SUBPHYLUM

In life, 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,

★ Brachiopoda: divided into subphyla Linguliformea, Craniformea and Rhychonelliformea,

★ Chordata: divided into Urochordata, Cephalochordata and Vertebrata