First ever animal that can survive without oxygen

[Catherine]

I noticed the headline in my news alert, but I hadn't read it yet. I am interested to read about it and find out that the creature is related to the jellyfish. We always think we know and understand most forms of life and then we find something completely different.
The question now is whether there are other creatures like it. How many life forms have evolved to survive "abnormal" conditions.
We still have so much to learn about our Planet.