The mystery mollusk appears to descend to the seafloor to spawn. MBARI researchers observed some animals using their muscular foot to attach to the muddy seafloor in order to release their eggs.

The muddy sea floor along the coast of eastern Brazil may appear barren and lifeless. But buried in the squishy sediment is a long, wriggly creature — and a new species. “The Moringuidae is a ...

But with the Pacific Ocean’s seafloor amounting to 165 million square ... “It has been easy to think of it as an endless muddy wasteland, a barren marine desert where there is little of ...