Friday, April 15, 2011

Another transitional form unearthed

From the American Museum of Natural History:
Paleontologists from the American Museum of Natural History and the Chinese Academy of Sciences announce the discovery of Liaoconodon hui, a complete fossil mammal from the Mesozoic found in China that includes the long-sought transitional middle ear.
Reminds me of Yanoconodon allini. If I understand correctly, the chief difference between the ear structure of the two species is that Meckel's cartilage is still attached to the jaw in Y. allini, but has detached from the jaw in L. hui—a fine gradation indeed.

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