Showing posts with label Cretaceous. Show all posts
Showing posts with label Cretaceous. Show all posts

Dreadnoughtus.


We found another giant dino in Argentia. A country where we found a large dinosaurs such as Argentinosaurus, Giganotosaurus, the Tyrannotitán or Madtsodia Bai, all with records in size and can be many sauropods, theropods, or the serpent, the world's largest.

The name of the great saurian, a large sauropod and what some call "the king of the dinosaurs," has been named to Dreadnoughtus, which could translate as "he who fears nothing."


Maybe call it "the king of the dinosaurs" is a bit exaggerated. Mostly because if there was a king, this could be the Argentinosaurus, a saurian also found in Patagonia Argentina but measuring up to 35 meters in length; this is about 8 meters more than Dreadnoughtus measuring 26 meters. We must clarify that the measures that have been extracted from fossils found, and it seems, could be a copy would not be fully developed, so it can even be bigger or heavier.

If we compare the weights, Dreadnoughtus reaches 65 tons. And the Argentinosaurus perfectly exceeded 100 tons, some estimates put it at 130 tonnes.



Dreadnoughtus What do we know?

First of all note a curiosity, the name refers to one of the battleships armed Argentina: monocaliber battleships. But do not mix ....

What is striking is that this prehistoric animal were recently discovered, and not one or two bones as usual, but much of the skeleton. It has been found 70% of the skeleton, also in very good condition and its deformation (by the weight of the earth) is minimal. In fact, it has provided new information about the pelvis, extremities and shoulder girdle of Titanosauria family. A family that owned the Dreadnoughtus but also Diplodocus, Giraffatitan or Argentinosaurus.

They were large herbivores that dominated the earth, like all sauropods. Elongated necks and stylized whiplike tails. A highlight feature of this lizard, was that its neck was compared with other sauropods, a bit thicker and more muscular.


The great saurian lived in the forests of what is now South America 75 million years (Cretaceous) ago.

Chirostenote


Ladies and gentlemen, sorry for a season without dealing the blog as much as I would have liked, but that is over. Moreover, nothing happens, the dinosaurs are timeless and, in gratitude and with intent to redeem myself, I want to show you one of the most picturesque dinosaurs that ever lived. This is the Chirostenotes, the "narrow hands."

You see the image below, you will understand what the name refers Chirostenotes or "close hand" ... no trick, its hands were narrow.



The "hands" of this saurian, were long and narrow, with very long fingers ending in sharp claws. That is the main feature.

Another feature of this prehistoric animal was its head. Look at the image below.


You know who is? As this animal is a Cassowary, a bird now living in Australia and New Guinea ... and is very aggressive. It is thought that the ridge has the Cassowary is similar to that which took the Chirostenotes. In fact, it seemed a little ... even thought this lizard was a bird. It had feathers, was bipedal, lakes and light arms and a crest like a Cassowary. But it really was not a bird.

Chirostenotes's jaw was sort of a parrot but was full of teeth. Media about 3 meters long and when were stood as tall as the average man. Grew to weigh no more than 60 kg. And think were fast and agile hunters who traveled at high speed and making great leaps and light careers.

It lived 75 million years ago in what is now Canada. And it is known today more than ever, especially for children, as it is one of the protagonists of the series of drawings Dinotren. Is smug and was known as Keenan.

Rugops


Not all prehistoric animals are frightening Tyrannosaurus, Allosaurus and Spinosaurios ... no, there are others .... but those do not interest us today (MUAHAHAHA) .... we want blood, claws, large teeth and formidable carnivores able to intimidate only imagine. Let the beasts that we like, for example, to Rugops. This prehistoric animal of the Cretaceous (about 95 million years ago), lived in Africa and is a terrible theropod (like the T-Rex for example) family of abelisaurs (lizards Abel) ...

While Rugops (wrinkled face) was large: it could reach 8 feet long and weighs same as a hippo, never got the position of dominant predator. As we have said, lived in Africa, and in that time there was another predator floating around .... the Spinosaurus.

It is this reason that some experts think it may be more of a scavenger rather than a predator ... but do not really understand how they have come to that conclusion. Right now, today, we see that the lion is bigger than a hyena, hyena hunting but even more than the lion.
Other features of this carnivore is that had small arms ... now I can say "Most theropods have small arms." Yes, true, but the Rugops was an animal with proportionately still smaller forelimbs, were little more than stumps .... to give you an idea, our arms are longer than the arms of Rugops. And considering that I could reach 9 meters is simple we get an idea of ​​their hands ... or little claws.

