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Fish and marine organisms. When you name a new genus of prehistoric shark , it helps to come up with something memorable, and Diablodontus "devil tooth" certainly fits the bill.
However, you may be disappointed to learn that this late Permian shark only measured about four feet long, max, and looked like a guppy compared to later examples of the breed like Megalodon and Cretoxyrhina.
A close relative of the relatively unimaginatively named Hybodus , Diablodontus was distinguished by the paired spikes on its head, which likely served some sexual function and may, secondarily, have intimidated larger predators.
This shark was discovered in the Kaibab Formation of Arizona, which was submerged deep underwater million or so years ago when it was part of the supercontinent Laurasia.
Late Carboniferous million years ago. Up to 20 feet long and tons. Large size; continuously growing teeth.
As is the case with many prehistoric sharks, Edestus is known mainly by its teeth, which have persisted in the fossil record much more reliably than its soft, cartilaginous skeleton.
This late Carboniferous predator is represented by five species, the largest of which, Edestus giganteus , was about the size of a modern Great White Shark.
The most notable thing about Edestus, though, is that it continually grew but did not shed its teeth, so that old, worn-out rows of choppers protruded out from its mouth in an almost comical fashion--making it difficult to figure out exactly what kind of prey Edestus subsisted on, or even how it managed to bite and swallow!
Falcatus; pronounced fal-CAT-us. Shallow seas of North America. Early Carboniferous million years ago. About one feet long and one pound.
Small size; disproportionately large eyes. A close relative of Stethacanthus , which lived a few million years earlier, the tiny prehistoric shark Falcatus is known from numerous fossil remains from Missouri, dating from the Carboniferous period.
Besides its small size, this early shark was distinguished by its large eyes the better for hunting prey deep underwater and symmetrical tail, which hints that it was an accomplished swimmer.
Also, the abundant fossil evidence has revealed striking evidence of sexual dimorphism--Falcatus males had narrow, sickle-shaped spines jutting out of the tops of their heads, which presumably attracted females for mating purposes.
Some paleontologists think Helicoprion's bizarre tooth coil was used to grind away the shells of swallowed mollusks, while others perhaps influenced by the movie Alien believe this shark unfurled the coil explosively, spearing any unfortunate creatures in its path.
See an in-depth profile of Helicoprion. Hybodus was more solidly built than other prehistoric sharks. Part of the reason so many Hybodus fossils have been discovered is that this shark's cartilage was tough and calcified, which gave it a valuable edge in the struggle for undersea survival.
See an in-depth profile of Hybodus. Cretaceous million years ago. About seven feet long and pounds. Slender build; long, saw-like snout.
One of the most common fossil sharks of the Western Interior Sea--the shallow body of water that covered much of the western United States during the Cretaceous period--Ischyrhiza was an ancestor of modern saw-toothed sharks, though its front teeth were less securely attached to its snout which is why they're so widely available as collector's items.
Unlike most other sharks, ancient or modern, Ischyrhiza fed not on fish, but on the worms and crustaceans it rousted up from the sea floor with its long, toothed snout.
The foot-long, ton Megalodon was by far the biggest shark in history, a true apex predator that counted everything in the ocean as part of its ongoing dinner buffet--including whales, squids, fish, dolphins, and its fellow prehistoric sharks.
See 10 Facts About Megalodon. Shallow seas of Eurasia and North America. Devonian-Triassic million years ago. About 10 feet long and pounds.
Long, slender body; sharp spine jutting out from head. For a prehistoric shark that managed to persist for almost million years--from the early Devonian to the middle Permian period--not a whole lot is known about Orthacanthus other than its unique anatomy.
This early marine predator had a long, sleek, hydrodynamic body, with a dorsal top fin that ran almost the entire length of its back, as well as a strange, vertically oriented spine that jutted out from the back of its head.
There's been some speculation that Orthacanthus feasted on large prehistoric amphibians Eryops being cited as a likely example as well as fish , but proof for this is somewhat lacking.
The huge, sharp, triangular teeth of Otodus point to this prehistoric shark having attained adult sizes of 30 or 40 feet, though we know frustratingly little else about this genus other than that it likely fed on whales and other sharks, along with smaller fish.
The bluntnose sixgill is among the most fascinating species of shark due to its uncanny resemblance to prehistoric marine predators.
Also known as the Hexanchus griseus or cow shark, this deepwater predator keeps to itself and is not known to attack humans. Since the s, there has only been one documented attack.
And yet, marine biologists know very little about this mysterious species, due in no small part to due it living at substantial depths.
The Florida Museum of Natural History in the US said: "This large, deepwater shark is an example of more primitive species found only as fossils.
In , a team of researchers at the Osprey Reef off the coast of Australia managed to catch one of these beasts on camera. The shark was filmed as part of the Deep Australia project, which was an effort to better understand the evolution of human sight.
In the video, filmed by the Queensland Brain Institute and shared by National Geographic, the shark can be seen emerging from the depths, enticed by a severed fish head attached to a camera.