Question 1

How do you say Dryptosaurus?

Accepted Answer

Dryptosaurus is pronounced DRIP-toe-SORE-us. Break it into four parts: DRIP, then toe, then SORE, then us. The stress lands on the first and third syllables. Once you say it a couple of times it comes naturally, and you will definitely be the only one at school who knows this one.

Question 2

What does Dryptosaurus mean?

Accepted Answer

Dryptosaurus means tearing lizard, from the Greek words dryptos, meaning tearing or rending, and sauros, meaning lizard. The species name aquilunguis adds even more description, meaning eagle claws in Latin. So the full name essentially translates as the eagle-clawed tearing lizard, which is one of the most accurate and dramatic dinosaur names in the entire fossil record.

Question 3

How big was Dryptosaurus?

Accepted Answer

Dryptosaurus is estimated to have been around 20 to 25 feet long, or roughly 6 to 7.6 meters. It probably weighed somewhere between 1,500 and 3,000 pounds. That makes it considerably smaller than T. rex but still a very large, very dangerous predator by any standard. For context, it was about the length of a large moving truck.

Question 4

Was Dryptosaurus related to T. rex?

Accepted Answer

Yes, Dryptosaurus was a relative of T. rex, both belonging to the broader group called Tyrannosauroidea. However, Dryptosaurus was not a direct ancestor and was quite distinct from T. rex in some important ways, particularly its longer and more powerful arms. Scientists think Dryptosaurus may represent a separate branch of the tyrannosauroid family tree that evolved in isolation on the eastern side of North America while T. rex's lineage developed in the West.

Question 5

Where was Dryptosaurus found?

Accepted Answer

Dryptosaurus fossils were found in Gloucester County, New Jersey, near a place called Barnsboro. The bones came out of rock layers known as the New Egypt Formation. Remarkably, they were first discovered not by scientists but by workers mining a soil material called marl for use as fertilizer in the 1860s. New Jersey is not exactly famous for dinosaur discoveries, which makes this find all the more extraordinary.

Question 6

When did Dryptosaurus live?

Accepted Answer

Dryptosaurus lived during the very end of the Late Cretaceous period, approximately 67 to 66 million years ago, right at the end of the Maastrichtian stage. This means it was alive at almost exactly the same time as T. rex and Triceratops, just on the other side of a giant inland sea that split North America in two. It was wiped out in the same mass extinction event that ended the age of non-bird dinosaurs.

Question 7

What did Dryptosaurus eat?

Accepted Answer

Dryptosaurus was a carnivore and almost certainly the apex predator of its environment. Its likely prey included hadrosaurs, which were large duck-billed herbivorous dinosaurs that were extremely common in the Late Cretaceous. Dryptosaurus probably also hunted smaller dinosaurs, large reptiles, and possibly scavenged when the opportunity arose. Its blade-like serrated teeth and powerful eagle-like claws were perfectly suited for catching and consuming large prey.

Question 8

Why does Dryptosaurus have such long arms compared to T. rex?

Accepted Answer

Dryptosaurus had notably longer and more muscular forelimbs than its later relative T. rex, and scientists think this reflects its evolutionary history. Dryptosaurus lived in isolation on a landmass called Appalachia and may represent an older body plan that was retained because its environment did not push it to develop tiny arms. The massive hand claws on those longer arms suggest Dryptosaurus actively used its forelimbs in hunting, which is a key difference from T. rex's hunting strategy.

Question 9

Who discovered Dryptosaurus?

Accepted Answer

The fossils were unearthed by fertilizer miners in New Jersey, but the animal was formally described by the famous paleontologist Edward Drinker Cope in 1866. Cope named it Laelaps aquilunguis. However, because the name Laelaps was already taken by a mite, his equally famous rival Othniel Charles Marsh renamed it Dryptosaurus in 1877. Both men were central figures in the Bone Wars, one of the most competitive and dramatic periods in the history of science.

Question 10

Is Dryptosaurus the same as Laelaps?

Accepted Answer

Yes, Laelaps aquilunguis and Dryptosaurus aquilunguis are the same animal. Edward Drinker Cope originally named it Laelaps after a legendary Greek hunting dog, but that name was already being used for a genus of mite. Scientific naming rules require unique names, so Cope's rival Othniel Marsh replaced the genus name with Dryptosaurus in 1877. The species name aquilunguis remained the same, honoring Cope's original description.

Question 11

What was Appalachia and why does it matter for Dryptosaurus?

Accepted Answer

Appalachia was a large island continent that made up the eastern portion of what is now North America during the Late Cretaceous. A giant shallow sea called the Western Interior Seaway split the continent in two, separating Appalachia in the east from Laramidia in the west. Because of this separation, eastern dinosaurs like Dryptosaurus evolved in isolation from the more famous western dinosaurs for millions of years, which is why Dryptosaurus looks different from its western tyrannosauroid cousins.

Question 12

Has anything else been found besides the original Dryptosaurus fossils?

Accepted Answer

A few other fragmentary remains have been tentatively assigned to Dryptosaurus over the years from other locations in eastern North America, but paleontologists consider most of these attributions uncertain. The original specimen from New Jersey remains the only confirmed and well-documented material. The fragmentary nature of the evidence means Dryptosaurus is still a somewhat mysterious animal, and researchers hope future discoveries in the eastern United States will shed more light on it.

Dryptosaurus Pronunciation

What does Dryptosaurus mean?

Name Roots

Fun Facts

Learn More About Dryptosaurus

Related Dinosaurs