Animals Living Without Oxygen Discovered for First Time
By Charles Q. Choi, LiveScience Contributor
Animals that live without oxygen have been discovered for the first time, deep under the Mediterranean Sea.
A wide variety of single-celled organisms that live anaerobically, or without oxygen, had been found in the past, usually deep underwater or deep underground. But researchers had not found a multi-cellular or metazoan animal that did so until now — the giant tube worms that live by hydrothermal vents, for instance, rely on dissolved oxygen.
See: http://www.livescience.com/animals/metazoan-loriciferans-ocean-100407.html
