Silverfish, prehistoric animal still alive.


All prehistoric animal lovers, we like to discover that, although not a Megalodon or a giant short-faced bear, we can delight with the observation of a tiny prehistoric animals still alive, a being that has not changed for 400 million years and for more joy, it is possible that we have at home.

These animals are called silverfish, fishmoths, carpet sharks or paramites, and are on earth so long ago that saw come and go trilobites, Dunkleosteus, at the very Hurdia Victoria, the well-known T-Rex and even our ancestors like Australopithecus.

This is a prehistoric animal in wingless insects have a long, excluding its limbs, about an inch.
Its metallic luster of the body is due to its silvery scales, which appear after the third molt.

He lives in damp and dark, most often in older buildings, or between books and papers at home.

They feed on carbohydrates such as starch or other polysaccharides. They can also digest cellulose, textiles drilling starch, sugar, hair, dandruff, dirt and mildew, books, cotton, linen, silk, including artificial silk, dead insects or even its own exuvia (shed skin) and mites.
Driven by famine, a silverfish may even indulge skin with clothing (leather) and some fabrics made with synthetic fibers. However, like many insects, is capable of interrupting their vital activity for several months without appreciable harm.




His top predator are earwigs, house centipedes and spiders




Anyway, I personally think that seeing this animal is a privilege and a gift, it is also harmless to humans (not like cockroaches), and I find it funny when turning on a light or stop run to the small, dark recesses the bathroom ... Probably been that way (hide and seek food in the dark) and have survived so many predators, so many changes in climate, so many disasters, wars and so many years. So next time you see one and go to step on it, think that this is a prehistoric animal.

Daspletosaurus


THE TERRIBLE carnivorous reptiles. That was the name we put this dinosaur, Daspletosaurus. It was another prehistoric animal Tyranosaurido fierce-looking and although a little smaller than its cousin the famous Tyranosaurio. Even being smaller, this dinosaur was a predator that stood at the top of the food chain and devouring other animals such as large or some Ceratopsidae hadrosaurids (horned Triceratops) of several tons.

Possibly, his name is due to the impression that was taxed in the retina of the paleontologists who discovered it: a huge head of 1 meter with 72 serrated teeth, long and sharp with heterodoncia (specialized teeth). Measuring up to 9 meters long and it is estimated that almost could have reached the 4,000 kg.

A feature to highlight in this prehistoric predator was his strong neck and a strong legs (compared with other similar sized tyranosauridos.

The strong hind legs brought him agility and speed in racing, and a starting power and strength to pursue valuable prey. It was really a terrible carnivore and fast.



On the strength of his neck, holding a skull strong armed indeed, its function was to hold its prey. Since its forelegs were minimal and not very useful, Daspletosaurus used their strong teeth to catch and mortally wound its prey. Grab their prey with a bite bowed numerous sharp teeth and retained and the onslaught endured and the struggles of its prey with its powerful neck.


The Daspletosaurus lived in North America in the Cretaceous period about 75 million years.

In the video below looks like a group of successful practice Daspletosaurus a hunt. (Up to 4.40 min)




Quetzalcoatlus.

One of the first animals that we put in the blog was the big Azhdarchidae. Huge pterosaur (flying reptiles) with a wingspan of 10 meters. Well, now the largest pterosaur know all ... indeed is considered the largest flying animal of history: the Quetzalcoatlus.


The Quetzalcoatlus was by far the largest flying animal. For example, a current condor reaches 3.3 meters (11 ft) , 3.6 meters (12 ft) of an albatross, a magnificiens Argentinavis reached the 8 meters (26 ft) wingspan, large Azhdarchidae reached the 10 meters (33 ft) ... but the Quetzalcoatlus reached 15 meters (48 ft) . And while most current research suggests that reached 12 meters, still the largest flying animal ever.

