Dinosaurs » A-Z Dinosaurs List » Apatosaurus Dinosaur
formerly known as Brontosaurus (erroneously named Brontosaurus
by Othniel Charles Marsh after he incorrectly placed the
head of a Camarasaurus on the body of an Apatosaurus), is
a genus of sauropod dinosaurs that lived about 140 million
years ago, during the Jurassic period. They were some of
the major land animals that ever existed, about 4.5 meters
(15 feet) tall at the hips, with a length of up to 25m (80
feet) and a mass up to 35 metric tones (40 tons). However,
the Argentinosaurus was even larger.
The cervical vertebra and the bones in the legs were larger and heavier than that of Diplodocus, but they both had the long neck and tail. Apatosaurus skeleton which was found at the American Museum of Natural History. The skull was first recognized in 1975, a century after it got its name. The Apatosaurus had a claw on its hand, but only the thumb. Scientists have a theory about the tail being lifted perhaps a meter above the ground. It would prevent the dinosaur from stomping on it, and put the tail out of arrive at of predators.
Early on, it was believed that Apatosaurus Dinosaurs was too massive to support
its own weight on dry land, so it was theorized that the sauropod must
have lived partly submerged in water, perhaps in a swamp. Recent conclusion
does not support this. Fossilized footprints indicate that it probably lived
in herds. To aid in dispensation food, Apatosaurus may have swallowed
gizzard stones (gastroliths) the same way many birds do today —
its jaws alone were not sufficient to chew tough plant fibers.
The Apatosaurs perhaps lumbered along in flocks on riverbanks with trees,
eating off the top leaves. Scientists believe that these sauropods could
not raise their neck to an angle of 90 degrees, as doing so would sluggish
blood flow to the brain excessively; blood starting at the body proper
would take two or more minutes to reach the brain. Furthermore, studies
of the arrangement of the neck vertebrae have revealed that the neck was
not as flexible as previously thought. No one knows how Apatosaurs ate
enough food to gratify their enormous bodies. They probably ate constantly,
pausing only to cool off, drink or to remove parasites. They must have
slept standing upright. If attacked by a predator, it could preserve itself
by swinging its tail from side to side, or stomp at the meat-eater. Because
of the Apatosaurs’ slow velocity, they lived in herds, and they
could "call" on each other, if one needed help.
Classification and history of Apatosaurus Dinosaurs
In 1877, Othniel Charles Marsh available notes on his discovery
of the Apatosaurus,
and then in 1879 described one more, more complete dinosaur
— the Brontosaurus. In 1903, it was discovered that
the apatosaur was in fact a juvenile brontosaur, and the
name Apatosaurus, having been published first, was deemed
to have priority as the bureaucrat name; Brontosaurus was
relegated to being a synonym. The name was not formally
removed from the records of paleontology until 1974.
Fossils of this animal have been establish in Nine Mile Quarry and Bone
Cabin Quarry in Wyoming, and at sites in Colorado, Oklahoma, Utah, USA.
A. Ajax is the type species of the genera, and was named by the paleontologist
Othniel Charles Marsh in 1877 after Ajax, the hero from Greek mythology.
It is the holotype for the genera, and two partial skeletons have been
found including part of a skull.
A. Excelsus (originally Brontosaurus) was named by Marsh in 1879. It is
known from six partial skeletons, including part of a skull, which have
been establish in the United States, in Oklahoma, Utah, and Wyoming.
A. louisae was named by William Holland, in 1915. It is known from one
incomplete skeleton, which was found in Colorado, in the United States.
Robert T. Bakker made A. yahnahpin the type species of a new genus, Eobrontosaurus
in 1998, so it is now correctly Eobrontosaurus yahnahpin. Filla, James
and Redman named it in 1994. One partial skeleton has been found in Wyoming
||Apatosaurus (erroneously named Brontosaurus by Othniel Charles Marsh)|
|| 80ft long and 15ft tall
||Apatosaurus, a giant sauropod dinosaur, had a pointed claw on each front foot, which it may have used for defense. |
Apatosaurus by Daniel Cohen
Description:Provides information on the physical characteristics, behavior, habits, and relatives of the dinosaur known as Apatosaurus.
Apatosaurus by Corel Lindeen
Description: Present the life of the dinosaur known as apatosaurus. Includes information on how this prehistoric animal looked, along with its behavior.
Apatosaurus by Joanne Mattern
Description: Provides information about apatosaurus, including what they ate, how they interacted with one another, and how they defended themselves.
Apatosaurus by Richard Gaines
Description: Describes the physical characteristics of the Apatosaurus, the environment they lived in, and how they lived.