Moreover, as the name suggests, its skull had a half meter bony protuberances, full of venous capillaries that gave its a gruesome appearance, as if it were bad and deformed film.

Finally, some authors believe that had spikes on the neck and tail. Although they found no evidence of this, nor of barbs or inserts .... but hey, maybe that is because lately it is changing the conception we had of the saurian, such as T. Rex, is probably had therefore also the Triceratops, a few years ago it was learned that Velociraptor had feathers ... anyway. 

Below, Spinosaurio having hunted and waiting for the bottom Rugops their cake.

Dilophosaurus.


When I saw it for the first time (Cretacic) Jurassic Park ...


I thought ... - it is impossible that this creature may exist, they have been wrong. But I was the one who was wrong was thinking this ... it really did exist. It was a lizard in the Cretaceous that lived 200 million years ago in what is now North America and parts of China. Its name refers to its main feature: Dilophosaurus means "lizard two peaks". A bone crests that run along the cranial vault and are coming together in approaching the nostrils and give it a look as angry.

But apart from these two bony protrusions, it is noteworthy that the two membranes are born from the beginning of the neck and which maintains folded until suddenly extends them. Are thought to this membrane was deployed when was intended to look bigger compared to others that might arise as a threat, rather large lizards or other species of the same species. At initially thought that also served as a deterrent in clashes pairing ... but maybe this idea is wrong because females also exhibit membrane. Finally, females may also have to fight each other for territory.



These membranes resemble the actual Frilled, but much larger. In fact, the Dilophosaurus was a super-predator of the time. Media about 7 meters long (22 ft.) and weighed about 350 kg  (770 lb.).... in fact it was light enough for its size. It was fast, bipedal, with skull rather small and not massive, and long and slender neck and tail. In its skull had a boss that we have appointed a small crest bone.

By their fossil remains are thought to the Dilofosauro, was devoted to feeding carrion and small game, as it had no bite, no mass, nor necessary for hunting large prey strength. Another idea that seems well founded is that since it has long, thin teeth, with long necks and light heads, it is possible that much of their diet from fish outside.

And finally, something I do not know, where Jurassic Park were removed this prehistoric animal they are poisonous? That is not proven.

Gastonia.


Family of ankilosauridae (which are protected under bony armor, armored lizard literally), we can point the Gastonia burgei. A herbivorous whose most notable physical feature was its enormous armor protecting the back of the body and neck and serves as an indication to know your storyline. An armature, a row of spines and bumps that made ​​it impossible to sink your teeth predators. Besides working in packs, and facing a predator joined rows forming impassable reminds African buffalo versus lions.

The characteristics of the excavation where the fossilized bones were found, no one knows exactly the number of spines possessed. Is known is that some reach 50 cm (1,7 ft) in length, therefore, predators should be very careful not to bump into these horns if they did not to lose an eye, or were nailed to the heart or lungs.


In fact, its only weakness was the belly, for that, the predator must rotate in order to reach an area unprotected. Something that is very difficult because the Gatonia was an animal with a very low center of gravity and weighing more than 1000 kg (2204 lb). Length up to 5 meters (7 ft) long, with a tail of 2 meters which it used as a whip and a simple swipe of the tail, was able to knock down a predator.

Found between predators to Utahraptor, which by name and intuit that was in Utah, in the United States. And the Gastonia lived mainly in what is today North America and Europe during the Cretaceous period, about 125 million years ago.



A curiosity about Gastonia. Phylogenetic by this prehistoric animal is the Ornithischia. This animal, known for their muscles, strength and be massive and heavy, shares a similar bird hip, which means bird and ornitheos ischion by hip. But this similarity does not mean anything, is only superficial because birds are from the order Saurischia

Pachycephalosaurus


Since I can remember I always wanted to know more and more about dinosaurs, more and more, and my atraena me most was the Pachycephalosaurus. In all the pictures I saw when I was little, it appeared this saurian with what to me looked like a piece of shell that had not yet shaken off. Years later, looking around, I discovered that it was a piece of shell, but its head, its skull formidably thick and strong. Able to withstand the strongest thrusts like the shell of a turtle. I also discovered that the name "Pachycephalosaurus" means literally that: lizard or reptile thick head.

