How did the jaw make the evolution of the fish

If you are reading this phrase, you may have a fish to thank. The fish were the first animals to make jaw. They mainly use their jaws, but also for defense, such as tools – such as eating harsh food or making open food. The jaws are a trait that scientists believe that the evolution of the evolution has been given to us, including us.

Now, a study from the University of Michigan has revealed that a rare group of fish has enjoyed the diversity blast about 35 359 and 423 million years ago called Lobby Fund Fish. He was a particularly diverse group that consisted of many species that have new inventions in jaw and feeding methods. On the contrary, at that time, other large groups of fish, ray made of fishes, had jaws that were very slowly developed.

It is surprising because at any time, several million years later, their evolution was stopped. The most famous in these “living stakes” is the colakant, once considered extinct, but in 1938 she was discovered in the deep sea by a famous science woman, Marjouri Corteen Latimer. Today, only eight species of lobby -powered fish are identified by scientists. On the contrary, ray -made fish today contains about 333,000 species and contains about any fish you can think about, from gold fish to bass from sea horses.

The study headed by the UM Post Documentary Researcher Emily Traveler, published in the journal Existing organisms.

The study indicated the importance of searching for ancient foam records to discover new information about the evolutionary process, the Traiver said. They did not expect that they would look at such a disparity in the evolutionary power between the lobby fishes and the rays. This is something that is not known for the fossil records of Silorian and Divine Fish.

“When you are looking at evolution, you can learn a lot from seeing the past,” said the Traiver. “Without a fool record, we would have no idea of ​​the overturning role.”

The age of the fish

Although scientists have long been suspicious of the role of jaw in the evolution of the jaw, it had little work that compared the evolution of the jaw to the early fish. The authors of this study examined 3D models with 86 different types of CT scan data from Silver and Dunyan periods, even trees. They found that lobby -connected fish, lung fish and colakant, in particular, show the fastest rates of change and the most innovation in the jaw shape and function.

“This is a really wonderful result, mainly because the lung fish and colakanthas represent only eight living species today, the jaw diversity is not running too much. However, if we look back in more than 400 or more millions of years, we look more wonderful, more wonderful, and more wonderful. The species. “

To determine this, the research team made every 3D model digitally mapped every 3D model to examine the jaw form and function of the jaw, or when the fish was cut a bit.

“Basically, the mechanical advantage of the jaw, the power of cutting is equally strong,” said the Triver.

The research team found that the shape of the lung jaw had really begun in the early Dunnan era. Their jaws with heavy muscles are large and obese. This gave them the ability to eat tough shells like early words and Christians.

“With their really heavy jaws, they were able to eat really hard,” said the Traiver. “We think this new food strategies may need to shape the jaw, and that some of these major innovations are associated with their ecosystem during the time.”

Rafael Reva Vega, First Author and the Recent UM Doctoral Graduate, Collect CT Scan Data and visited the museum to make an additional 3D scan of full lobby fund fish fossils for his dissertation. He then mapped the key properties of the jaw to test “adaptive radiation”, or rapid diversity of animals due to changes in his environment.

Raver Vega was influenced by the disclosure of research that every fish group was experiencing “a unique evolutionary moment” in its ancient past.

He said, “Some fish were making their jaws diverse rapidly in shape and size, just after they did not necessarily change after filling a special niche, others had such features of shapes and size, and still did not have the same shape like others, but they would not be changed until after the transfer to Earth.”

“This is an excellent example of how as long as they experience proper evolutionary stress, how to find innovations in shape, shape and function through different fish groups.