Comment on "Ultrastructure reveals ancestral vertebrate pharyngeal skeleton in yunnanozoans"

Tian <em>et al</em>. (Research Articles, 8 July 2022, abm2708) hypothesized that yunnanozoans are stem-group vertebrates based on the so-called cellular cartilage, fibrillin microfibers, and subchordal rod at branchial arches of yunnanozoans. However, we negate the presence of cellular cartilage, fibrillin, and the phylogenetic proposal of vertebrates based on the ultrastructure and morphology of yunnanozoans of more than 8000 specimens.