The next thing I asked was why on this lizard had this strange head? My first conclusion was that used to hit, to dispute with other males the dominant male position ... do something like bison and bulls have horns or a bony prominence at the top of the skull. Although I'm not sure why, some experts have dismissed this feature ... but then why has a skull with a 25 cm thick? ... Not everyone agrees that the Pachycephalosaurus not have this bulge to beat their opponents. Many people, as I am, ignorant, think that is the most likely explanation. Others think that the issue that brought its bulging head served to intimidate predators.It is true that possibly get, because along the shell, there were numerous small spiny protrusions capable of hurting. Probably, the predator would attack, receive the following message: I'm not very big, I have no fangs or claws, but I have a weapon / protection in the most fragile part of the body .... the neck and head. What is evident is that its thick head was protected its tiny brain blows ... had special protection. So not only seemed difficult to hunt, but also it was.

The only species of this genus was P. wyomingensis and as the name suggests, was found in the state of Wyoming, in the United States. It was a herbivore (or omnivore) of late Cretaceous and may have been represented in this prehistoric animal illustrations and on the horizon the meteorite that ended with most of the dinosaurs 65 million years ago, along with the T.Rex and Triceratops.

Could reach up to 7 meters in length and can weigh nearly 3 tons. Its hind legs were strong, however the front were small and "weak", for this is thought to be traveling in a biped. Tail was robust and heavy to counteract the weight of the head.
The neck was short and sturdy able to sustain its heavy skull (this could be evidence that it received and provoked strong impact with his head). Its teeth were small and elongated (so you think he could be omnivorous small dams).

Although it has long been known to this lizard, about 80 years, there have been few remains that have been found, so talk it over, it might be speculated.

Sauroniops

Who has not seen The Lord of the Rings: The Fellowship of the Ring? Or The Lord of the Rings: The Two Towers? o The Lord of the Rings: The Return of the King?, probably all have seen and certainly know who Sauron. The science fiction character created by Tolkien and that is the representation of evil. Its eye is all-seeing, is the eye of the devil on earth.


Well curiously, there was a dinosaur that, when discovered, was baptized with the name of Sauroniops, which means "Eye of Sauron". Personally I look weird, I find it very curious that have given the name of a science fiction character to a prehistoric animal, well known for it. So I've been investigating why this curious name and I discovered something: this saurian bones were found a few years ago, in Morocco (Africa) and at first had only one bone, the top of the skull closed eye and I had conical pyramid shape (reminiscent of Mordor mountain), so researchers, in a moment of inspiration, decided to borrow the name of Sauron for naming this prehistoric animal.

Well, part of this curiosity, how was the Sauroniops?

This was a theropod and theropod. The was a large theropod dinosaurs group with common characteristics such as walking with strong hind legs and essentially carnivores. A group where we can meet other dinosaurs like T-Rex or Giganotosaurus.

The species Sauroniops pachytholus, could reach up to 13 meters (42 ft)  and the skull could exceed 1.5 meters (5 ft) in length. A powerful bite of a mouth full of sharp teeth as knives adapted for tearing the body of their prey.

A physical characteristic that would help to distinguish it from other theropods (and in particular of other Carcharodontosaurios, physically very similar) was the bulge protruding from the top of the skull and that was the inspiration for its name. We look like a small T.Rex but one bump on the head.

Troodon


Now Troodon has thousands of fans who are children of 2-7 years old ... or a little more. Although it was one of the first dinosaurs found, now it gets to know as one of the characters in a cartoon series, a character friendly and fun. But that image is far removed from reality. In fact, "Troodon" name literally means "wounding tooth", so get an idea.


The Troodon belongs to the group of theropods (prehistoric animals with strong back legs). A suborder where we find most frightening terrestrial species of the story ... as the Spinosaurus, Tyrannosaurus rex or Allosaurus. Referring to the teeth, the Troödon were quite different than that of other carnivores mentioned.
The teeth of T. Rex were as heavy knives, however, were those of Troodon elongated narrow and sharp edges saws ideal for tearing flesh.


Indeed, this animal lived in the upper Cretácido became extinct 70 million years *. It was a prehistoric carnivore forests in what is now North America. But it never became an apex predator as their size was relatively small and could not compete with other theropods.


