Oxygen-Free Animals Discovered―A First
Deep in the Mediterranean, scientists have discovered the first complex animals known to live without oxygen.
It was previously thought that only viruses and single-celled microbes could survive without oxygen long-term.
http://news.nationalgeographic.com/news/2010/04/100416-oxygen-free-complex-animals-mediterranean/
BioMed Central | Full text | The first metazoa living in permanently anoxic conditions
http://www.biomedcentral.com/1741-7007/8/30