The most representative species of this genus is the northropi Quetzalcoatlus, a pterosaur, with a similar appearance to other pterosaurs had a long beak, sharp and toothless. With a small head and a ridge height of almost 5 meters (16 ft) when placed standing, weighing 200 kg (450 lb) . To think that 200 kg (450 lb) is a lot for a flying animal, for example, weighs 12 kg (25 lb) condor, so some experts believe that weighed much less ... about 80 kg.


It lived in the Upper Cretaceous (Maastrichtian ago by 68-65.5 million years ago) in North America.



Carcharodontosaurus

The word "Megalodon" means big tooth and its scientific name is Carcharodon megalodon tooth mean much sharp (or sharp). Knowing this, it is easy to know why the name of this prehistoric animal: the Carcharodontosaurus which means lizard with sharp teeth.

An animal with this name can only be a hunter, a predator, why would an herbivore have fangs ...?

Carcharodontosaurus was not a second predator. In fact, the family that was part (Carcharodontosauridae) appeared some of the largest known land predators, such as Giganotosaurus, the Mapusaurus and tiranotitán. All these strong predatory theropods that reigned over other animals in their geographic areas and their corresponding time.

His appearance was fierce, and tanmaño negligible. I could measure up to 12 meters long, weigh up to 4 tons, and 4 meters high. To give you an idea, the T. Rex measured 14 meters long and of course heavier, but has anyone ever think that it was a lizard Carcharodontosaurus hardly any importance in the world of prehistoric predators. Carcharodontosaurus also had one of the largest skulls of carnivorous dinosaurs. And the larger relative to its size. A skull of 1.5 meters, about 10 cm less than the Giganotosaurus, which measured up to 18 meters long. Besides his jaw pressure is estimated at 3.5 tonnes and full of jagged teeth like those of sharks could tear flesh but was protected with scales, so their prey died bled also had sharp claws his hands as hooks butcher to support a victim while its jaws tore.


Other data supporting this was a good predator:

The carcarodontosaurios had a two dimensional view, as any good hunter. They had like a long, muscular legs, and trace fossils indicate that they could run up to 30 km / h, but now this is controversial.



Finally, we should not make myths of T. Rex, Spinosaurus, Allosaurus or Giganotosaurus, because after all other dinosaurs were able to shadow them, as the Carcharodontosaurus.

Carcharodontosaurus lived in Africa during the Cretaceous.

Hainosaurus

You have certainly heard of Mosasaurus, the great predator of the Cretaceous, a fearsome marine hunter was afraid of other creatures of the sea but ... and Hainosaurus? While not believe it, the Hainosaurus belonged to the same family as the Mosasaurus, Mosasauridae the family.


He was also a marine reptile, an apex predator that lived with her ​​relative Mosasaurus.


Hainosaurus dimensions have been debated: Some experts believe that reached 17 m (57 ft) and 13 m (42 ft) change others, but the vast majority agrees to an average size 15 meters (50ft).


This hunter's skull measuring 1.5 meters (5 ft) long. And in his jaws were more than 60 teeth are sharp and hard. Among their prey were fish, turtles, marine reptiles and even smaller sharks.

The hainosaurus had an elongated body that was perfectly adapted to the water to achieve greater agility and speed. They had fins on the sides and curved tail with fins to swim very fast, to reach out and catch their prey without that it can do almost anything.


This prehistoric animal was specially adapted to be in the water, and some of the questions that have their fossils are related to how and where breeding and giving birth to their young, uncertain whether it was viviparous, oviparous or ovoviviparous.


Although little is known of this marine reptile, I hope you discover more about the wonderful Hainosaurus.

Moeritherium, the ancestor of the elephant.


40 million years ago appeared on Earth the first elephants, rather the ancestors of the modern elephant. One of the ancestors called Moeritherium, which means "Moeris beast," which is an ancient lake in Egypt. Not only was the ancestor of modern elephants, was also the forerunner of the mammoth and mastodon, all Proboscidea (order of placental mammals). In addition it is also thought to be related to the manatee or sea cow or also known as Sirens.

