In biology, a subphylum is a taxonomic rank intermediate between phylum and superclass. The rank of subdivision in plants and fungi is equivalent to subphylum.
Not all phyla are divided into subphyla. Those that are include:
- Arthropoda: divided into subphyla Trilobitomorpha, Chelicerata, Myriapoda, Hexapoda and Crustacea,
- Branchiopoda: divided into subphyla Linguiliformea, Craniformea and Rhychonelliformea,
- Chordata: divided into Urochordata, Cephalochordata and Vertebrata.