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Lewisuchus admixtus is an  archosaur  relative of dinosaurs related to Marasuchus and Pseudolagosuchus. It comes from the late  Triassic  Los Chanares fauna of La Rioja, Argentina. Of the original material assigned to this animal, the  astragalus  and  pes  belong to a smaller proterochampsid, and the  femur  belongs to Lagosuchus. The braincase, partial  mandible ,  maxilla  with teeth and  postcrania  remain as Lewisuchus, which may trun out to be the same as Pseudolagosuchus.
Albertosaurus was a relative of Tyrannosaurus rex; Albertosaurus was smaller than T. rex and lived a few million years earlier. Albertosaurus walked on two legs and had a large head with sharp, saw-toothed teeth. It had two-fingered hands on short arms. Its long tail provided balance and quick turning. It had powerful back legs with clawed, three-toed feet.

Albertosaurus was about 30 feet (9 m) long, about 11 feet (3.4 m) tall at the hips, and up to 3 tons in weight (averaging roughly 2500 kg). The lower jaw of Albertosaurus had from 14 and 16 teeth; the upper jaw had 17-19 teeth. It had one row of teeth in each jaw but had at least one replacement tooth growing up from under each tooth.
Allosaurus was a powerful predator that walked on two powerful legs, had a strong, S-shaped neck, and had vertebrae that were different from those of other dinosaurs (hence its name, the "different lizard"). It had a massive tail, a bulky body, and heavy bones. Its arms were short and had three-fingered hands with sharp claws that were up to 6 inches (15 cm) long.

Allosaurus was up to 38 feet long (12 m) and 16.5 feet tall (5 m). It weighed about 1400 kg. It had a 3 feet long (90 cm) skull with two short brow-horns and bony knobs and ridges above its eyes and on the top of the head. It had large, powerful jaws with long, sharp, serrated teeth 2 to 4 inches (5 to 10 cm) long.

Gastralia (hanging belly ribs) are thin, fragile ribs that helped support and protect the internal organs (like the lungs) in the middle area of the body. These ribs were not attached to the backbone; they were attached to the skin in the belly area.
Chasmosaurus was a rhinoceros-like dinosaur that was 16-26 feet (5-8 m) long and weighed about 3.5 tons (3220 kg). It had three short horns on its face along with a large bony plate projecting from the back of its skull (a frill). One short, wide horn was on its snout above its parrot-like beak and two backwards-facing brow horns were above its eyes. It had a large skull, four sturdy legs with hoof-like claws, a bulky body and a short, pointed tail. Chasmosaurus hatched from eggs. Its femur (thigh bone) was 75 cm long.

Fossilized Chasmosaurus skin has been found. The skin had knob-like bumps that had 5 or 6 sides.