The Moeritherium was small compared with an African elephant, the size of a big pig, a vegetarian-bodied, plump and heavy. He had thick legs, long, thin skull. Is believed to have had a rudimentary horn was somewhat flexible like a tapir or the Macrauchenia current. Instead their eyes and ears of the hippopotamus seemed to be placed in the top of the head perhaps for the amount of time remaining in the water of swamps and rivers. It is thought that the same ecological niche occupied in the hippo. But with them and speaking in evolutionary terms, they have nothing to do.



The protofeather or Dinofuzz.,

The protofeathers (or Dinofuzz) ... the great mystery of reptilian scales transition feathers.

What are protofeathers?

The protofeathers are structures shaped keratin hair or bristle and are considered the precursors of feathers.

When did?

Much of all this passionate debate is the date of appearance of the feathers, protofeathers. It is interesting that the oldest fossil
protofeathers are later than the earliest known bird. It makes no sense unless the protofeathers or dinofuzz ​​appeared much earlier (in the Middle Triassic) and therefore would all structures originally present in dinosaurs and their immediate ancestors. Impressions of skin devoid of feathers or protofeathers known (Anatosaurus, Carnotaurus, Tyrannosaurus, etc..) Could be due to a subsequent loss of the outer coating due to the large body mass of these animals (the same reason that the rhinos and elephants have virtually no hair). But this need not be. Anyway ... although I am inclined to this theory, it really is just a theory.

How are the protofeathers?

According to the current expliación: One of reptilian scales ... This is the first spine, then becomes hollow and extends, as it grows, it follows from the skin and forms a cluster of hairs called beards or barbules.

In this video you can see the process of formation of protofeathers.


video

Why are important protofeathers?



For as we said, are the precursors of feathers. The appearance of the feathers is one of the most controversial issues can be found by paleontologists.

Apart from that it is not clear when they appeared, the experts, agree with in the end, why they left feathers: feathers but now used to fly (the most important feature) is considered to formation of these was a simple cold protection system. A coat of hollow scales isolated from the ravages of time.


Why were transformed into feathers?


Protofeathers are known to be used to maintain body heat and cover the body from the cold. And the fossils discovered (or most) protofeathers concentrations were located on the tail and arms. This allowed them to cover her at night and cover the cold while the temperature down ...



It is no coincidence that birds have feathers on the wings larger (called T-shirts or remiges) and tail (tail feathers or rectrices). They were the first to develop, were the first to appear were also exercising more air resistance. An important feature for small arboreal animals, leaping from branch to branch or thieves fast and small eggs.

What were the first to have protofeathers?

There are several examples of theropods (a group of two-legged carnivores, which is the T. Rex or Velociraptor). Some are: Dilong paradoxus, Sinosauropteryx, Shuvuuia, Beipiaosaurus, Sinornithosaurus, etc ...


But not only are the developers of theropods
Dinofuzz ​​protofeathers or, for example there is the Tianyulong, a small herbivore that is casting doubt on its position in the evolutionary tree and it was discovered 2 years ago.

Finally, there are still many questions to solve, finding fossils and discovering new species. A truly exciting topic of prehistoric life on our planet.

Saurophaganax, theeater of saurians.

Saurophaganax, theeater of saurians is a genus represented by a single species of theropod dinosaur alosáurido: Saurophaganax maximus.

This was a predator who was at the top of the food chain of the time. A hunter considered the gender of the Allosaurus, which rivaled the east by the Jurassic reservoirs superior.De titanic fact, Saurophaganax maximus, was greater than any Allosaurus... as a Zhuchengtyrannus. Could grow to 11 meters long (36 ft), 3.5 tons, and nearly 4 meters (17 ft) high ... But some paleontologists experts who have researched their fossils suggest that it could reach up to 15 meters (50 ft)long and nearly 6 tons (as T. Rex) y. .. apart from these data that can help us imagine a similar beast, S. maximus shared a characteristic of other species of Allosaurus: speed. Could grow to more than 10 km / h; nothing compared to a Formula One car but far more titanic than animals that were part of their diet as the Apatosaurus.

