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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 its largest subphylum Vertebrata.
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