv
systematics -
The science of systematicclassification, especially of organisms. Depending on context this may be the same as taxonomy or distinct. In the latter case systematics will be taken to mean the research into the relationships of organisms, while taxonomy will involve itself in the recognition and the naming of taxa.
Wikipedia
Biological systematics is the study of the diversification of life on the planet Earth, both past and present, and the relationships among living things through time. Relationships are visualized as evolutionary trees. Phylogenies have two components, branching order (showing group relationships) and branch length (showing amount of evolution).