Tadpoles have a cartilaginous skeleton, thin nonglandular skin, and a long coiled intestine; they lack jaws, lungs, and eyelids.
If evidence from fossil and living forms is combined, the Agnatha are distinguishable from the other craniates (Gnathostomata) by what they lack: jaws, lateral fins supported by fin rays, vertebrae, a horizontal semicircular canal in the ear, and genital ducts.
That the fossil lobopodian Antennacanthopodia [ 20], for example, lacks jaws and claws, is most likely to be because they were never present.
Game Informer commented that Blue Dragon lacked "jaw dropping" moments and was missing a nebulous "key element" to make it perfect.
Scorpions lack conventional jaws, and their feeding habits are unusual.
Jawless vertebrates also lack hinged jaws, a mineralized skeleton, paired appendages, a pancreas, and spleen [ 25].
Edentulous patients with implant-supported dentures showed improved tactile discrimination ability and motor function in contrast to patients with complete dentures [42, 43] However, it is important to compare these results with those from patients with implant-supported prostheses in both jaws, lacking any kind of periodontal feedback.
Microgale macpheei is known from two specimens: a damaged cranium (skull without mandibles, or lower jaws) lacking the back part (the parietal bones and further back) as well as the incisors, canines, and second premolars; and another damaged cranium lacking the same parts as well as the left toothrow.
Caenagnathids are not well known either but appear to have had rounded jaws that, lacking or bearing reduced teeth, are sometimes mistaken for the jaws of birds.
The skull also had strange cranial crests, and the jaws lacked teeth but were probably sheathed with a horny, beaklike covering.
