Scientists Discover Animals That Can Live Without Oxygen

By Meera Dolasia on April 10, 2010

Barring a few known species of single-celled bacteria, scientists have maintained that all living organisms need oxygen to survive. Now, some marine biologists believe that they may have discovered a species of metazoa or multi-celled animals, that can survive without O2!

The three species of Loricifera, were discovered by a team of Italian researchers in the marsh sediments of the L'Atlante basin in the Mediterranean Sea. Considered to be one of the harshest and most extreme environments on Earth, the area, which lies 10,000 feet below the surface, is comprised of salt brines so dense that it does not mix with the oxygen-containing waters. While the researchers have known and pulled some single-celled organisms from the region during prior expeditions, this is the first evidence of a living multi-cell organism surviving in an anoxic or oxygen-free environment.

The sub-millimeter long animals that resemble tiny cups with tentacles sticking out, are similar to mud dragons, except that they lack mitochondria, the cellular structures responsible for converting sugar and oxygen into energy. Instead, their cells are rich in hydrogenosomes, structures that can do a similar job in an oxygen-free environment.

While the researchers do not know how these little creatures evolved to survive in such a harsh environment, they provide a great insight into what the environment under the Earth's ocean used to be like, about 600 million years ago, when the ocean waters did not contain oxygen and, the creatures were much smaller.

The expedition that found these fascinating creatures, is the third one carried out in the last 10 years to look for living organisms in this salty basin, that lays 200km from the Greek Island of Crete.



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  • the girl308Wednesday, June 24, 2015 at 2:24 pm
    thats so cool how the can breath with no OXYGEN!!
    • sydneyblue
      sydneyblueWednesday, June 3, 2015 at 3:04 pm
      I think its amazing how they are able to breath without OXYGEN
      • haniaSunday, April 26, 2015 at 3:15 pm
        i do not like it i will scream if that was in my house
        • chriss3617
          chriss3617Tuesday, April 21, 2015 at 1:21 pm
          They can live without oxygen LIKE A BOSS!!!
          • pupayy
            pupayyMonday, April 20, 2015 at 1:39 pm
            Imagine if humans didn't need oxygen...Sigh Those animals are boss
            • sydneyblue
              sydneyblueWednesday, June 3, 2015 at 3:05 pm
              you got that right
            • meeeMonday, April 20, 2015 at 1:30 pm
              • hi'Monday, April 20, 2015 at 1:27 pm
                this is so cool
                • rock and rollTuesday, March 31, 2015 at 9:03 am
                  I wish it had more info It is so cool
                  • kid600
                    kid600Monday, March 30, 2015 at 3:49 pm
                    IT IS SO COOL!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                    • WesleySunday, March 29, 2015 at 1:58 pm
                      What a great animal.

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