New giant clam species discovered
A new species of giant clam has been discovered in the Red Sea.

The fossil record suggests that, about 125,000 years ago, the species Tridacna costata accounted for more than 80% of local giant clams.

The species may now be critically endangered, researchers report in Current Biology journal.

The scientists believe their findings may represent one of the earliest examples of the over-exploitation of marine organisms by humans.