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Scientific names and taxonomy

Scientific names provide traceable labels under formal nomenclatural codes, while taxonomy evaluates how organisms are delimited and classified. A name can remain validly published yet become a synonym when experts adopt a different name or species concept.

Scope: A practical overview of species names and taxonomic classification; accepted names and classifications can differ among authorities and change with evidence · Last updated 2026-07-16

Image: Assorted Coleoptera in the University of Texas Insect Collection cropped by Insects Unlocked, University of Texas at Austin · CC0

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Separate nomenclature from taxonomy

Nomenclature supplies rules for forming, publishing, and prioritizing names; taxonomy identifies, describes, delimits, and classifies organisms. International codes differ for animals, plants and fungi, prokaryotes, and viruses. Following the rules makes a name available or valid under a code, but does not force every expert to accept the same taxonomic concept. [1][4]

A field botanist examining the leaves and fruit of a shrub outdoors. — Field frame · Editorial contextA contextual view from Using a dichotomous key.Image: BLM Botanist Plants New Tree of Knowledge at Little Big Horn College (20656223462) by Brad Purdy / Bureau of Land Management · Public domain

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Read the binomial carefully

In a binomial, the first word names the genus and the second is the specific epithet; the combination denotes the species. The genus begins with a capital letter, the epithet does not, and both are normally italicized. An author name and year may follow in formal work, and parentheses can carry a precise nomenclatural meaning. [1][5]

Two juvenile California condors standing together on a rocky ledge. — Field frame · Editorial contextA contextual view from How to read the IUCN Red List.Image: David Clendenen / USFWS · Public domain

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Expect accepted names and synonyms

The same organism may have been described more than once, or later evidence may move a species to another genus. A checklist can mark one usage as accepted and link others as synonyms, misapplied names, or unresolved records. Search both the observed label and its accepted counterpart when joining historical and current observations. [2][3][6]

Close dorsal view of a spotted lanternfly with patterned folded wings. — Field frame · Editorial contextA contextual view from Native, introduced, and invasive.Image: USGS Bee Inventory and Monitoring Lab · Public domain

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Cite the authority and version

A name without its taxonomic source can hide important disagreements. Record the checklist or database, access or release date, accepted name, identifier when available, and the original name exactly as encountered. Stable identifiers can help track concepts across updates, but they do not erase uncertainty about species boundaries or classification. [1][2][3][6]

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Where this guide comes from

Source-checked editorial guide. Last updated 2026-07-16. This guide teaches identification and field skills; it is not a substitute for expert verification when it matters.