Reef-building glass sponges were once thought to have been extinct for 100 million years. But a new live cluster of the organisms has been discovered off the west coast of the US – only the second known to exist.

Furthermore, unlike the other known glass sponge reefs in Canada, the US reefs appear to be fuelled by methane.
...
The team were stunned to find large amounts of methane gas seeping out of the nearby seafloor, and even more surprised to find that the reefs appear to be fuelled by the gas. Specialised bacteria consume the methane, and the sponges suck in the bacteria.
http://www.newscientist.com/channel/life/dn12390?DCMP=NLC-nletter&nsref=dn12390

Linked from http://www.junkscience.com/