It reminds me a little velociraptor. First because of its size and secondly because they were very similar morphologically. The two, Velociraptor and Troodon, were very close (evolutionarily speaking) birds and probably both had feathers. Although they could not fly ... we leave that to the birds. But maybe it big jumps or even plan a few meters.

The Troodon was twice as large as the velociraptor. Was elongated like this, also agile predator and 1 meter in height and two in length, weighing up to 50 kg. A Trodonte of these, a human could make enough damage or even kill it.

But do not demonize an animal and say it's bad. But if you're a parent and your child likes Troodon, you know it's not the friendly character we see in the series of "Dinosaur Train". He was an active hunter, a predator elongated as a young Komodo dragon but occasionally will put on its back legs.


* If you look at this picture, you will see that next to the Troodon's one of the "Aliens" that were found in Roswell. According to a paleontologist: these alien beings would be the trodontes that survived the mass extinction of dinosaurs and evolved ... Over millions of years evolved and could reach out to Earth, then returned and are in Roswell .... curious ...

STYRACOSAURUS


Within the family of ceratopsidae (those horned animals that lived in the prehistory), we can find some animals we know. Since Torosaurus (large and with two horns) to the Eotriceratops, Triceratops (always represented fighting a T. Rex and three horns) and Pentaceratops (smaller than the other two but with 5 horns) ...

As you can see, in this short list you can see that the number of horns increases between 2 and 5. At the end of the list more would see the ceratopsian horns, Styracosaurus, the protagonist of this entry.

The name means lizard Styracosaurus horns.

It had a horn on the front of the head, one big and long, but most of the horns, to which its name refers, are those found in the "wheel" of the head, a bone coating that protects the neck. A hedge that protects the neck from predators carnivores such as T. Rex. But the horns of Styracosaurus, not small bony protuberances, horns are up to 60 cm long and 15 cm wide at the base. This contained the snacks in the neck and the same also used for exposing himself to females.

So, this herbivore than 3 tons and 6 meters long would be therefore difficult to kill prey. Fossils found dead near ceratopsidae Tiranosauros like Styracosaurus who have tried to hunt. Hunt In Styracosaurus, T. Rex could be gored to death.

The horns and shells daubed the neck, the most vulnerable part of the animal, predators could not bite the neck without risk a fatal goring. The predator hunting tactics would try to turn the Styracosaurus and put belly up, where the T.Rex would find the most soft, unprotected part and away from the huge antlers.

This large herbivorous mid Cretaceous lived in what is now North America. And from afar, remind us a huge rhino with large spiked collar and long tail. Indeed, like other ceratopsidae, had a mouth shaped peak finished ... psittacosaurus reminds me.


PSITTACOSAURUS.


Somewhere in Asia where we now find Mongolia, 100 million years ago (Cretaceous) there was a genre of curious animal called a Psittacosaurus "parrot lizard".


A bipedal lizard 2 meters long, with special characteristics that made it look somewhat freaky. Its mouth was toothless in general, although some species did have small sharp teeth to devour the new flowering plants that appeared for the first time in mid-Cretaceous. Its mouth closed with a strong peak like that of a parrot and hence the name Lizard Papagayo. A peak bone, a protuberance of the skull finished with keratin (like rhino horn) that provided a hardened tip and sharp as that of a parrot.



The other peculiarity of this animal is that its tail and back were covered with tubular and hollow bristles. One thinks bristles served as a peacock tail.

Walking on two hind legs, had tubular and hollow bristles as protofeathers, the parrot-like beak and normal ... now would wonder if it was related to birds. And the answer is NO. In fact, and this certainly surprise you, is related to the Triceratops or Eotriceratops. (Ceratopsia)
Animals heavy, clumsy, weighing several tons and with horns, one, three or even five. But if you look at the representations that have been made in the fossils found, we see that these large animals ... also have beaks.

Albertosaurus.


I often think that the experts not too fussed for naming dinosaurs. For example, if they find a lizard in Alberta (a province of Canada), as they call Albertosaurus. Well, I'm no expert and I guess that is a valid way to classify other prehistoric animals.

And how was Albertosaurus? Well, this animal had many curious things. For example, Albertosaurus was a fearsome hunter, its bite while being less potent than the T.Rex, was very powerful, as well as the largest of the crocodiles, which are animals with bite even more powerful live.
We could say it was like a smaller version of Tyrannosaurus, but not that much less effective as a predator. Because when weighing 2 tons (nearly half of T. Rex), Albertosaurus could be quicker, faster and agile. An estimated could exceed 50 km / h (31 mi/h)... To get an idea, Usain Bolt (the fastest man in the world) reaches 37 km / h (22 mi/h).


