Class

Definition

A class is a taxonomic rank used in the biological classification of organisms. It falls between phylum and order in the hierarchy.

5 Must Know Facts For Your Next Test

1. Classes group together organisms that share a common set of characteristics.
2. The rank of class is more specific than phylum but broader than order.
3. In botanical taxonomy, the term 'class' can also refer to subdivisions within plant groups.
4. Classes are often divided into multiple orders based on additional distinguishing features.
5. Examples of classes include Mammalia (mammals) and Insecta (insects).

Review Questions

• What taxonomic rank falls between phylum and order?
• Name an example of a class in biological classification.
• How do classes relate to orders in taxonomy?

Related terms

Phylum: one of the major taxonomic ranks below kingdom and above class, grouping together organisms with a similar body plan or significant traits

Order: a taxonomic rank below class and above family, used to categorize organisms that share several closely related characteristics

Taxonomy: the scientific practice of classifying organisms into hierarchical categories based on shared traits and genetic relationships