Ceratosaurus Dinosaur

Ceratosaurus means ' horned reptile.' It was discovered by O.C Marsh in 18184. There are 3 classification, Saurischia, Theropoda and Ceratosauridae and it remains found in North America and East Africa.

These have a dimension of 6 metre length, 2 metres height and 900 kilograms weight. There food was carnivore.

Ceratosaurus was a strange dinosaur distinguished by several little horns on its skull. A larger one on the nostrils and two smaller ones above the eyes. Its teeth were barbed anusually large.
Along the back and tail was a kind of crest consisting of small, bony nodules.
Ceratosaurus was a biped and the front limbs had hands with four digits.

Bagaceratops Dinosaur

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Bagaceratops means "little-horned face". It was discovered by Maryanska and Halszaka Osmolska, in 1975. and the remains found in Asia.

There three classifecation of Bagaceratops, Orrnithischia, Marginocephalia, and Protoceratopsidae.
It has a dimensions of 1 meter length, 50 centimeters and 22 kilograms weight. There food was herbivore.

Bagaceratops was a quadruped dinosaur, small but powerful, with a distinctive, toothed, bony crest along the back edge of its skull and a small horn on its muzzle; it had strong jaws and teeth for finely chewing the vegetation on which it fed.

Bagaceratops is one of the dinosaur which was found in Mongolia and it is regarded as one of the most primitive of the ceratopsians. As well as fossilized skeleton remains, its nests and eggs have been found.
Now as then at the end of its mouth, it had a beak similar to that parrot, useful for cutting vegetation.



The skull of Bagaceratops

ARGENTINOSAURUS Dinosaur

Argentinosaurus, means 'Argentine lizard'.It was discovered by Bonaparte and Coria in 1993. The remains found in South America. It has a dimensions of 40 meters length and 1oo tonnes weight.
There are classification of Argentinosaurus they are Saurischia, Saurodopa, and Titanosauridae.


Argentinosaurs, belongs to the family of land-dwelling animals which were probably the longest and heaviest which have ever existed. It was a gigantic dinosaur with an extremely long neck and tail, a some what slender body and tiny head; so, to excavate a complete skeleton of such a large dinosaur is very rare.
For Argentinosaurus, for example, we have found only some sections-some vertebrae, fragments of ribs, one tibia and pelvic bones. The experience of the palaeontologists, their expert knowledge of anatomy of the giant plant-eating sauropods and the ratio of measurements between each section has enabled them to reconstruct their size and appearance.

Argentinosaurus, is a record-breaking animal. Its 100 tonne weight makes it the heaviest dinosaur known so far.
Now, as then the sauropod dinosaurs had huge pillar-like legs in order to support their enormous weight. The digits rested on flexible, soft pads like those of the elephant, the largest land-dwelling animal today.






The bone leg of Argentinosaurus.

ARCHAEOPTERYX

Archaeopteryx, means 'ancient wing'. It is discovered by Meyer in 1861 and found in Europe. It has a dimensions of 50 centimeters length,25 centimeters height and 50 grams weight. There food was carnivore and insectivore.

Archaeopteryx, was a little like a small carnivore dinosaur and a little like a bird. Like all dinosaur, it had a long tail, sternum (the flat bone in the center of the thorax), three strong clawed digits on each 'wing hand' and a mouth with lots of sharp teeth curving inward. As with all birds, the Archaeopteryx had a wishbone, two 'big toes' pointing backward for perching on branches of trees and a body covered with plumes and feathers. This makes the Archaeopteryx a classic link in evolution which demonstrates how birds have developed from dinosaurs. It is believed that the Archaepteryx was a fine flyer.

Archaeopteryx is considered by many palaeontologist to be the oldest known bird. Study of the species has enabled scientists to understand the evolution of dinosaurs to birds and how they adapted to flight.

APATOSAURUS DINOSAUR

Apatosaurus, means 'deceitful lizard'. In fact, this dinosaur 'deceived' Othniel Marsh, the palaeontologist who discovered it in Marsh in 1877. He found some dinosaur bones and called it Apatosaurus. Two years later, he found other remains and thinking that these belonged to another species, called the 'new' dinosaur Brontosaurus(thunder lizard) Only later was it found that all these bones belonged to the same species of dinosaur. The first name Apatosaurus, is actually the correct one.
The remains of the Apatosaurus were found in North America.

Apatosaurus has three classification namely Saurischia,Sauropoda and Diplocidae.
It has 27 meters length,8 meters height and 35 tonnes weight dimension.
There food was herbivore.

Apatosaurus, was a powerful dinosaur, chracterized by legs like thick columns and a very long neck and tail-but with a head measuring only 55 centimetres,so tiny compared with the rest of the body! In its mouth it had long teeth at the front in the form of a sort of comb, useful for tearing leaves and shoots from branches of trees. The massive muscles in its back could have enabled the Apatosaurus to raise it self up on its hind legs to reach the most tender leaves at the tops of trees.
The long tail, very thin at the end, was a formidable weapon which the Apatosaurus could swish from side to side at incredible speed,whistling like a whip and shattering the bones of any enemy trying to get near.

During excavation one Apatosaurus skeleton and one Camasaurus skeleton were unearthed-but only one skull seemed to fit with the rest of the Apatosaurus remains, it was thought that the skull belonged to this dinosaur. For many years to come, the Apatosaurus wasss thought to have a skull belonged to the Camasaurus! And so, the Apatosaurus lost its head and remained without one until the discovery of a new, complete skeleton with the 'right' skull.
Now as then defending by using the tail is not so unusual: the iquana, for example behaves the same way.

ALVAREZSAURUS DINOSAUR

Alvarezsaurus,means 'lizard of Alvarez' named after the historian Don Gregorio Alvarez. It is discovered by Bonaparte in 1991 and found in South America. It has the dimension of 2 meters length, 55 centimeters height and 8 kilograms weight. they eat carnivore and insectivore.

Alvarezsaurus, was a biped dinosaur, agile and with a very light body, its feet and long rear limbs making it a fast runner. It arms were very small and almost withered, so not much use. It neck was 'S'-shaped and its stiff tail-more than a meter long- was used by the Alvarezsaurus to keep its balance.
Alvarezsaurus was a dinosaurus closely linked to birds.

The Alvarezsaurus is classified both among dinosaurs and within groups of primitive birds. The most recent discoveries seem to suggest that they are members of the dinosaur family- but there is still some disagreement about this. Now, as then long'S'-shape neck of the Alvarezsaurus is like that of today's flightness birds, such as ostriches, emus and rheas.




Alvarezsaurus skeleton bone.