In taxonomy, an infraclass is a further subdivision of a biological subclass. For example:
- Phylum Arthropoda: Crustaceans and Chelicerates
- Subphylum: Crustacea
- Class: Maxillopoda
- Infraclass Cirripedia: Barnacles
This taxonomic description would then continue through order to a specific species.
An infraclass is often used where there is some debate whether a division should be a class in its own right.
