Ancient Shark Ancestors Revealed in New Study
Scientists are now closer to understanding the evolutionary origins of sharks. X-ray images of a sharklike fish discovered in 2003 suggest the species is indeed a transitional species.
The discovery suggests the earliest ancestors of moderns sharks were acanthodians, a group of sharklike fish that lived during the Denovian period, between 420 and 360 million years ago.
Understanding how and when sharks emerged from the larger fish family has proven difficult for paleontologists.
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