Here is a list of Prehistoric Record Holders.
01. Weirdest Mouth
Sharks have been around the earth for at least 400 million years and have survived a lot of extinctions in one form or the other. Helicoprion survived the biggest mass extinction in history (Permian–Triassic extinction event). Up until 2013, the only known fossils of this genus on record were their teeth, which were arranged in a “tooth-whorl” strongly reminiscent of a circular saw.It was not until the discovery of the skull of a related genus of eugeneodont, Ornithoprion, that it was realized that the tooth-whorl was in the lower jaw. The tooth-whorl represented all of the teeth produced by that individual in the lower jaw, in that as the individual grew, with the older, smaller teeth being moved into the center of the whorl by the appearance of larger, newer teeth.Fossils have been found in the Ural Mountains, Wandagee Mountain of Western Australia, China, and Western North America, including the Canadian Arctic, Mexico, Idaho, Nevada, Wyoming, Texas, Utah, and California.
02 Biggest Nopes
A little armoured puppy with pincers and a stinger the size of a lightbulb. Jaekelopterus was the size of a crocodile with an appetite to match. It ravaged anything that stood in its wake. Other sea scorpions, ancient fish, ammonites, anything was on the dinner menu. It was also one of the largest sea scorpions in existence.
Perhaps one of the more well-known nopes in history, Arthropleura was basically a giant millipede the size of a car. It scuttled around ancient Carboniferous forests eating rotting plant matter. It was vegetarian, mostly.
03 Biggest Snake
Snakes these days usually are pretty small. The largest, by mass, is the green anaconda. The longest is the reticulated python. Titanoboa would have eaten them as a snack. Measuring over 12 meters in length, it was the size of T. Rex and its diet usually consisted of giant crocodiles and turtles that shared its territory. Thankfully for Tyrannosaurus, Titanoboa lived right after the dinosaurs’ extinction, ruling the earth just as the dinosaurs did before it.
04 Largest Penguin
Once found in New Zealand 45 million years ago, the giant penguin known as Anthropornis grew to heights of 1.7 meters (5 ft, 7 inches). In comparison, the largest penguins today, the emperor penguin, are only 1.2 meters (3 ft, 11 inches) tall.
05 Smallest Pterosaur
Generally thought of as massive flying reptiles, pterosaurs did come in all shapes and sizes. The smallest pterosaur is Nemicolopterus which lived in China some 120 million years ago. Its wingspan is less than 30 cm across (1 ft).
06 Largest Terrestrial Animal
Amphicoelias fragillimus is estimated to have been the largest terrestrial animal to have ever lived, at almost 60 meters in length (196 ft) and weighing in at 135 short tons. However, its fossils were lost and paleontologists today can only guess upon the drawings made of the original bones.
07 Largest Terrestrial Carnivore
The largest terrestrial predator to have ever lived was the bastard child of a crocodile, an otter, a duck, and a sailboat. Growing up to 18 meters (60 ft), Spinosaurus would have used its massive size to take down large prehistoric fishes that lived in the waters of prehistoric Northern Africa. Spinosaurus is special because it is the only dinosaur known to have lived a semi-aquatic lifestyle.
08 Strongest Bite
Growing to about a meter in length (3 ft) and up to 22 pounds, this Megapiranha paranensis terrorized South America 10 million years ago with bite forces of up to 4,750 newtons (1, 070 pounds)! Pound for pound, it is the strongest bite in prehistory, even outmatching larger predators like T. rex and Carcharodon megalodon.
09 Longest Dinosaur Name
Micropachycephalosaurus holds the title of the longest dinosaur name. It lived in China 69 million years ago. It is also one of the smallest dinosaurs to have been discovered, at around 1 meter in total length (3 ft).
10 Smartest Dinosaur
Troodon, a North American dinosaur, holds the record for the dinosaur with the largest brain to body ratio. It was around 2 meters in length (6 ft), and had slashing claws like Velociraptor and Deinonychus.