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Members of subphylum Vertebrata have the protective brain structure known as the cranium, which surrounds the brain, jaw, and facial bones.
Members of subphylum Vertebrata (Craniata) possess a cranium, which is a bony, cartilaginous, or fibrous structure that surrounds the brain, jaw, and facial bones.
This structure is present in all vertebrates and distinguishes them from invertebrate chordates.
For example, hagfishes (Myxini) have a cranium but lack a backbone, making them part of the clade Craniata.
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