There are more two phylum in vertibrates
The seven sub-phylums of vertebrates are:
1. Class Agnatha (jawless fishes)
2. Class Chondrichthyes (cartilaginous fishes)
3. Class Osteichthyes (bony fishes)
4. Class Amphibia (amphibians)
5. Class Reptilia (reptiles)
6. Class Aves (birds)
7. Class Mammalia (mammals)
Refer link below for features of osteichthyes, amphibia, reptilia, aves, mammmals:
Agnatha is a superclass of jawless fish in the phylum Chordata, subphylum Vertebrata, consisting of both present (cyclostomes) and extinct (conodonts and ostracoderms) species. The group excludes all vertebrates with jaws, known as gnathostomes.
As the most primitive members of the vertebrates, agnathans differ from all others in several important respects. First, they lack hinged upper and lower jaws and instead have unhinged circular mouths. They also lack the paired appendages (fins or limbs) that are found in other vertebrates. In addition, the internal skeleton of agnathans is not bony but cartilaginous . However, many extinct agnathans had extensively developed bony plates directly under the skin. These were most often found in the region of the skull and served as a protective armor. Bony plates are not present in extant agnathan species.
Chondrichthyes is a class that contains the cartilaginous fishes: they are jawed vertebrates with paired fins, paired nares, scales, a heart with its chambers in series, and skeletons made of cartilage rather than bone.
Features: Chondrichthyes are exclusively marine fishes. They have cartilaginous endoskeleton. Their body is streamlined. Mouth is located on ventral side. Gill slits are separate and without gill cover (operculum). Pelvic fins bear claspers in males. Skin is tough and it has minute placoid scales. Animals are predatory. They have powerful jaws with teeth e.g., sharks, rays, skates etc.