Taxonomy

Definition

The science and practice of discovering, describing, naming, and classifying organisms into a hierarchical system based on shared characteristics, evolutionary relationships, or both. In entomology and arachnology, taxonomy encompasses the formal description of new species, the revision of existing classifications, and the application of nomenclatural rules to ensure each taxon has a single valid scientific name. Modern taxonomy integrates morphological, molecular, ecological, and behavioral data to infer phylogenetic relationships and stabilize classification schemes.

Etymology

From Greek taxis (arrangement, order) + nomos (law, custom), via French taxonomie.

Example

A taxonomist revising the genus _Lycosa_ might examine genitalic morphology and DNA sequences to determine which populations represent distinct species versus geographic variants, then publish a revised classification with new combinations and synonymies.

Synonyms

• Systematics
• biosystematics
• classification

Related Terms

• Systematics
• Nomenclature
• Phylogeny
• classification
• Binomial nomenclature
• Type specimen
• Holotype
• synonymy
• monophyly
• Cladistics
• Morphology
• DNA barcoding

Usage Notes

In contemporary usage, 'taxonomy' emphasizes the activities of naming and classifying, while 'systematics' more broadly encompasses the study of biological diversity and evolutionary relationships; the terms overlap considerably and are sometimes used interchangeably. Taxonomy is both descriptive (documenting diversity) and synthetic (organizing diversity into predictive hierarchies). In entomological practice, alpha taxonomy refers to the discovery and description of new species, while beta and gamma taxonomy address phylogenetic relationships and evolutionary patterns respectively.