The dimensions of this predator prehistoric were:

Weight: up to 2 tons (4400 lb).
Length: 10 meters (33 ft).
Skull: 1.2 meters (4 ft).
Height: 3.5 meters (10 ft).

As you see, it was so small, was a smaller version of T.Rex, and in fact, the only impediment to not become the apex predator of the late Cretaceous in North America, was this, that the T.Rex occupied that position.

Other characteristics of Albertosaurus was that had small arms, hardly useless.
Also had bony protrusions on the eyes which had the role of protecting the eye when producing its deadly bite.
And finally, have sharp teeth on the inside a form lumber, this allowed it to tear the flesh once bitten and pulled with his strong neck.
Albertosaurus really is the name of a genus and now consists of three species, but the most representative was Arctunguis Albertosaurus.

The Pentaceratops.



To end this year, 2012, best animal to learn that the prehistoric Pentaceratops. It could be any other, nothing would happen, but this is a little special. Basically, the reason that I consider this animal special, not because I have three horns and call Pentaceratops (5 horns), but because it is the largest land animal with the head of the whole story.

If someone calls you "big head" is because they do not know the Pentaceratops. An animal with a head of up to 3.5 meters (12 ft). A strong neck muscles full of robust bones embedded in supporting a large skull with a bone covered with thorns wheel and 2 meters (7 ft) in diameter. This collar bone was a formidable protector and a dominant male signal.

The Pentaceratops was taller and thinner the triceratops, less heavy, but a little higher. With strong legs, almost 6 tons, as a male African elephant, and 8 meters (26 ft) long. It, like other ceratopsians, was an herbivore and gregarious. With its enormous beak similar to a parrot, tore branches and bark to eat.

The Pentaceratops lived around the Campanian, Late Cretaceous 75 million years ago. Therefore triceratops existed before and not had to face with T.Rex. However, if you had the predator to Daspletosaurus or Acrocanthosaurus.

By the way, we see its curious name: your name means five horns and really have 3 is because it had two great apophysis (build bone) protruding from their cheeks. Views with meat, muscle and skin, these bumps closely resemble the bumps of the warthog.




Beelzebufo ampinga or Devil Frog.


To begin the week and make it more bearable, I had thought about an animal today, very curious, which was discovered 4 or 5 years ago and that is the physical evidence of a fascinating event happened on Planet Earth. This animal is called "Beelzebufo ampinga".

Beelzebufo ampinga the Latin "Beelze" means devil, "bufo" means toad and "ampigna" means shield. It is the largest frog discovered in the world. Beelzebufo lived 70 million years ago in the Cretaceous in Madagascar. It shared the world with some known dinosaurs like T-Rex, and although it was no match for them, thanks to their huge mouths, could hunt small dinosaurs, babies and eggs, and other amphibians.


It measured just over 40 cm (16 in) and weighed 5 kg (10 lb), actually the largest frog is the Goliath, with 30 cm and 3 kg (6 lb). The ampingade Beelzebufo skull is composed of a thick shell and their teeth were strong and sharp. Its bite was very powerful and huge mouth, about 35 cm (12 in)  wide. The detail of its mouth is very important, its mouth was large compared to other frogs or toads, in fact it was this characteristic that served to classify this "frog" in the group of prehistoric "Pacman Frogs" or Ceratophrys, a group of frogs living in South America and have a big mouth. And here the controversy.
The earth 80 million years ago

How can it be that the "Pacman" are from South America andon the other hand, locate devil frog in Madagascar?
In principle this creates a contradiction. 70 million years ago, the continents had already split and although nearer than they are now, it would be impossible for terrestrial wildlife pass from one continent to another without encountering miles and miles of ocean. However, some experts think that there was a land connection between South America, Madagascar, Antarctica and possibly to some 65 to 70 million years. It's the only explanation, and if so, "continental drift" was not in order and not in the mode that we were taught in the representations.

Bruhathkayosaurus measuring


As we have the latest posts dedicated to mammals, marsupials antique and prehistoric arthropods, the truth is that this time I wanted to speak again about dinosaurs, large reptiles ... titanic sized reptiles ... I love it!


