Extinct Porpoise's Underbite Was Unlike Anything Seen In Other Mammals

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Extinct Porpoise's Underbite Was Unlike Anything Seen In Other Mammals Empty Extinct Porpoise's Underbite Was Unlike Anything Seen In Other Mammals

Post by groomsy on Sat Mar 15, 2014 3:59 am

A new species of extinct porpoise kept a stiff bottom lip, fossils reveal. Though closely related to living porpoises, Semirostrum ceruttii (artist’s illustration above), named for its finder, Richard Cerutti of the San Diego Natural History Museum, has a mandible shape never before seen in mammals. Its bottom jaw protruded 18 cm beyond the top one, making up 40% of the beak. Researchers found the specimen (inset) in rock formations along the California coast estimated to be between 1.6 million and 5 million years old.

http://www.huffingtonpost.com/2014/03/14/extinct-porpoise-underbite-mammals_n_4963585.html?ref=topbar
groomsy
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