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 ("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.
Definition and scope
Under the ICZN, the type locality of a nominal species-group taxon (that is, a species or subspecies as formally named under the Code) is the geographical (and, where relevant, stratigraphical) place of capture, collection, or observation of the name-bearing type. If a species-group name was established on syntypes (multiple specimens that collectively served as the basis for the name, none of them singled out as a unique standard) and no lectotype has been designated, the type locality encompasses the localities of all syntypes. The definition therefore ties the concept directly to a specimen (or set of specimens) rather than to an author's abstract idea of "where the species lives", and it should not be read as describing a species' overall distribution or the centre of its range. A key edge-case provision addresses specimens that were transported by artificial means before being collected: the ICZN specifies that in such cases the type locality is the place from which the name-bearing type, or its wild progenitor, began its unnatural journey. This prevents accidental locations – such as a metropolitan zoo or a port of entry – from being erroneously designated as the type locality for a species that originated in the wild. For fossil taxa, type-locality usage is commonly treated as including the stratigraphical horizon associated with the name-bearing material, as well as its geographic origin.
In botany, the ICN governs the naming of algae, fungi, and plants and focuses primarily on the typification of names by specimens (or illustrations) rather than by geographical places. Locality information for the type is typically recorded in the protologue (everything published as part of the original description of the name, including text, illustrations, and specimen citations) and in herbarium label data, and it is often discussed in practice even where it is not regulated as a defined ICN term. Although the ICN does not formally define "type locality" as a regulated term, the collecting locality of the holotype or other original material is routinely referred to by botanists as the locus classicus and carries equivalent practical importance.
In prokaryote nomenclature, governed by the International Code of Nomenclature of Prokaryotes (ICNP), a species name is fixed by a living reference culture, the type strain (a particular isolate maintained in culture collections that serves as the permanent reference point for the name), rather than by a preserved specimen. For names validly published since 2001, the ICNP requires that a viable culture of the type strain be deposited in at least two publicly accessible culture collections in different countries, so that the reference material can be examined and obtained by other researchers. In this context, "type locality" is used mainly as provenance information for the type strain: many descriptions report where the type strain was isolated (often giving coordinates and habitat) and may label that site as the type locality, even though the Code's binding reference point is the strain itself. Related ideas such as collecting material "from the type locality" are therefore practical descriptors in microbiology rather than formal nomenclatural categories, and their interpretation can be less standardised than in specimen-based codes.
In virus taxonomy, overseen by the International Committee on Taxonomy of Viruses (ICTV), species are typically linked to an exemplar virus isolate represented by genome sequence data, rather than to a preserved name-bearing specimen. For new species, ICTV taxonomic proposals are expected to provide GenBank accession numbers for an exemplar isolate, and ICTV resources compile exemplar-linked information for each recognised species. In practice, some ICTV materials also refer to a single "type isolate" for a species, usually chosen as the best-sequenced or best-documented isolate, and the place and circumstances of isolation (often recorded in sequence databases as country/region and sometimes coordinates) provide the closest functional analogue to a "type locality". This locality information is contextual provenance for the exemplar or type isolate, however, rather than a formal, name-fixing concept comparable to type locality under specimen-based codes.
Relationship to name-bearing types
The type locality is derived from the identity of the name-bearing type and follows whichever specimen(s) the relevant code treats as the objective bearer of the name, rather than being an independently chosen geographical feature. It therefore does not necessarily correspond to "where the species really comes from" in a broader distributional sense, and it should not be read as a summary of a species' overall range or typical occurrence.
In the simplest zoological case, a single specimen was designated (or indicated) in the original description as the holotype, and its place of collection defines the type locality. When no holotype was designated and the original description was based on multiple specimens (syntypes), the type locality encompasses the localities of all those syntypes collectively, and this can include more than one geographic place (and, where relevant, more than one stratigraphical context) until a lectotype is selected from among them. Once a lectotype has been designated, the type locality is fixed to the place of origin of that lectotype, because the lectotype then functions as the name-bearing type for the nominal taxon.
Other specimens cited in the original description but not forming part of the name-bearing type – paratypes in zoological terminology – do not determine the type locality. They often share locality context with the holotype and can be useful for understanding the original author's concept of the species, but they have no nomenclatural bearing on which place is formally the type locality. Where a holotype was designated, the ICZN treats the remaining specimens of the type series (the full set of specimens on which the original author based the new species) as paratypes and specifies that they do not become syntypes and cannot be used for lectotype selection if the holotype is lost or destroyed, although they may still be considered in any later neotype action taken under the Code's neotype provisions.
If the original name-bearing type material is lost or destroyed and a neotype is later designated to serve as the name-bearing type, the type locality is correspondingly tied to the place of origin of the neotype, because the ICZN defines type locality by direct reference to the name-bearing type. Specimens collected from the type locality ("topotypes" in common usage) can be valuable in later revisionary and comparative work, but they have no formal nomenclatural status unless one is designated as a name-bearing type under the relevant rules.
In botany, the type of a species name is typically a single herbarium specimen (the holotype) or, for older names published without a designated holotype, the set of original material (the specimens and illustrations that the original author associated with the name) from which a lectotype may later be chosen. The ICN uses the term isotype for a duplicate of the holotype (i.e. part of the same gathering), which by definition comes from the same locality. If a holotype is missing or destroyed, an isotype (as original material) may be selected as the lectotype, thereby fixing the application of the name to that specimen and its associated locality information in practice.
How type locality can change or be fixed later
Although the type locality is initially determined by the provenance of the original name-bearing type, subsequent nomenclatural acts can change it. The most consequential changes occur when the identity of the name-bearing type is later fixed by a lectotype or neotype designation, because the ICZN then assigns the type locality to the place of origin of that later-fixed name-bearing type. Older original descriptions may also give vague, broad, or historically framed locality statements, and later authors may try to make these interpretable as an actual place that can be located and revisited.
Clarifying or correcting a stated type locality
The ICZN recommends that an erroneous statement of type locality should be corrected. In ascertaining or clarifying a type locality, the Code points to evidence such as data accompanying the original material, collectors' notes or itineraries, and the original description, and it treats inference from localities within the known range of the taxon (or from which specimens referred to the taxon have been taken) as a last resort.
Lectotype fixes the type locality
When a nominal species was originally based on syntypes from two or more localities and no holotype was designated, a later author may select one of those syntypes as the lectotype. Under ICZN Article 76.2, the place of origin of the lectotype then becomes the type locality "despite any previously published statement of the type locality". This is why older taxonomic literature can appear to give a different type locality from the one currently accepted: the designation of a lectotype may have changed it since publication of the original description.
In botany, a lectotype is likewise selected from among the original material when no holotype exists or the holotype has been lost; ICN Article 9.3 provides that the selected element must not be in serious conflict with the protologue (the text and illustrations associated with the original publication of the name).
Neotype fixes the type locality