If it was a Allosurus or not is not known, but is increasingly more confident that it is not, what we do know the Saurophaganax maximus is: if it looked like the Allosaurus, the bite would be so terrible as these predators ... not good .... even more powerful and effective because it is a large species 3 meters (12 ft) and two tons heavier. We could say that if the Allosaurus was a bull shark, S. maximus would be a great white shark.


The main feature is its maximus Saurophaganax horizontal plate at the base of the dorsal neural spine, this gives a look similar to the typical fantastic dragons have a series of chevrons along the body.

Madtsoia bai

Imagine dragging 3.000 lb of muscle stealthily lurking in the swamps and the darkness of the jungle. A being with a cold stare that shakes because it reflects the very death. I'm talking about THE WORLD'S LARGEST SNAKE AND THE STORY ... And prehistory.

The Madtsoia bai or as it is commonly known "the grandmother of Cow Canyon" is a species of the genus madtsoia and is possibly the largest snake ever found and even bigger than Titanoboa.

In 1931, evolutionary paleontologist George Gaylord Simpson found the fossilized skeleton of a snake in the town of Cow Canyon, located in the southeast of the province of Chubut (Argentina).
This prehistoric animal was a snake constrictor, meaning they hunted their prey by strangulation, not poison, squeezing and squeezing its prey more and more each time the prey exhales the snake tightened until the victim can not recover this vital air and dies by suffocation.

The estimated sizes for this giant snake is between 50 and 65 feets, diameter 2 feets and weighing up to 1.5 tons. For example, the current Anaconda fails, almost never, 8 meters, 35 cm in diameter and 450 lb ... and is the largest in the world.

On the other hand, imagine the animals would be able to swallow this thing of prehistory. If you lived in Argentina Patagonia 90 million years ago and has been extinct for 2 (or so they say), bony part of the Cretaceous and Pleistocene, could engulf prey as Abelisaurus terrible, a great Toxodon or even one of the first cats that Smilodon drinking approached carelessly.

15 m years ago began a process of cooling and desertification of Patagonia, which was gradually shaping the current face of the region as well as climatic and environmental conditions that we know at present.

The giant snakes do not support these changes and became extinct, or in some cases, retreated northward, giving rise to the current species of large snakes.

Allosaurus fragilis.

When I wrote the post of Allosaurus Europeaus, also promised to write about the Allosaurus fragilis, the best-known species whose fossilized bones have more information to the expert paleontologists.


But not only important for the amount of fossil fuels. Anyone who has heard or knows anything about the dinosaur Allosaurus know that this was a T. Rex of his time. It was a prehistoric monster that was in the top of the food chain, a predator with a bite capable of prey animals as large as Stegosaurus and Diplodocus.







Fortunately for the Allosaurus did not have to deal with T.rex (who lived 80 million years later), the Spinosaurus (30 million years later) or Giganotosaurus (60 million years ago). Possibly the only species of dinosaur that could stand up was Saurophaganax that like Allosaurus lived for about 150 million years in the late Jurassic.

Their physical characteristics are:

Length: Nearly 30 feets long.
Height: 13 feets.
Weight: 6000 lb.

(T.rex- 43 for long., 18 tall and nearly 13.000 lb)

Although smaller than T. rex, Allosaurus's body was much the same way, the only notable difference was that his front arms were compared with the body, stronger and longer.

Another feature is that the Allosaurus (some experts believe) reached high speeds ... of course for these sizes of dinosaurs. Reached speeds of up to 6,2 mill / h and this speed could reach any of stalking and its victims.

