taxonomy

Binomial system

A formal, standardized system for naming species, developed by Carl Linnaeus.

Genus Name

The first part of a binomial name, representing the genus to which the organism belongs, always capitalized.

Species Epithet

The second part of a binomial name, identifying the specific species within the genus, written in lowercase.

Italicization

Scientific names are printed in italics when typed, or underlined when handwritten.

Abbreviation of Genus

After stating the full species name once, the genus can be abbreviated to its initial capital letter followed by a period.

Taxonomic Hierarchy

A classification system from Domain to Species, showing the relationships between various biological groups.

Kingdom

A major taxonomic rank that groups life forms into large biological categories based on cellular organization.

Phylum

A taxonomic rank below Kingdom that groups organisms with a fundamental body plan.

Class

A rank below Phylum that groups orders sharing major physiological traits.

Order

A taxonomic rank below Class that consists of families with specific adaptive features.

Family

A rank below Order that groups closely related genera.

Importance of Binomial Nomenclature

Provides universal recognition, eliminates ambiguity, and reflects evolutionary relationships.

Example of a Binomial Name

Panthera leo for lion; demonstrates the structure of genus and species epithets.