Question 1

How do you say Edestus?

Accepted Answer

Edestus is pronounced eh-DESS-tuss, with the stress falling on the middle syllable. Break it down as three parts: 'eh' like the start of 'egg,' then 'DESS' like the word 'desk' without the k, then 'tuss' rhyming with 'fuss.' Say it a couple of times fast and it starts to feel natural. A handy memory trick is to think 'I DESS-perately want to see those teeth' because Edestus is all about its incredible teeth.

Question 2

What does Edestus mean?

Accepted Answer

Edestus comes from the Ancient Greek word edeste, meaning 'to eat' or 'the eater.' Scientists chose this name because the creature's enormous, protruding tooth whorls were the first and most striking thing anyone noticed about it in the fossil record. The '-us' ending is a standard Latin suffix added to thousands of scientific names. So the full name basically means 'the eater,' which is a perfect description for an animal defined almost entirely by its extraordinary teeth.

Question 3

Was Edestus a real shark?

Accepted Answer

Edestus is often called a scissor-tooth shark, but it was not actually a true shark. It belonged to a group called Holocephali, which makes it more closely related to modern chimaeras and ratfish than to any shark alive today. True sharks and holocephalians split into separate evolutionary branches hundreds of millions of years ago. So Edestus was a cartilaginous fish and a distant relative of sharks, but calling it a shark is a bit like calling a dolphin a fish: close in some ways, but not quite right.

Question 4

What did those crazy teeth actually do?

Accepted Answer

That is the big question paleontologists are still arguing about. Edestus had permanent tooth whorls, curved blades of teeth that kept growing and pushing outward from the jaws until they stuck out of the mouth like scissors. Some scientists think Edestus slashed sideways through schools of fish with these blades. Others believe it stabbed upward into larger prey. A third idea is that it used the whorls almost like a can opener, puncturing and tearing prey rather than simply biting. No one has settled this debate yet, which makes Edestus one of paleontology's best ongoing mysteries.

Question 5

How big was Edestus?

Accepted Answer

The largest species, Edestus giganteus, could grow to around 6 meters, which is roughly 20 feet long. That is about the same size as a large great white shark today. Edestus would have been one of the top predators in the Carboniferous seas where it lived, alongside other large cartilaginous fish and early shark relatives. Smaller Edestus species were more modest in size, but even they would have been impressive animals by any measure.

Question 6

When did Edestus live?

Accepted Answer

Edestus lived during the Late Carboniferous Period, a span of time from roughly 315 million years ago to about 299 million years ago. To put that in perspective, this was more than 80 million years before the first dinosaurs appeared on Earth. The continents were arranged very differently at the time, and the seas where Edestus hunted covered large areas of what is now North America and Europe. Coal swamp forests, giant insects, and early amphibians shared the world with this remarkable fish.

Question 7

Why don't we have a complete Edestus skeleton?

Accepted Answer

Edestus, like all holocephalian fish, had a skeleton made entirely of cartilage rather than bone. Cartilage breaks down very quickly after death and almost never survives long enough to become a fossil. The tooth whorls, being much harder and more mineralized, are far more durable and are what we find most often. This is why almost everything we know about Edestus comes from its teeth. Reconstructing the rest of the body requires comparing it carefully to related animals and looking for rare impressions in rock where soft tissues occasionally left a trace.

Question 8

Where have Edestus fossils been found?

Accepted Answer

Edestus fossils have been discovered in the United States, the United Kingdom, and Russia. All of these locations were covered by warm, shallow seas during the Carboniferous Period, when the continents were positioned very differently than they are today. The fact that Edestus fossils appear across such a wide geographic range suggests it was a successful and widespread predator during its time, roaming large stretches of the ancient ocean that connected these now-distant regions.

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