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:

Triops cancriformis. The oldest animal in history.

This animal is a Triops cancriformis, is considered the oldest prehistoric animal still exists. It is truly a living fossil appeared on earth 200 million years ago (Triassic).
The discovery of this species was by accident while researchers at the University of Glasgow mud collected for further experiments.
The crustacean Triops branchiopods cancriformis are some belonging to the order of Notostraca. Receive various common names, such as turtles or tortuguetas.
The Triops has three eyes, two compound eyes internally and naupliar eye in between, a flattened oval shell that covers the head and body segments bearing appendages. Found at the bottom of ponds and lakes, where they move with the belly down. In case of shortage of oxygen, it may swim belly-up on the water surface, are omnivores, and dig into the bottom of the puddles in search of food. Their diet is based on plankton, insect larvae, worms and even tadpoles when they are weak. You can also watch Triops cannibalism during moulting of the shell as they are more susceptible to predation.

Its life cycle is very fast and is perfectly adapted to drought. Eggs buried in dry mud can withstand heavy frosts during the winter and hatch in 2 or 3 days with the humidity of the first rains, but is required a minimum temperature of 23 degrees centigrade for it. Triops youth, with an omnivorous diet, begin feeding frenzy around what they find. Navigate through the bottom digging in the mud and prefer to feed on plant detritus but if this scarce eat tadpoles, conspecifics artemia or when moving the shell and are more fragile. Reach a height of 10 cm and grow old and die before the month and a half of all offspring leave they can. If males are scarce, as is usual, the females can reproduce by parthenogenesis without the collaboration of these. The eggs can travel in the mud that sticks to the legs of the birds that visit their ponds and so can spread throughout its range (Europe), plus they can remain latent for years.
They are fairly easy to breed in captivity and there are virtual shops on the internet that sell bags of eggs to keep them in aquariums.

Do not you remember the Paradoxides Davidis?
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