Synapomorphies:
1.) In-turned Femoral Head
2.) Opposable Thumb
3.) Preforate Acetabulum

Synapomorphies:
1.) Long Cervical Vertebrae
2.) Long hand with digit II the longest
3.) Large claw on thumb (digit 1)

Synapomorphies:
1.) Armor made of bony scutes that cover back and/or flanks
2.) Tibia shorter than femur

Synapomorphies:
1.) The anterior portion of the illium is much longer than the posterior portion

Synapomorphies:
1.) Teeth inset from margin of jaws

(indicating the prescense of muscular cheeks)

Synapomorphies:
1.) Assymetrical distribution of teeth enamel

Synapomorphies:
1.) Expanded shelf at back of skull

Synapomorphies:
1.)The articulation of the skull and jaw is well below the level of the tooth row

Synapomorphies:
1.) Skull roof greatly thickened to form solid "dome" that is usually surrounded by various bumps and tubercles.
2.) Occipital plate rotated beneath skull

Synapomorphies:
1.) Rostral bone present on upper jaw to form sharp beak

Synapomorphies:
1.) Blunt teeth
2.) Very tiny head, suspended from long neck
3.) Tibia shorter than femur

Synapomorphies:
1.) Nares shifted to dorsal surface of skill

Synapomorphies:
1.) Kinetic, flexible jaw
2.) Deep ball-in-socket joint between head and neck
3.) Five or more sacral vertebrae

Synapomorphies:
1.) Ischium and pubis fuse with ilium in adults

Synapomorphies:
1.) Tooth row positioned entirely in front of orbit
2.) Maxillary fenestra present
3.) Distal 1/2 of tail staff and lacks haemal arches

Synapomorphies:
1.) Distal 3/4 of tail stiff
2.) Forelimb is at least 3/4 of presacral vertebral column

Synapomorphies:
1.) Solid bony sternum present

Synapomorphies:
1.) Greatly enlarged brain
2.) feathers

Synapomorphies:
1.) Antorbital fossa expanded upwardly

Synapomorphies:
1.) Metatarsal III tapers to a thin wedge as it approaches the ankle joint
2.) Metatarsals are long, slender and deep

Synapomorphies:
1.) Huge sickle shaped claw on digit II of foot
2.) Distal 80% of tail with extremely long processes of neural and haemel arches

Synapomorphies:
1.) Ossified sternum with large mid-line keel
2.) Fibula shortened-does not reach distal tibula

Synapomorphies:
1.) Scutes from interlocking mosaic that covers most of the body

Synapomorphies:
1.)Scutes enlarged to form two rows of large plates extending along vertebral column

Synapomorphies:
1.) Phalanges of Digit II of hand lost

Synapomorphies:
1.) Loss of teeth and development of beak
2.) All three metacarpals long and roughly equal in length, making the hand very slender

Synapomorphies:
1.) Clavicals unfused