Taxonomic hierarchy

Home > Biology > Taxonomy (biology) > Taxonomic hierarchy

The classification of organisms into groups based on shared characteristics.

Species: A basic unit of taxonomy, refers to a group of organisms that share similar physical characteristics and can interbreed to produce fertile offspring.
Genus: A taxonomic rank above species, refers to a group of closely related species that share a common ancestor.
Family: A taxonomic rank above genus, refers to a group of related genera that share common characteristics.
Order: A taxonomic rank above family, refers to a group of related families.
Class: A taxonomic rank above order, refers to a group of related orders that share certain structural or functional features.
Phylum: A taxonomic rank above class, refers to a group of related classes that share certain basic structural features.
Kingdom: A taxonomic rank above phylum, refers to a group of related phyla that share certain basic features such as cell structure, metabolism, and reproduction.
Domain: A taxonomic rank above kingdom, refers to a group of related kingdoms that share certain basic features of cell structure and biochemistry.
Binomial nomenclature: A system of naming species using a unique two-part scientific name consisting of the genus and species names.
Taxonomic keys: Tools used to identify organisms based on a series of choices that lead to the correct identification.
Phylogenetics: The study of evolutionary relationships among species, based on genetic, morphological, and fossil evidence.
Cladistics: A method of classifying organisms based on shared evolutionary history or ancestry.
Taxonomic classification: The process of assigning organisms to the appropriate taxonomic rank based on their characteristics and evolutionary relationships.
Taxonomic revisions: The process of reclassifying or reorganizing groups of organisms based on new evidence or changes in understanding.
Taxonomic diversity: The range of different groups of organisms that exist and their relationships to one another.
Taxonomic hierarchy: The order and arrangement of taxonomic ranks from the lowest (species) to the highest (domain).
Phylogenetic trees: Diagrams that depict evolutionary relationships between groups of organisms, based on genetic or morphological data.
Taxonomic databases: Digital repositories of taxonomic information, including descriptions, distributions, and classifications of organisms.
Taxonomic nomenclature: The set of rules and conventions used to name and classify organisms in a standardized way.
Taxonomic challenges: The issues and controversies that arise in the process of classifying and naming organisms, including disagreements over relationships, classification criteria, and naming conventions.
Domain: The highest level of taxonomic classification that groups organisms into three domains: Archaea, Bacteria, and Eukarya, based on differences in cell structure and biochemistry.
Kingdom: The second level of classification that groups organisms based on shared characteristics such as cell structure, nutrition, and mode of reproduction.
Phylum or Division: A taxonomic rank below kingdom that groups organisms with similar body plans, tissues, and organ systems.
Class: A taxonomic rank below phylum/division that groups organisms based on shared characteristics such as body structure, locomotion, and feeding habits.
Order: A taxonomic rank below class that groups organisms based on shared characteristics such as body form, methods of reproduction, and other physical traits.
Family: A taxonomic rank below order that groups organisms based on shared anatomical and physiological traits, such as body size, limb structure, and reproductive systems.
Genus: A taxonomic rank below family that groups organisms based on their physical and genetic similarities, typically including morphology, anatomy, and DNA sequences.
Species: The most specific taxonomic rank that groups organisms based on shared traits, behavior, and genetic makeup. A species is defined as a group of individuals that can successfully interbreed and produce viable offspring.
Subspecies: A taxonomic rank below species that groups organisms with slightly different physical or genetic traits. Subspecies are usually geographically isolated from each other and may have distinct adaptations to their local environment.
Variety: A taxonomic rank below subspecies that groups organisms with minor morphological or genetic differences that do not warrant subspecies designation. Varieties are typically distinguished by differences in color, size, or other physical characteristics.
"Taxonomy is the practice and science of categorization or classification."
"A taxonomy (or taxonomical classification) is a scheme of classification, especially a hierarchical classification, in which things are organized into groups or types."
"A taxonomy can be used to organize and index knowledge (stored as documents, articles, videos, etc.), such as in the form of a library classification system, or a search engine taxonomy, so that users can more easily find the information they are searching for."
"A taxonomy can be used to organize and index knowledge (stored as documents, articles, videos, etc.), such as in the form of a library classification system, or a search engine taxonomy, so that users can more easily find the information they are searching for."
"Many taxonomies are hierarchies (and thus, have an intrinsic tree structure), but not all are."
"Originally, taxonomy referred only to the categorisation of organisms or a particular categorisation of organisms."
"In a wider, more general sense, it may refer to a categorisation of things or concepts, as well as to the principles underlying such a categorisation."
"Taxonomy organizes taxonomic units known as 'taxa' (singular 'taxon')."
"Taxonomy is different from meronomy, which deals with the categorisation of parts of a whole."
"A taxonomy (or taxonomical classification) is a scheme of classification, especially a hierarchical classification, in which things are organized into groups or types."
"...so that users can more easily find the information they are searching for."
"A taxonomy can be used to organize and index knowledge (stored as documents, articles, videos, etc.)"
"Many taxonomies are hierarchies (and thus, have an intrinsic tree structure)."
"Originally, taxonomy referred only to the categorisation of organisms or a particular categorisation of organisms."
"In a wider, more general sense, it may refer to a categorisation of things or concepts, as well as to the principles underlying such a categorisation."
"Taxonomy organizes taxonomic units known as 'taxa' (singular 'taxon')."
"Taxonomy is different from meronomy, which deals with the categorisation of parts of a whole."
"A taxonomy can be used to organize and index knowledge (stored as documents, articles, videos, etc.), such as in the form of a library classification system, or a search engine taxonomy, so that users can more easily find the information they are searching for."
"Many taxonomies are hierarchies (and thus, have an intrinsic tree structure), but not all are."
"In a wider, more general sense, it may refer to a categorisation of things or concepts, as well as to the principles underlying such a categorisation."