What is Binomial Nomenclature?
Binomial nomenclature is the universal system for naming living organisms. Every species gets a unique two-part Latin name: the genus (a group of related species) followed by the specific epithet (identifying the particular species within that genus). For example, the Guanacaste tree is Enterolobium cyclocarpum.
How It Works
The Two Parts
- Genus: Capitalized — groups closely related species (e.g., Cedrela).
- Specific epithet: Lowercase — identifies the particular species (e.g., odorata).
Complete Citation
A full scientific name includes the authority — the scientist who first described the species:
- Cedrela odorata L. (Linnaeus described it)
- Dipteryx panamensis (Pittier) Record & Mell
Formatting Rules
- Always italicized (or underlined in handwriting).
- Genus may be abbreviated after first use: C. odorata.
- Authority not italicized.
Why Not Just Use Common Names?
Common names are ambiguous:
- "Cedro" can refer to completely different trees in different countries.
- One tree may have dozens of common names across regions.
- Scientific names are universal — they work in any language.
Costa Rican Examples
| Common Name | Scientific Name | Meaning | | ---------------- | -------------------------- | ----------------------- | | Guanacaste | Enterolobium cyclocarpum | Round-fruited intestine | | Corteza Amarilla | Handroanthus ochraceus | Yellow Handroanthus | | Cocobolo | Dalbergia retusa | Notched Dalbergia |
Why It Matters
- Precision: Eliminates confusion caused by regional common names.
- Research: Enables scientists worldwide to communicate about the same organism.
- Conservation: CITES protections and IUCN listings are based on scientific names.