Once the victim came to them with a bite attack stubborn 70-curved teeth inward dams prevented their escape, lest they (the prisoners) do without the piece of meat that was trapped in its jaws Allosaurus.

Rhamphosuchus

For months we talk about one of the largest crocodiles in the history and prehistory together. We refer to Deinosuchus, a crocodile measuring between 12 (40 ft) and 15 meters long (50 ft), which lived in the Cretaceous dinosaurs that hunted among other prey.

The crocodile you today is possibly the largest crocodile ever. A crocodile with a size that could grow to 18 meters(58 ft). (Opinions vary on the size, some experts say that half to 18 meters and 15 ... in any case would be one of the largest crocodiles.) Called Rhamphosuchus and like other crocodiles, current and extinct expected lurking in the river banks until prey came to drink and then ... zas!. A deadly bite, a fatal bite when caught their prey would not let go until he stopped breathing.

Among their prey might have found a Platybelodon, an ancestor of the elephant, and even a hominid Anisodon ancestor of ours as Gigantopithecus, the largest single story.


A Platybelodon, an ancestor of the elephant, 2 meters (7 ft) high and over 2 tons that even with its enormous weight and strength, could do nothing against this 10-ton crocodile, a mouth of almost 2 meters, 18 meters and one of the Bites more pressure throughout the animal kingdom (almost nothing).

Come on, all animals are herbivores or carnivores, prey or hunter, trembling at the close presence of this great monster, this large predator.

A bit of prehistory.

Everyone knows the prehistory of the mind in which the dinosaurs disappeared about 65 million years. But few people know another story even more fascinating and more importance for what is life on land, but especially and more specifically, to us humans. It was not an isolated event but a chain of events, a struggle between forces of evolution among prehistoric creatures that ended with one victor, our ancestor ......... The story begins:

500 million years ago.


So far life in the prehistoric seas, oceans before the beginning of the Cambrian period,
consisted of single-celled or multicellular creatures (many
cells, but all the same) soft body, which they obtained their food by filtering the water around them, or feeding on bacterial mats (dense colonies of bacteria) on the ocean floor.

I will not go into details but then gave a very important place, which is known as the Cambrian Explosion, say it is from this date (500 thousand years) when the three-edged mother will result in all other species we know and that interaction
between them, set up, the situation now is the arthropods, molluscs and vertebrates (the group we belong to).

Well, at that time, life beyond the seas was unknown, and the seas and oceans were then inhabited by beings of strange shapes as the famous trilobites and other less friendly as Anomalocaris (left) or Hurdia Victoria (the latter were the top predators of the time). These three species were among the arthropods. The dominant and most numerous group that reigned on molluscs (its variety was insignificant) and vertebrates.

In fact, the Cambrian vertebrates were a small and unimportant. For example, while Victoria Hurdia reach 50 cm or up to one meter Anomalocaris, the

representative of the larger vertebrates that was Pikaia (pictured right) did not exceed 5 cm
length. Come on, that our ancestor was a true miniature land of giants.


The pikaia our ancestor, was long, small, light having a backbone instead of shell but it was also the major arthropod prey. He devoted himself to hide in the care of arthropods and eat the waste and the remains of prey left by large predators battleships were mainly scavengers.

Nothing seemed likely to change, the arthropods dominate the land and seas over the millennia, eating and leaving decimated vertebrates, thus reducing the possibility of not only our species but also birds, dinosaurs, fish and other mammals, may appear in the future. But conditions changed.

450 million years ago.


In the late Ordovician period (the next to the Cambrian period) was the second largest extinction of life on Earth history, eliminating 85% of the species.

A global ice age that froze oceans and seas


covered them with a blanket of 800 meters of ice and snow had catastrophic consequences for the life of this era. The lack of light and the intense cold was killing larger species and more specialized, bone arthropods. This led to the other two groups (vertebrates and molluscs) may develop: vertebrates evolved and appeared larger scavengers such as conodont (about 10 cm, right image). But they were vertebrates which rose to the position of the dominant group, but molluscs. The supremacy of vertebrates was cut again, but in this case by the large mollusks.