The prehistoric animal which we will discuss today, is called Bruhathkayosaurus (which does not refer to a yoga posture which we might call "the reptile"). Its name comes from the Sanskrit bruhath (बृहत) "big, fat", and Kaya (काय) "body" and then, from the Greek meaning saurus reptile: the lizard of large, heavy body.

The Bruhathkayosaurus, and specifically the spice called matleyi, was a giant sauropod, titanosaurids-called. A titanic as the famous sauropod Argentinosaurus and Diplodocus: large herbivorous reptiles 4 legs, long necks and long tails.

By name, Bruhathkayosaurus, we can intuit that the bones have been found in India. And their fossilized bones can extract and calculate the dimensions of this amazing beast. Compare with the two other known sauropods.

The Diplodocus was 30 feet and 80 tons.

The Argentinosaurus 35 meters and 100 tons (some think more).

The Bruhathkayosaurus measuring 40 meters and could weigh up to 140 tons.


If one day we will be sure of the existence of Amphicoelias, Bruhathkayosaurus could say that would be the second largest dinosaur on Earth ... but since we are not sure of the existence of Amphicoelias we can say: the Bruhathkayosaurus, the animal was longer and heavier than ever existed. I will not get into an argument about its dimensions ... if yes, if not ... the point is that rivaled in size with the known Argentinosaurus. (sorry for the Argentines who were proud of the huge prehistoric animal bearing the name of their country).

Keep in mind that 140 tons is a lot, sometimes, we get lost in numbers and costs us get an idea of ​​the size ... for example, we can compare it with 21 male African elephants.


The Bruhathkayosaurus lived in the late Cretaceous period in the Maastrichtian, 70 million years ago in what is now the Indian subcontinent.

Tylosaurus


It belongs to one of the three families of superpredators who know and who have inhabited the Earth: Pliosauridos, Laminidae Carcharodones (the megalodon), and to which it belongs, the Mosasauridae.


The Tylosaurus Mosasaurus species is more bulky and long, with the Hainosaurus, which is closely related. Reached about 50 feet long, and of course, has the essential characteristics of other mosasaurs:
- Adapted to water and reptile related to lizards and snakes today.
- Swimming at high speed because their members had had transformed into flippers and hydrodynamic body shape.
- Huge skull, up to 1.5 meters long ... and very strong high pressure allowing bite.

Certainly, other mosasaurs had a body a bit more robust. But Tylosaurus body allowed him to move with more agility and faster and almost no prey could escape its attack, also to be of a larger size, was fully capable of being the most terrible mosasaur ever.


Might well have reached the 8-ton of muscle. It was definitely one of the few marine superpredators that existed in the Western Interior Seaway during the Late Cretaceous. In fact, the stomach contents of specimens found to indicate that this ferocious Tylosaurus Mosasaurus had a varied diet. A diet that included fish of various sizes, sharks, smaller mosasaurs, plesiosaurs, and diving birds as Hesperornis.


Stygimoloch Spinifer


The image you see, is not an evolved Pokemon, or any other animal picture Japanese manga. That which you see is the drawing, a more or less like a real dinosaur, a dinosaur that is listed as one of the strangest-looking dinosaurs ever found there.

The name of this prehistoric animal is Stygimoloch Spinifer, meaning "thorny devil from the river of death" (intriguing name). He was a member of the family of the pachycephalosaurs, this means that family was the "dinosaurs thick heads" (translation mine). Finally, the most characteristic of Stygimoloch Spinifer was that, his head. His skull was not as thick as other pachycephalosaurs, very well, but has a large number of horns, horns on his head on the muzzle, on the back of the skull and other parts of the face ... On the horns, the experts still do not agree on whether they were to defend themselves, to show off to fight with others of the same species as do the deer, etc.. From what I think so we will agree (experts and mortals ) is that the horns give it looks fantastic, like the dragons of the films. In fact I think the first who drew dragons, were inspired by this animal ... but hey, back to real dinosaur.



The Stygimoloch Spinifer was a herbivore that measured just over 3 meters long and about 2 meters high. He had small front legs but instead the rear were long and strong, so considering that it was agile and quick. In fact, he could inhabit the same ecological niche as a deer or an impala in Africa today ... the only thing that did not live back then lions, but Tyrannosaurus Rex.


He lived in the Late Cretaceous (70 million years ago) in North America. And disappeared probably because of the large meteorite that caused the Cretaceous mass extinction.

