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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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ScienceShot: The Corvette of Coelacanths
2 May 2012 3:00 pm
Paleontologists have long thought of the coelacanth as a stodgy old slowpoke: Two modern-day species of the fish—considered living fossils because of their remarkable similarity to ancient coelacanths—typically swim in a slow, almost dawdling manner. As a group, coelacanths had apparently kept the same basic body plan for hundreds of millions of years. But now, researchers have found fossils of a sleeker coelacanth—one that likely was a speedy, shark-like predator in the ancient seas west of the supercontinent Pangaea about 240 million years ago. Unlike all previously known specimens, which have fleshy, three-lobed tails fringed with flexible fins, the new species (artist's reconstruction shown) had a stiff, crescent-shaped tail like modern-day tuna and barracuda, both of which are famed for their speed. The team has dubbed the new species Rebellatrix divaricerca, "the rebel coelacanth with the forked tail." Although more streamlined than previously known coelacanths, Rebellatrix, which the researchers estimate grew to reach at least 1.3 meters in length, was more thick-bodied than today's tuna and, therefore, probably slower. The new specimens, described in the May Journal of Vertebrate Paleontology, may mark the first species in a yet-to-be-discovered trove of coelacanth diversity, the researchers say. Or, the Corvette of coelacanths may have evolved to fill an ecological niche left vacant when more than 95% of the ocean's species disappeared in a mass extinction about 252 million years ago.
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