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Tue Nov 17, 2020, 07:53 AM

Paleontologists Uncover Three New Species Of Extinct Walruses In Orange County

https://phys.org/news/2020-11-paleontologists-uncover-species-extinct-walruses.html?fbclid=IwAR1pr6WFnxk_PyClQN0pj8bSNMjmRIbfzlVx9OQjQMbeWSG6DCMonlCEgjI



Millions of years ago, in the warm Pacific Ocean off the coast of Southern California, walrus species without tusks lived abundantly.

But in a new study, Cal State Fullerton paleontologists have identified three new walrus species discovered in Orange County and one of the new species has "semi-tusks"—or longer teeth.

The other two new species don't have tusks and all predate the evolution of the long iconic ivory tusks of the modern-day walrus, which lives in the frigid Arctic.

The researchers describe a total of 12 specimens of fossil walruses from Orange, Los Angeles and Santa Cruz counties, all estimated to be 5 to 10 million years old. The fossils represent five species, with two of the three new species represented by specimens of males, females and juveniles.

Their research, which gives insights on the dental and tusk evolution of the marine mammal, was published today in the Journal of Vertebrate Paleontology.


~more at link


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