Taxonomic revision

A taxonomic revision reassesses a group of organisms’ classification and names using evidence such as morphology, genetics, and evolutionary relationships. It may alter species boundaries, names, or the group’s placement.

Taxonomy: The science of identifying, naming, and classifying organisms. A revision is a focused reassessment within taxonomy.
Biological classification: The organization of organisms into named groups based on shared characteristics and relationships. Revisions alter the arrangement or membership of these groups.
Cryptic species: Distinct species that are difficult to distinguish by outward appearance. Genetic and other evidence can reveal species overlooked by older classifications.
Phylogenetic nomenclature: A system that defines taxon names by reference to evolutionary relationships and ancestry. It offers a different naming framework from revisions governed by rank-based codes.
Species delimitation: The process of deciding which populations or organisms constitute distinct species. Revisions often reconsider whether named populations represent separate species.
Binomial nomenclature: The system of naming species with a two-part genus and specific epithet. Species revisions commonly change one or both parts of a binomial.
Invasive species: A species introduced beyond its native range that spreads and causes harm. Revised identifications can change which organisms are tracked as invasive.
Reclassification of birds: Changes to bird classification informed by morphological and molecular evidence. Bird taxonomy illustrates how genetic evidence can reorganize established groups.
Phylogenetics: The study of evolutionary relationships among organisms using inherited characters and genetic evidence. Phylogenetic evidence can require rearranging a group’s classification.
International Code of Zoological Nomenclature: The rulebook governing the scientific names of animals. Animal revisions must apply its rules for availability and priority of names.

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