Diplocaulus


Diplocaulus is an extinct genus of Leponspondyl amphibian who lived in the early Permian period, 270 million years ago. They had a arrow-shaped head, suggesting that this might have served better to swim in the water by moving the water to the sides like a shark or that depredadrores could not swallow. They measured about one meter in length. The first specimen was discovered in 1877 by Edward Cope in Texas called "Bone Wars".
This prehistoric animal ate fish and insects, and lived near water because it was an amphibian and used water as a roast for her eggs.
It looks like the Gerrothorax, sharing certain characteristics suchas this head shape, somewhat more pronounced in the Diplocaulus and eyes in a higher position inthe head.

Gerrothorax


Gerrothorax is an extinct genus of amphibian temnospondyl who lived in the late Triassic period (about 210 million years ago) in what is now Germany and Greenland. Reached an approximate length of 1 meter. Their bodies are flattened, suggesting they were hiding under the sand or mud at the bottom of rivers and lakes as potential victims stalked her large eyes focused upward. The skull had a peculiar way with angular protrusions on both sides. This geometry of the skull is reminiscent of the genus Diplocaulus, but less developed.

Fossils show that the species of this genus were pedomórficas, keeping three pairs of gills also in the adult stage, which allowed them to breathe underwater. This feature also found in some current caudate, as in certain species of the family and Ambystomatidae Mudpuppy.


Curiosity: The lower jaw was fixed Gerrothorax and chewing had to raise his head and drop it. That is, exactly the opposite of what we do and almost all the animals of creation.

Hyracotherium

Hyracotherium (beast like a Hyrax), also known as Eohippus, is a genus of mammal Perissodactyla Palaeotheriidae family.

It is considered an ancestor of the horse, rhinoceros and tapir. It is a quadruped animal that lived in the Northern Hemisphere (Asia, Europe and North America) during the Eocene period, makes 60 to 45 million years. The line to the existing horse evolució through the following animals Preistorica: Oligohippus, Merichippus, Pliohippus. In chronological order.



Hyracotherium was a small herbivore the size of a fox, media cross about 35 inches and weighed 6 kg, had four toes on the forefeet and three on hind paws protected, the central one being longer. These animals were already clearly like the horse, despite its small size and probably lived in forests browsing. His teeth were adapted for the consumption of young leaves of the bushes and his eyes were different from modern horses as they were located more to the center of the head preventing a good side vision (which in the modern horse serves as defensive system), Eohippus but did not need because in the jungle environment in which they lived, was more effective camouflage to avoid predators.

Entelodont


The entelodont is an extinct family of hoofed mammals related to the current pig and animals with hooves. Distributed in Asia and North America made between 45 and 25 million years. Measured about 2,1 m (7 feet) high, 3 `5 meters (14 feet)long and had a brain the size of a fist. It fed on carrion, oportunisatas, and plants. Not rule out the flush of live prey. Your lifestyle should look like pigs. Believed to be a omnivore because their teeth had large teeth and powerful back teeth. Like the pigs had a heavy body and short legs and a robust and thin.
With a size similar to Hyaenodon and weighing about 4,207 kg (9,300 lb) was the only rival of Hyaenodon.
For the morphological differences between male and female remains, it is believed that males were competing to win the group severamete females.

Hyaenodon.


Hyaenodon ( 'hyena's tooth ") is an extinct genus of mammals of the order of creodonts. Some species of this genus were among the largest terrestrial carnivorous mammals.

These predators were as big as a rhinoceros. Appeared in the late Eocene 41 million years ago, during the Oligocene to exist 21 million years ago.

Was the dominant predator of the time, even have discovered remains of saber-toothed feline powerful victim Hyaenodon.

The name "hyena teeth" refers to its pontente bite and hardness of his teeth. Being able to eat all parts of the dam, including the teeth.

His skull was long and narrow. The body was similar to the recently extinct Tasmanian wolf, Thylacinus. But larger.

At the time competed against Entelodon. I put a video showing that competition for food.


Glyptodon



The glyptodon, always connected with existing armadillos, a native of America. The glyptodon measured about 3 m and weighed about 1.4 t, being equivalent in size and shape to a Volkswagen Beetle. It was a herbivore and, by its constitution, it is assumed that it was not very agile. His defense against predators was based on its rigid shell. Different species are distinguished by different types of shells. Many of these shells remained empty throughout the plains of Uruguay and Argentina will likely serve as a refuge for early humans in the region.

The glyptodon is part of the group of placental mammals known as Xenarthra. This order of mammals includes armadillos, as well as several extinct species.

