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Post Info TOPIC: Ancient relative of horses, rhinos originated in India more than 50 million years ago


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Ancient relative of horses, rhinos originated in India more than 50 million years ago

Ancient relative of horses, rhinos originated in India more than 50 million years ago, fossils show

Finding sheds light on the evolution of this group of animals

Shawna Williams /  November 20, 2014Posted in Science+TechnologyTagged anatomyarchaeology

An artist’s depiction of Cambaytherium thewissiIMAGE: ELAINE KASMER

Working at the edge of a coal mine in India, a team of Johns Hopkins researchers and colleagues have filled in a major gap in science's understanding of the evolution of a group of animals that includes horses and rhinos. That group likely originated on the subcontinent when it was still an island headed swiftly for collision with Asia, the researchers report today in the online journal Nature Communications.

Modern horses, rhinos, and tapirs belong to a biological group, or order, called Perissodactyla. Also known as "odd-toed ungulates," animals in the order have, as their name implies, an uneven number of toes on their hind feet and a distinctive digestive system. Though paleontologists had found remains of Perissodactyla from as far back as the beginnings of the Eocene epoch (about 56 million years ago), their earlier evolution remained a mystery, says Ken Rose, a professor of functional anatomy and evolution at the Johns Hopkins University School of Medicine.

Rose and his research team have for years been excavating mammal fossils in the Bighorn Basin of Wyoming, but in 2001 he and Indian colleagues began exploring Eocene sediments in Western India because it had been suggested that perissodactyls and some other mammal groups might have originated there. In an open-pit coal mine northeast of Mumbai, they uncovered a rich vein of ancient bones. Rose says he and his collaborators obtained funding from the National Geographic Society to send a research team to the mine site at Gujarat in the far Western part of India for two weeks at a time once every year or two over the past decade.

The mine yielded what Rose says was a treasure trove of teeth and bones for the researchers to comb through back in their home laboratories. Of these, more than 200 fossils belonged to an animal dubbed Cambaytherium thewissi, about which little had been known. The researchers dated the fossils to about 54.5 million years old, making them slightly younger than the oldest known Perissodactyla remains. But, Rose says, the findings provide a window into what a common ancestor of all Perissodactyla would have looked like.

"Many of Cambaytherium's features, like the teeth, the number of sacral vertebrae, and the bones of the hands and feet, are intermediate between Perissodactyla and more primitive animals," Rose says. "This is the closest thing we've found to a common ancestor of the Perissodactyla order."

Cambaytherium and other finds from the Gujarat coal mine also provide tantalizing clues about India's separation from Madagascar, its lonely migration, and its eventual collision with the continent of Asia as the Earth's plates shifted, Rose says. In 1990, two researchers from Stony Brook University, David Krause and Mary Maas, published a paper suggesting that several groups of mammals that appear at the beginning of the Eocene—including primates and odd- and even-toed ungulates—might have evolved in India while it was isolated. Cambaytherium is the first concrete evidence to support that idea, Rose says. But, he adds, "it's not a simple story."

"Around Cambaytherium's time, we think India was an island, but it also had primates and a rodent similar to those living in Europe at the time," he says. "One possible explanation is that India passed close by the Arabian Peninsula or the Horn of Africa, and there was a land bridge that allowed the animals to migrate. But Cambaytherium is unique and suggests that India was indeed isolated for a while."

Rose said his team was "very fortunate that we discovered the site and that the mining company allowed us to work there," although, he added, "it was frustrating to know that countless fossils were being chewed up by heavy mining equipment."

When coal extraction was finished, the miners covered the site, he says. His team has now found other mines in the area to continue digging.

Other authors on the study were Luke T. Holbrook of Rowan University, Rajendra S. Rana of Garhwal University, Kishor Kumar of the Wadia Institute of Himalayan Geology, Katrina E. Jones and Heather E. Ahrens of Johns Hopkins University, Pieter Missiaen of Ghent University, Ashok Sahni of Panjab University, and Thierry Smith of the Royal Belgian Institute of Natural Sciences.



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So this indeed one more evidence contrary to AIT. The colonialists worked hard to make the natives believe that they were invaders from outside, who had invaded using horse - and that there was no horse in India before the "Rig-Vedic" period. RIP to those who believe in Dravidian race theory.

This is in response to Dr Romila Thapar.
As far as horses go, there are at least two prehistoric cave paintings in Adamgarh that are horses - not boar, not deer, not cattle. See Dr Sushila Pant in CSC volume I,Part I, page 222. Even more interesting is this article in Nature It says that the modern day European genome is derived from 3 major ones- the blue eyed huntergatherers @ 7000BCE, the brown eyed herders and farmers from the Near East, post 5000 BCE and the Siberian tribes @2000BCE. Perhaps Dr Koenraad Elst needs a relook, even tough he is based only on protoPIE..

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