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Hammerhead shark 'twin' means species is rarer than formerly thought http://apocadocs.com/s.pl?1332864874
Scientists recently confirmed that endangered scalloped hammerhead sharks have a fishy twin -- a newfound species, still unnamed, that is distinct, yet very closely resembles the threatened sharks.
The case of mistaken identity indicates that scalloped hammerhead sharks are even more scarce than once thought, according to some researchers.
Since it's very hard to tell the two species apart -- only differences in their DNA and number of vertebrae reveal their true identities -- it's likely that previous assessments of scalloped hammerhead sharks exaggerated their numbers because the counts likely included the look-alike sharks.
"It's a classic case of long-standing species misidentification that not only casts further uncertainty on the status of the real scalloped hammerhead, but also raises concerns about the population status of this new species," Nova Southeastern University Oceanographic Center professor Mahmood Shivji said in a statement.
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[Read more stories about:
predator depletion, sixth extinction, endangered list, overfishing]
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