The glyptodon emerged in the Pliocene in South America, migrating north after, when the Isthmus of Panama joined the Americas. It is believed that they were hunted by human populations in their environment, to use the carcasses of dead animals as a refuge from hostile environments. Became extinct about 10,000 to 8,500 years.



The glyptodontes oldest known lived in the early Tertiary and were not very large. After appearing species were becoming larger, until in the Quaternary, when there were also megatherium, there were real giants who roamed in what is now Patagonia Argentina. They had a great half-shell shaped eggshell consists of many hexagonal shaped plates, round, etc.., He was locked below the animal's body with a sturdy skeleton, had a long tail, some species, finished off with barbed thick and compact.

Pterodactylus.



Pterodactylus is a genus of pterosaur (the first to be named and identified as a flying reptile) that lived during the late Jurassic Period. Fossils have been discovered in Europe and Africa.Its name refers to the long finger that holds the wing-like membrane bats. It was a carnivore and probably preyed upon fish and other small animals.

Pterodactylus was a relatively small pterosaur genus, with adult wingspans ranging from 50 centimeters (1.5 ft) in P. kochi to 2.4 meters (8 ft) in P. grandis

Pterodactylus was found to have a striated soft-tissue crest on the skull. Soft tissue impressions also showed unusually long, sharp, and recurved keratin sheaths on its claws. It was covered in hair-like integument, with a mane of longer hair running down the back of its neck.



http://en.wikipedia.org/wiki/Pterodactylus

Theriodontia


The teriodontes or teriodontos are named after the huge size and could reach the teeth of some of its species, mainly carnivorous, the Late Triassic had led an organization very similar to that of mammals. The temporal fossa was widening to allow the accommodation of large jaw muscles so that the hole reached the parietal and squamosal bones and postorbitario no longer be above it, and finally, the bar itself postorbitaria was incomplete leading to the typical mammalian condition in which the orbit and temporal fossa are fused.

The teriodontes or teriodontos (Theriodont, gr. "Beast's teeth") are a clade of therapsids ( "reptiles" mammal) that lived from the Permian to the Cretaceous.

This group was characterized by the lower jaw articulates with the skull bone in the small square by looking through powerful muscle bundles that made possible a wide range of yawn, making possible the emergence of species with huge teeth, as was the case of gorgonópsidos, the first known saber-toothed.

The special importance of this bone is not his presence, but its evolution along the jaw bone, which eventually forming the chain of middle ear bones of mammals. However, there is no evidence of secondary palate. The forelimbs are extensible and later also have the ability to erect posture.

The Theriocephaly, which started its development almost simultaneously to gorgonópsidos, also had additional features similar to mammals, as is the number of phalanges of the hand and foot, with a formula of 2.3.3.3.3, typical of mammals and that is what continues to hold the primates, including humans.

Spinosaurus vs Tiranosaurius Rex



T. Rex.
The tiranosaurius measured approximately 14 m in length.
He came to 5.6 meters.
An estimated weight of 6t.
T. rex had a large skull of 1.60 m fitted with eye and nasal fenestrae.
The neck was thick, muscular and short. It is said that the tyrannosaurus rex was the most fierce and powerful animal that has existed throughout history.
Period: Late Cretaceous


Spinosaurus.
The Spinosaurus measured approximately 15 meters in length.
Reach about 10 meters in height.
Its estimated weight was 7 tons.
Characteristic for its speed and agility that jutted out of his muscular legs and strong forearms equipped with huge claws, his nose was specialized for a quick bite at key locations and their body shape was aerodynamics.
Time: Cretaceous about 95 and 93 million years

For those who see Ice Age III, the great struggle is unleashed between the two titans.


Jurasic Park III

Dunkleosteus


Dunkleosteus, measuring up to 10 metres (33 ft) and weighing 3.6 tonnes (4.0 short tons), was a hypercarnivorous apex predator. Few other placoderms, save, perhaps, its contemporary, Titanichthys, rivaled Dunkleosteus in size.

Instead teeth, Dunkleosteus possessed two pairs of sharp gnathal plates which formed a beak. After studying a biomechanical model of the fish's jaws, scientists at the Field Museum of Natural History and the University of Chicago concluded that Dunkleosteus had the most powerful bite of any fish, With the exception of the Pliocene shark Megalodon.

Due to its heavily armoured nature, Dunkleosteus was likely a relatively slow (albeit powerful) swimmer. It is presumed to have dwelled in diverse zones of inshore waters, although it is unknown whether or not it was also somewhat pelagic, that is, swimming freely in open ocean.

Dunkleosteus had the most powerful bite of any fish, With the exception of the Pliocene shark Megalodon.

Dunkleosteus lived during the Devonian period, about 380-360 million years ago.
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