facebook
twitter
rss
account
search
search
 

Ancestor of living 'fossil fish' described

May 3, 2012 at 4:45 PM   |   Comments

DEERFIELD, Ill., May 3 (UPI) -- An ancestor of coelacanths, "living fossil" fish thought extinct until a live one was caught in 1938 off South Africa, has been identified, paleontologists say.

Unlike living coelacanths, which are slow-moving fish with peculiar broad tails, the extinct ancestor had a tuna-like forked tail and was probably a fast-moving, shark-like predator, Canadian researchers from the University of Alberta report in the Journal of Vertebrate Paleontology.

The 3-foot long fish with a massive symmetrical forked tail quite unlike the tails of any other living or fossil coelacanths has been named Rebellatrix, the "rebel coelacanth.

The fossils were discovered on rocky slopes in Wapiti Lake Provincial Park in British Columbia.

Both the shape and the stiffness of the tail fin are unique amongst coelacanths, researchers said.

Because similar tail fins occur today in fast swimming predatory fishes such as tuna or barracuda, Rebellatrix was probably an active predator capable of fast bursts of swimming to catch other fishes living in ancient seas.

The unusual tail evolution may have been a specific response following the Earth's greatest mass-extinction event at the end of the Permian, 250 million years ago, as coelacanths evolved to fill a vacant niche unoccupied by other predatory fishes, scientists said.

"This is an amazing discovery which overturns the age old image of coelacanths as slow moving fishes and shows the resilience of the group to come back in true fighting form after surviving the world's most devastating mass extinction event," said John Long of the Natural History Museum of Los Angeles County, an expert in fossil fishes who was not involved in the study.

© 2012 United Press International, Inc. All Rights Reserved. Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.
Recommended UPI Stories
Most Popular
1
Climate change, sea level rise threaten national monuments Climate change, sea level rise threaten national monuments
2
Study: Chimps are natural born killers Study: Chimps are natural born killers
3
Martian meteorite proof that Mars could host life Martian meteorite proof that Mars could host life
4
Dogs are the favorite food of leopards in rural India Dogs are the favorite food of leopards in rural India
5
Audi gets permit to test self-driving cars in California Audi gets permit to test self-driving cars in California
Trending News
Video
x
Feedback