Austroraptor

 




The Austroraptor is a close relative to Velociraptor, but larger, about 20 feet long (3 times longer). His name means "thief of the South" (South raptor), such as birds, and do not put this name by chance. In a way, his appearance might remind us old birds, a predecessor to the Raptors next we Know today. His head (over 4 fts) was low, long and streamlined, provided with numerous small and conical teeth. Moreover, according to the markings found in fossils, it was covered with feathers.

This prehistoric animal called attention to the paleontologist who discovered it to see how their upper limbs were in proportion smaller than others of the same gender: their short forearms depart from the condition characteristic of all long arms and their relatives dromaeosaurids avian nearby. This would therefore be a missing link between dinosaurs and modern birds.
  Perhaps (and this is my opinion) is an example of regression, this means that they resumed their oldest species characteristics. As is the case of flightless birds also reduce its wings.

Instead, it was her hind legs which facilitated the classification of this new species, the family Dromaeosauridae or "corridors lizards." By this I mean that was a fast runner Austroraptor, who had strong back legs and he used to hunt their prey.

The Austroraptor lived 70 million years in the late Cretaceous period in what is now South America..

Xiongguanlong, the ancestor of T.Rex


Xiongguanlong, the dragon of Jiayuguan (a city in China) is of utmost importance if we are to understand the appearance on earth Jurassic was the best known of all dinosaurs: Tyrannosaurus rex.

Its dimensions are not overly large jaw crusher or lacked teeth 30 cm long (1,2 ft) but its evolutionary features makes it worth being described as other lucky animals in this blog. Seriously, any prehistoric animal lover should know about this dinosaur.

The Xiongguanlong measured about 6 meters long and nearly 2 meters tall (7 ft), weighing around 300 kg (660 lb) the T.Rex was over twice and weighed 30 times more). His skull was about 50 cm (1,65 ft) long and the snout was long and thin that the T.Rex, more adapted to cut meat to crush bones. But I began to have those morphological features of Tyrannosaurus rex:



A box-shaped skull.
Reinforced temple bones to support the jaw muscles.
A strong spine that holds a large head.
Reduced forelimbs.
A predator might be terrible in its time but was not the biggest nor feared, did not reach the level of predator.



This Tyrannosauroidea theropod dinosaur lived in the Cretaceous between 125 and 100 million years. Keep in mind that most of the family lived in the Cretaceous Tyrannosauroidea ... not in the Jurassic as the movie suggests: Jurassic Park.

And for that matter, so as not to cause further confusion and this time for my culpa.Que the Xiongguanlong is the ancestor of T.Rex, does not mean it's necessarily the direct ancestor or the t. rex is the offspring following, but is useful in determining the overall pattern of evolution tyrannosaurid, is like knowing discovered a missing link in the evolution of T.Rex.


Last image taken from http://ca.bestpicturesof.com/paleoart

Acrocanthosaurus



Without quite knowing why, Acrocanthosaurus lived to the public under the shadow of T.Rex, still a great unknown to most and undervalued its role as a hunter at the time of the Cretaceous in North America and Europe.


About the size of T.Rex, the Acrocanthosaurus was a cousin of Allosaurus and, as this was a hunter specializing in large animals, giant sauropods like Diplodocus weighing 6 or 7 times or Pleurocoelus.
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The name of this lizard Acrocanthosaurus means "thorn lizard high" and indeed, when it was discovered, even mistook him for the BIG SPINOSARUS (King of Kings). The theme of the spines always generates controversy and do not become experts agree: if they were to regulate the temperature, if it was to swim, to show your mood, or to house unions with strong muscles ... too numerous to write about this but we'll see another day.

Speaking of muscles, the Acrocanthosaurus was very muscular and strong, much more than others allosaurids. Something like an Allosaurus largest and steroids. It measured 12 meters and weighed 5.6 tons, and this made ​​him a bit slow *. He ran and ran up to the big sauropods (which is not that they were cheetahs) long necks and hooked to these formidable pulling their strong claws and bite with all his weight down, dropping these titanic beasts.

* It was the weight and slow what they did to specialize in hunting large animals, or vice versa, hunting big beasts Acrocanthosaurus led to larger and more robust. Finally, the case is to specialize in this way produced an end. Forms were disappearing with the big sauropods, the Acrocanthosaurus were increasingly less likely to hunt and smaller dams could more easily escape them. His strength was his undoing.




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