Within a population at any one time there is a complex pedigree or network of the ancestry of genes that describes who received what genes from whom. Among populations of a species there is a tree indicating which populations diverged from others and the sequence of branching events of population separation. At the species level, there is another tree of relationships that describes the sequence of branching events that led to the formation of descendant from ancestral species. Identification is not classification . Identification is to place an individual into an already existing classification scheme.
Classification is to assemble groups into larger groups.
A systematic solution to the problem of diversity incorporates both of these goals, but this result is not always easily obtained. In Aristotle's time things were either animals or plants. Linnaeus believed in the reality of the genus. Homo sapiens, etc. This methodology gave way to Upward classification by empirical grouping.