FTP, identify this sub-phylum, home to the classes Aves and Mammalia, named for its possession of a spinal column, which shares its name with the series of bones that make up that column, which come in cervical, thoracic, and lumbar types.
This taxon is referred to as "Craniata" when it is expanded to admit the hagfish, and classes contained in this taxon include Agnatha, the jawless fish. Other classes include cartilaginous and bony fishes, Chondricthyes and Osteicthyes. FTP, identify this sub-phylum, home to the classes Aves and Mammalia, named for its possession of a spinal column, which shares its name with the series of bones that make up that column, which come in cervical, thoracic, and lumbar types.
This taxon is referred to as "Craniata" when it is expanded to admit the hagfish, and classes contained in this taxon include Agnatha, the jawless fish.
{Vertebrate}s [or {Vertebrata}; prompt on {Chordata} if respondent buzzes on a clue about a class contained by this taxon]