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Craig George is working with Hans ...
Craig George is working with Hans Thewissen of Northeast Ohio Medical University to find out if there is a way to measure hearing damage in whales
Evolution: The Grand Experiment-Official Site | Whale Evolution
Dr. Hans Thewissen, Professor of Anatomy at Northeast Ohio Medical University (NEOMED), is a whale evolution expert.
He is famous for discovering the walking whale Ambulocetus and a nearly complete skeleton of the walking whale Pakicetus (shown in the picture above).
It appeared that Thewissen
had added whale parts (in this case a blowhole) to the areas where he
had no fossil evidence, just as his
former professor had done.
When Dr. Werner began questioning Dr. Thewissen
about the shape of the skull and missing fossil parts, Thewissen
retracted the entire blowhole idea even though he had supplied the world's top museums with skeletons having blowholes.
had reported seven other whale characters of Ambulocetus, but all of these, according to Dr. Werner, are problematic.
said that the cheekbone of Ambulocetus was 'reduced' as in modern whales and dolphins; but, in fact, the cheekbone of Ambulocetus is larger than the cheekbone of a horse.
Finally, according to Dr. Werner, Dr. Thewissen
also retracted his statement that Ambulocetus had a key feature, a whale-like ear bone called a sigmoid process.
Surprisingly, in our interview, Dr. Thewissen
position and suggested that the ear bone of Ambulocetus looked more like a mole rat ear bone.
However, Dr. Zhe-Xi Luo from the Carnegie Museum
and Dr. Thewissen
called the sigmoid process "questionable" and "equivocal."
Dr. Hans Thewissen
Dr. Hans Thewissen, Professor of Anatomy, Northeast Ohio Medical University
will present an overview of the first 13 million years of whale evolution, a period when the ancestors of whales, which looked like tiny deer, became aquatic.
will introduce a variety of early whales, some resembling otters, others alligators or seals.
has conducted fossil digs in India and Pakistan, where he
has unearthed the fossils of the earliest relatives of today's whales.
These fossils provide a powerful way to study evolution.
research also involves the study of how the embryos of whales and dolphins develop their unique shapes.
travels to Alaska to study modern whales and their adaptations to the changing arctic climate.
This program is in conjunction with the exhibition Whales Tohora.
Are you a teacher?
Join Dr. Thewissen
for an Educators' Intro to the Whales Tohora Exhibition at 5 pm.
Preregistration is required through the Science Resource Center by calling (216) 231-2075.
Hans Thewissen, an expert on ...
Hans Thewissen, an expert on early whales, agreed.
Another scenario, he said, is that the whales might have gathered in a lagoon and then an earthquake or storm could have closed off the outlet to the ocean.
"Subsequently the lagoon dries up and the whales die," said Thewissen, a professor of anatomy at Northeast Ohio Medical University.
said the accumulation of so many complete skeletons is "a very unusual situation."
"If this were a lagoon that dried up, you might see signs that ocean water evaporated," such as crystallized salt and gypsum in the rock, said Thewissen
, who is not involved in the research.
In the current issue of the ...
In the current issue of the Journal of Vertebrate Paleontology, Hans Thewissen, Ingalls-Brown Professor at Northeast Ohio Medical University (NEOMED), and his colleagues review recent studies that have used modern genetic techniques to shed light on fossils, and vice versa.
"It is a very exciting time to be an evolutionary scientist.
So many researchers are investigating evolution, either by finding new fossils or by figuring out the genes that underlie changes in evolution.
Now it is possible to combine those two fields and go beyond what each field could have accomplished on its own," said Dr. Thewissen.
says, "For me personally, as someone who has spent most of his
life studying fossil whales, it is very exciting to be able to use information from the development of living mammals, and use it to teach me about how whale evolution happened, 50 million years ago."
Thewissen, J.G.M., L.N. Cooper, and R.R. Behringer.