Now the predators were large molluscs such as Ortocono (left)

and Nautiloidea. And they dominated the other groups until they took another step, one giant leap in the way of the evolution of arthropods came ashore.


On land they had no predators, and eventually took the opportunity to grow and multiply. There were big and strong and the seas again to reconquer. And they succeeded. Arthropods were Jaekelopterus rhenaniae most important ancestors of scorpions and giant like Pulmonoscorpius.

Over time, the move gave them the advantage on mollusks to arthropods and vertebrates (leaving ground) would also be a fatal mistake that would destroy them.

375 million years ago.

Gradually, over the millennia, vertebrates were going to land, a land that was populated with a number of plants that helps to oxygenate the atmosphere and produced the right conditions for our ancestors to develop.


Shellfish centuries ago who had returned to background. In contrast, on land, vertebrates were developed only arthropods and began to exceed the size, strength or agility of the arthropods. The last battle was about to begin.

On the one hand were the arthropods were strong but had a weakness: its outer armor. They had to grow as the animal grew. If the animal was too big armor, and thus increasing the animal's weight. Could weigh as much that came a moment that was counterproductive in an evolutionary sense. At best, could reach a size of 3 meters.

On the other side were the vertebrate ancestors. Animals that could grow larger without becoming too heavy to be sustained. Vertebrates, thanks to its design, its backbone, they could better adapt, develop better, evolve ... and all this without becoming heavy tanks.

250 million years ago.

The reign of the arthropods are gone forever. And with this came the dinosaurs, birds, fish ... y.

.. us HUMANS.

Pliosaurus Vs Plesiosaurus.

Pliosaurus and Plesiosaurus are two distinct genera of the same family or order of marine reptiles that lived in prehistoric times. Now there are few giant marine reptiles, arguably the most important the marine crocodile with more than 6 feet long, but that was nothing compared with the members of these two genres that were true sea monsters. Here are some.

Pliosaurus.

They were usually large predators with large jaws and well armed, short necks. Some examples are:

Kronosaurus A marine reptile which, like other Pliosaurus, had short necks but strong. Their jaws measured 2.5 meters long fang-filled and the length of his body could be up to 12 feet and weigh 15 tons. Some call it the Rex Marine.







Liopleurodon was another Pliosaurus but with their own families, the Liopleurodon was a great swimmer, a lively marine predator,
with a shape similar to but even larger Kronosaurus. Grow to 27 meters and weigh 150 tons, was able to pursue quickly and for long periods at their prey. With jaws 3 meters long and with teeth to tear to twice as long as those of a Tyrannosaurus Rex. (30 cm long)


PREDATOR X. A curious name for
an animal surprising. It is believed that X was a Liopleurodon Predator, a large skull and huge jaws, its dimensions were similar, maybe a little smaller: a 3-meter jaw full of teeth over 30 cm long and it is
believed, was an animal that had more bite force among all known.











Plesiosaurus.

Large predator fish from four large fins and long necks characteristic of animal facilitated its kind that raises its head to breathe. The best known are:




Elasmosaurus. About 15 meters long, which were 8 meters long neck and the rest is for your body. With a weight of 9 tons, was a heavyweight of the oceans of the Cretaceous. And although it was stylized and rather graceful, was a super-predator of the time. Although he was no match with any of the three Pliosaurus we've seen (like the Predator X Kronosaurus or who were his rivals and could live at the time)





NOTHOSAURUS. Another known Plesiosaurus, possibly one of the first of its kind. Not exactly a Plesiosaurus, but was (or any of its branch) who gave birth to this genre. It was "little" about 4 meters long and less than a ton. With strong long teeth that bite and to catch fish served with a quick bite.



