Showing posts with label Devonian. Show all posts
Showing posts with label Devonian. Show all posts

JAEKEOPTERUS



Sometimes I like to revel in the oldest prehistoric animals, put aside the great saurian to which we are accustomed to seeing and who are better known and delve me at the beginning of life, dive into the origin of evolution. When existing evolutionary branches were more diverse and where we find primitive animals and, in a way, awaken our imagination.

The Jaekelopterus is a good example. If we read a book of science fiction, books describing other worlds and invented creatures living in it, we could find a Jaekeloptero swimming in its waters.

Brief description of the animal: this prehistoric animal, it is the order of the eurypterids, namely Scorpions sea. Among all species of these ancient scorpions, the bigger the Jaekelopterus.

Its dimensions are tremendous, we are talking about more than 2.5 meters long (just imagine a scorpion 2.5 meters long (82 ft.)  coming through the door of the room by going directly to you ... scares eh?) So great was that it is considered a predator who held one of the highest positions in the food chain....
How they hunted?
Together with those dimensions, hunting is the most amazing of all. The Jaekelopterus had two pincers of no less than about 50 cm  (16 ft.) in two of its appendages that could extend to grab its prey tightly. Close and personal with a rapid expansion of its appendices remained motionless at predated while it was eating it.

This last detail makes us think one thing. We have said that could reach 2.5 meters long (82 ft.). But when his paws and claws extended, the length of this increased to one meter, reaching measuring 3.5 meters long (115 ft.).

However, no one seems to ensure that it was a true predator, and it seems that this animal could get most of their food from the carrion of other dead animals.

As is understood by the name, this animal was aquatic. But it is thought that did not live in seas, but in swamps, rivers, etc ...
He lived in the Devonian, 390 million years ago, when many of the mainland were still together.

Finally, these animals are a bit in no man's land. It is not known exactly whether they are really related to scorpions, with arachnids or the horseshoe crab.

Acanthostega



The Acanthostega is the oldest known tetrapod. Is Ichthyostega predecessor and successor of Tiktaalik. It is of the first vertebrates that poked their heads out of the water to see what had out and hunt insects and arthropods near water. Remember that a tetrapod is one animal that has four legs, and who uses them.

It is the oldest known tetrapod. It was the first animal that had the bone structure needed to walk out of the water. A structure, perfected, was the basis for all other tetrapods (amphibians, reptiles, mammals and birds).

How was this prehistoric animal?


Similar to Ichthyostega, no more than a meter in length and its legs were 8 fingers. And like Tiktaalik, the Acanthostega had a disembodied skull that could move while the body ... Unlike fish.

Like early amphibians, the first ones out of the water, his breathing was a simple combination of lungs and gills.

This evolution firstborn old, lived in the shallow waters of the Devonian, 370-360 million years ago.

A curious animal right?

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.

Tiktaalik



Tiktaalik was primarily the characteristics of a fish, but with the tips forming skeletal structures similar to an arm, similar to those of crocodiles, including shoulder, elbow and wrist. He had the sharp teeth of a predator, and his neck could move independently of his body, it is not possible in other fish. The animal also had a flat skull like the crocodile eyes on the top of the head, suggesting that spend much time looking up, neck and ribs like those of tetrapods, which will serve to support the body and help to breathe through lungs, a long snout can catch prey on land, and a gill opening, in higher animals, would subsequently become heard. Its discoverers felt that, in all likelihood, Tiktaalik flexed its proto-limbs in the main river bed and could have pushed himself to the shore for brief periods. These specimens reached a size of 1.2 to 2.75 meters.

He lived in the Devonian period about 375 million years.

Excellently preserved remains of Tiktaalik in 2004 were found on Ellesmere Island in Canada.

Along with Ichthyostega, Coelacanth and Acanthostega is one of the prehistoric animals that show as was the transition from fish to tetrapod.

For more information:
Wikipedia.
http://www.nodo50.org.

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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