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| This group included dinosaurs of both long-necked and short-necked varieties that were highly aquatic. They had heavy rigid trunks and rowed through the water with oar like fins. |
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| This group contains most of the living species of snakes. They have lost all traces of the pelvic girdle, and they have a highly kinetic skull. They have a single carotid artery and may be venomous. |
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| Most animals in this group had a frill over the neck and a parrot like beak. The teeth formed by a series of knife like edges that sheared vegations into short pieces. Some had nasal and brow horns for weapons. |
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| This group consisted of extremely heavy plant eating terrestrial dinosaurs with long flexible necks. The vertebrae were massive and ligaments equalized stress on the vertebrae. They walked like elephants. |
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| This major group within Lepidosauria is the sister group of lizards and snakes, and it includes the Tuatara. These animals are nocturnal, and feed primarily on invertebreats but sometimes birds. |
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| These animals were known as "opposite birds" because the metatarsals are fused differently than those of modern birds. Although this is a separate lineage from modern birds, they lacked teeth. |
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| This heavily armored dinosaurs were quadrupeds with short legs and broad bodies. They had bones embedded in their skin and some had lumps of bone at the end of their tails. Odor detection was good. |
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| These were highly specialized dinosaurs that superficially resemble porpoises. They gave birth to live young. They had large eyes, large heads with pointed jaws and sharp teeth. |
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| This grpup that gave rise to the crocodile was distinguished by the presence of an antorbital fenestra. The orbit of the eye was triangular, the stance was often bidpedal, and a strong muscle connected led to tail. |
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| This major lineage of turtles retracted the head with vertical flexion of the neck vertebrae. Specialized condyls permit vertical rotation. |
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| These animals had an enormous bony dome that thickened the roof of the skull. They may have used this dome for intraspecific combat or for defense. The body had to be modified to support the extra weight. |
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| This group within Lepidosauria includes both lizards and snakes. They have a determinate growth and two major lineages: iguania and scleroglossa. |
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| These were derived ornithopods that included the duck billed dinosaurs. They were large animals reaching 10 meters in length. Their heads were found in both crested and non crested forms |
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| Most animals in this Lepdiosaur group are legless with rigid skulls that allow them to tunnel through the ground. They have an upper median tooth that fits between the teeth of the lower jaw to take large bites. |
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| This is the earliest known Diapsid. It was a relatively small, agile, terrestrial animal that fed on large insects. It had large eyes, a long neck, and long legs,. It was probably no more than 70 cm long. |
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| This major lineage of turtles uses a sideways bend of the neck vertbrae to retract the head. Lateral bending of the neck is accomplished by ball and socket or cylindrical joint of the cervical vertebrae. |
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| These were flightless, foot propelled divers that were probably not able to walk on land because the feet were placed far posteriorly on the body. The body and neck were elongated, and they lacked a keel. |
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