CRYPTOCLIDUS. Possibly the second most popular after Elasmosaurus Plesiosaurus. Was over 8 meters long and weighed 8 tons. His neck, long as all Plesiosaurus was more robust than others, however its elasticity was lower. This being a predator rather Bland. Hunted large prey and not be satisfied with simple and small dams. However, it was an animal whose size had very few enemies.


Now, after the abstract, let's see some videos:






The Platybelodon, an ancestor of the elephant.

The Platybelodon was one of the ancestors that gave rise to modern elephants, though not unique, but so is the strangest appearance.

The Platybelodon was herbivorous, and like the current hippos, spent much time in the swamp water where they feed on aquatic plants. One of the most curious features of this animal from the Miocene was his two bottom teeth shovel-shaped. Two teeth were disproportionately long and wide, however, the teeth (protruding into the mammoths, mastodons and elephants) were small and insignificant.
Another use of these teeth is lower than was to grab the trunk and branches, serrated rubbing against the lower teeth to cut the tree.

Robust and heavy as a small elephant, it can weigh over a ton and a half and could grow to 2 meters high. As I said before, lived during the Miocene, from 15-4 million years, and lived in Africa, Europe, Asia and North America. Although it thrived during his time, did not survive beyond the Miocene. Although no one knows exactly why he died.
In any case, this curious animal, this ancestor of the elephant, the mastodon or mammoth, is an example of the diversity and richness of fauna in prehistoric times.

Brontornis burmeisteri

A fearsome carnivorous birds and greatest of all time was the Brontornis burmeisteri. A flightless bird belonging to the subfamily Brontornithinae, which rivals the size of titanium-prehistoric other birds such as the family of Phorusrhacidae (known as "Terror Bird") or other more current and Dromornis (known as the "elephant bird").

The Brontornis burmeisteri was first introduced in the subfamily of "Terror Bird" and it is because their physical characteristics were similar for its large size and predatory lifestyle, and more specifically introduced in the subfamily Brontornithinae that contained very large and stout forms.

Had a height of almost 3 meters and its weight could reach 500 kg. He had some strong legs, able to tear the skins of their prey with a single blow. To get an idea: we can look at the Cassowary bird-like prehistoric currently living in Australia and New Guinea and is able to kill people with their claws. It measures half a burmeisteri Brontornis and herbivore.
The prehistoric bird lived in what is now called the Patagonia (South America). Due to the volume, is likely to have a lifestyle between an ambush predator and prey actively chasing, jumping on her and shot down by the strike force after a short chase.
Was the dominant carnivore during the Miocene Patagonia, being able to kill even large animals like elephants and the predator Thylacosmilus Astrapotherium (a saber-toothed marsupial).

Simply fascinating.

Nephila Jurassica

What is the largest known spider in prehistory? I guess those with arachnophobia do not want to know. But for everyone else, this question is no longer, at least, interesting to know.

Currently, the spider named Goliath is larger and heavier there. You can reach 30 cm in length with legs extended, although poisonous, is not fatal.


The fossil ever found largest spider is the Nephila Jurassica. A spider bigger than Goliath. Each leg was 15 cm and its body (the females who were older) had a thickness of up to 12 cm. We extended that could reach 42 cm easily.

Nephila Another curiosity is that the oldest fossil spider found. And it was in April 2011 when they discovered their fossils in what is now China.

Another curiosity of this spider is that their fossils belong to the Jurassic and the Carboniferous (when there were large insects that increased much in size by the lack of predators and the high concentration of oxygen in the atmosphere). But hey, that does not mean they do not exist. In fact we think that existed when the land was a continent, Pangea, 1000 million years ago.

Finally, little is known of Jurassica Nephila, sure we'll learn more over time.

Baryonyx "heavy claw. "



As put in the post title, Baryonyx means "heavy claw. " "Heavy Claw"because its huge claws slashed to 35 cm long (1 ft) perforated skin of other dinosaurs, their prey, unable to prevent the tear resist them. "Heavy Claw"because its forelimbs were strong with powerful muscles used both to support and move to attack their prey.

