Found fossilized specimen of the oldest shrimp


10/11/2010

Professor Feldman Rodney (Rodney Feldmann) and his colleague, Professor Cary Schweitzer (Carrie Schweitzer), from the Department of Geology at the University of Kent reported the opening of the ancient to the present time in the world. Shrimp age nearly 360 million years old and was found on a rock in Oklahoma. Amazingly, even the muscles preserved fossil. The study of fossil will be published by scientists in the Journal of Crustacean Biology.

"The oldest shrimp to this discovery was considered shrimp from Madagascar" - recalled Feldman. "This creation was a bit younger, and being at the age of 245 million years, making the shrimp from Oklahoma 125 million years old."

The fossil shrimp, about 7.5 centimeters in length, was discovered by paleontologist Royal Maps of Ohio University and its students. Professor Feldmann and Schweitzer named the fossil after him: Aciculopoda mapesi.

The discovery is also one of the two most ancient species of decapod, which include shrimp, crabs and lobsters. Other fossil relating to the form of decapod - Palaeopalaemon newberryi - the same age, were found in the states of Ohio and Iowa. "The shrimp from Oklahoma might, therefore, be representative of the most ancient species of decapod on earth" - explained Feldman.

This fossil is a very important thread in unraveling the evolution of decapods. Nevertheless, further excavation and opening needed. "The common ancestor of the two species likely to be found in rocks that once formed the ancient continent Lawrence" - suggested Schweitzer. "Currently, these rocks can be found primarily in North America and Greenland. Who will search for them? Perhaps one of the many amateur collectors, who often graciously donate specimens for science."

Description of fossil is not only remarkable because of his age, but also because of the extent of its preservation. In this case, the muscles involved in the formation of the tail, were well preserved. It is extremely rare among minerals. Feldman suggested why the muscles are still visible: "When the animal died, it remained lying on the seabed." "The muscles as a result of preserved thanks to a combination of acidic waters and a low oxygen content," - he added.

Shrimp lived in deeper waters of the ocean where the currents were too weak to destroy the animal. Other creatures that are found in the same rock, is an extinct species of ammonites (ammonites), nautilus (nautiloids), arthropods (brachiopods) and sponges.

Original: Sciencedaily Translation: M. Potter


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