What was the very first shark?

Cladoselache

Cladoselache

Cladoselache is an extinct genus of shark-like chondrichthyan from the Late Devonian (Famennian) of North America. Growing to several meters in length, it is considered to have been a fast-moving and fairly agile marine predator due to its streamlined body and deeply forked tail.

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Cladoselache - Wikipedia

is regarded as the first "true shark". It lived 380 million years ago and it still retained a few characteristics of its fishy ancestors. It had a fish-like head, seven gills instead of five like most sharks, and its body was longer and less muscular than the sharks we see today.

Where was the first shark found?

The oldest confirmed shark scales were found in Siberia from a shark that lived 420 million years ago during the Silurian Period, and the oldest teeth found are from the Devonian Period, some 400 million years ago. Based on these fossils, more than 2,000 species of fossil sharks have been described.

When was the first sharks discovered?

The first representation of a shark-human encounter was discovered drawn on a vase dated from 725 BC.

What was the first extinct shark?

The earliest megalodon fossils (Otodus megalodon, previously known as Carcharodon or Carcharocles megalodon) date to 20 million years ago. For the next 13 million years the enormous shark dominated the oceans until becoming extinct just 3.6 million years ago.

Is megalodon still alive in 2021?

Megalodon is NOT alive today, it went extinct around 3.5 million years ago.

The Origin of Sharks

Was there a dinosaur shark?

Megalodon

Thought to be the largest fish and shark to ever live, megalodons were huge prehistoric sharks that were apex predators during their time. These giants lived from 23 million to 2.6 million years ago and ate large fish – such as whales and other large sharks – like it was no issue.

Who created sharks?

Most scientists believe that sharks came into existence around 400 million years ago. That's 200 million years before the dinosaurs! It's thought that they descended from a small leaf-shaped fish that had no eyes, fins or bones. These fish then evolved into the 2 main groups of fish seen today.

What came before the megalodon?

Great white shark evolution

Sharks soon began to increase in size once again, and continued to evolve larger forms throughout the Palaeogene (66 to 23 million years ago). It was during this time that Otodus obliquus, the ancestor to megalodon (Otodus megalodon), appeared.

Which animal is the oldest?

Jellyfish

Jellyfish are the oldest multi-organ animal in the world and have existed in some form for at least 500 million years.

What did the first shark look like?

During the late Devonian Era, the first shark in its modern incarnation appeared, the Cladoselache. The Cladoselache differed from its eel-like ancestors, because it's body looked more like what a modern shark looks like. It was six feet long, with a streamlined body, 5-7 gill slits, and dorsal fins.

Who is older sharks or dinosaurs?

Shark fossils date back more than 400 million years – that means sharks managed to outlive the dinosaurs, survive mass extinctions, and continue to serve an important role near the top of underwater food chains.

How did the megalodon go extinct?

One recent theory suggested that megalodon died off during a mass extinction event caused by a supernova 150 light years away that irradiated and heated our planet 2.6 million years ago. Research indicated that the radiation would have penetrated into the deep seas and persisted for years, killing animals en masse.

Which animal lives for 500 years?

The ocean quahog is a fist-size clam that can live to be 500 years or older. Some researchers believe the sturdy quahog's secret to a long life is its ability to protect its proteins from damage.

How old is the oldest dog?

Bluey was the name of the oldest dog ever reliably recorded. She was an Australian cattle dog, and she lived to be 29 years and 5 months.

Which animal blood is green?

BATON ROUGE – Green blood is one of the most unusual characteristics in the animal kingdom, but it's the hallmark of a group of lizards in New Guinea. Prasinohaema are green-blooded skinks, or a type of lizard.

Was Jaws a megalodon?

A new study from the University of Bristol and Swansea University has calculated the total body size of the Otodus megalodon - the distant ancestor of the great white shark depicted in hit blockbuster, Jaws, in 1975.

What is the scariest shark ever to exist?

Is the MEG real?

The Meg was real and it was absolutely massive, scientists say | Metro News.

What are sharks afraid of?

Contrary to popular belief, sharks are also quite afraid of humans! Being apex predators, it is natural that sharks will fear or stay away from the unknown, and that includes humans.

Who named a shark?

According to Jones, the very first mention of the word shark in association with the animal for which we use the name today was in a 1668 work by John Wilkes. One of the first mentions of the word in a dictionary, however, is in an anonymous work from 1689, which defines a shark as a “shifting knave”.

Who is the biggest shark?

The largest is the whale shark, which has been known to get as large as 18 meters (60 feet). The smallest fits in your hand. And the great white shark is somewhere in the middle.

Is megalodon extinct?

Able to grow up to 60 feet long with sharp teeth as big as the palm of your hand, the megalodon was around 20 million years ago and remained at the top of the shark food chain until it went extinct roughly 3.6 million years ago, according to The Natural History Museum in London.

Is the crow shark extinct?

The Crow shark is a rare and extinct species of shark, and - in common with most ancient shark species, very little is known about the shark itself.

What is a dragon shark?

Dracopristis (Hoffman's Dragon Shark) is a genus of extinct ctenacanthiform (spined fish) chondrichthyes (fish with cartilaginous skeletons) that lived around 307 million years ago, during the Pennsylvanian sub-period of the Carboniferous period.

What animal never dies?

To date, there's only one species that has been called 'biologically immortal': the jellyfish Turritopsis dohrnii. These small, transparent animals hang out in oceans around the world and can turn back time by reverting to an earlier stage of their life cycle.