Depending on the shape of the hip, suggests that to move at high speed using all four legs, but at rest or attack was on a biped.

The long neck was very inflexible and had no S-shape of many other theropods. The skull was inserted at an acute angle and not straight, as is common in similar dinosaurs. The large jaws were uniquely crocodilian in appearance and had 96 teeth, double most of his relatives. 64 of these teeth were located in the lower jaw and 32, longer at the top. It is possible that the nose has a small ridge. The upper jaw had an acute angle near the snout, a feature seen in crocodiles that helps prevent the prey from escaping.

The Baryonyx was about 9 (30 ft) meters long and weighed nearly two tons and 4 meters (12 fts) high. FIRST This dinosaur was a predator, although its features is thought that large numbers of prey were aquatic animals. The teeth of his jaw that prevented their prey bite out of her with his huge claws and drew water for prey.

The Baryonyx lived in what is now Europe 125 million years ago (Cretaceous).

BY THE WAY IT IS OF THE SAME FAMILY Spinosaurus. (Spinosauridae)


Kronosaurus.

Inside family of animals Pliosauridae are as terrible as the Liopleurodon or Predator X, marine predators of enormous size with huge heads and huge teeth. Within this group, the third in size (not so small) was the Kronosaurus. Its name means "the lizard of Cronos" (Cronos in Greek mythology was the leader of the Titans).

The Kronosaurus came to measure up to 12 meters (40 feets) and weigh 15 tons. To give you an idea: a whale comes as much up to 9 meters long (30 feets) and at most 6 tons. Another comparison: the skull of a whale "only" is 1.5 meters (5 feets), in contrast, had a skull Kronosaurus 2.7 meters (10 feets) ... Few carnivores were these dimensions and these weapons so deadly.The Kronosaurus had long, sharp teeth, not serrated. Peculiar and distinctive teeth that have made ​​it easier to differentiate between fossils and they are of a Liopleurodon or Kronosaurus.
The Kronosaurus was probably the apex predator of the time. No other animal could stand against him and had to flee if they did not become their prey. Have even found fossilized skeletons of the long Elasmosaurus, a predator of 14 meters.
Fortunately for the Kronosaurus, during the time he lived, Lower Cretaceous, there were his cousins ​​Liopleurodon or Predator X, who disappeared for more than 50 million years before the appearance of Kronosaurus.
Finally, the Kronosaurus, lived in the prehistoric waters which now include Australia and South America.

Megistotherium


The Andrewsarchus or Androsarcus, was considered the largest carnivorous mammal history, but that position was occupied not alone. Along with this there is another giant carnivorous mammal, called Megistotherium (and some experts say it could even be larger than the Andrewsarchus). The Megistotherium was a terrible predator, a predator who struck fear Miocene to the titanic mastodons (found fossilized bones of mastodons with Megistotherium marks indicating that hunting for food).
The Megistotherium belonged to the family of Hyaenodontidae, a family of large predators, strong, aggressive and courageous. Predators that were in the top of the food chain before the mega saber-toothed cats like, or the greatest, the cave lion.
The Megistotherium lived in what is now Europe, Africa and Asia. As large as the current bison, weigh up to 1500 kg (3300 lb) and a height to the shoulders of more than 1.5 meters long and 3.5 (a white bear almost never reaches 1000 kg (2200 lb) and is 2.5 meters long). The dimensions of the skull were Megistotherium up to 1 meter long (similar to Androsarcus) and his jaw with a force of enormous pressure, harbored very powerful teeth can grind the hardest parts of prey such as bones or hooves. Do not forget that the family is synonymous Hyaenodontidae hyena's tooth, and these (the hyenas) are known for the strength of their jaws and teeth trituratodo. To get an idea, your name, Megistotherium, means "the biggest beast crushed bones."
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