Kristensen discovered Limnognathia maerski in a radioactive spring on Disko Island in 2000 .
Limnognathia maerski is the first ( and so far only ) known species in the group .
Kristensen discovered Limnognathia maerski , the first ( and so far only ) known species in the group , in a radioactive spring on Disko Island in 2000 .