News From the Field
New fins evolve repeatedly in teleost fish
March 5, 2014
Present in more than 6,000 living species of fish, the adipose fin, which lies between the dorsal fin and tail, has no clear function and is thought to be vestigial. However, a new study analyzing their origins finds that these fins arose repeatedly and independently in multiple species--a striking example of convergent evolution. In addition, adipose fins appear to have repeatedly and independently evolved a skeleton, offering a glimpse into the evolution of vertebrate appendages.
University of Chicago Medical Center
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