Vertebrates are chordates and one defining feature of this phylum is the presence of segmented muscle blocks.

Are vertebrates segmented?

Segmentation is the serial repetition of similar organs, tissues, cell types or body cavities along the anterior-posterior (A-P) axis of bilaterally symmetric animals (bilaterians). You, like other vertebrates, are segmented — consider the skeleton, musculature and nervous system of your trunk.

What animals have segmentation?

The arthropods, annelids, and chordates are universally considered segmented.