Genus

Definition

A genus is a taxonomic rank used in the biological classification of living and fossil organisms, grouping species that share common characteristics. It ranks above species and below family.

5 Must Know Facts For Your Next Test

1. A genus contains one or more species that are closely related.
2. The name of a genus is always capitalized and italicized when written.
3. Genus names are often derived from Latin or Greek and may describe a characteristic feature of the organisms.
4. In binomial nomenclature, the genus name is used as the first part of the scientific name of an organism (e.g., Homo sapiens).
5. The concept of genus was introduced by Carl Linnaeus in his system of taxonomy.

Review Questions

• What taxonomic rank comes directly above genus?
• How is a genus name properly formatted in scientific writing?
• Who introduced the concept of genus in taxonomy?

Related terms

Species:

The basic unit of biological classification, representing individuals that can interbreed and produce fertile offspring.

Family:

A higher taxonomic rank than genus, grouping multiple genera that share common traits.

Binomial Nomenclature: The system of naming species using two terms, where the first term is the genus and the second is the specific epithet.