Type locality (biology)

A type locality is the place where the name-bearing type specimen – the particular specimen that formally anchors the scientific name – of a species or subspecies was collected, captured, or first observed. In zoology, the term is formally defined by the International Code of Zoological Nomenclature (ICZN), which ties the type locality directly to the provenance of the name-bearing type rather than to the species' overall distribution. In botany (including algae and fungi), the collecting place of the type is usually discussed as the locus classicus ("classical locality"), even though the International Code of Nomenclature for algae, fungi, and plants (ICN) regulates typification by specimens rather than defining "type locality" as a standalone term.

A type locality can be effectively changed when a later author selects a single specimen from the original set as the lectotype, or designates a replacement specimen (a neotype) when all original material has been lost, because the Code then ties the type locality to the provenance of that newly fixed specimen. Disagreements may arise when later authors "restrict" vague historical localities without a formal typification act. Because many older localities were recorded only as narrative descriptions, modern practice often involves georeferencing: assigning coordinates and an explicit uncertainty estimate, and documenting how that interpretation was made. In biodiversity informatics, type-locality data are typically expressed through standard specimen and location fields (for example in Darwin Core) rather than through a single "type locality" field, and the concept is used in applied work ranging from taxonomic revision and DNA sequencing of topotypic material (specimens collected from the type locality) to discussions of conservation significance for sites where endemic species were first documented.