I was in Elephant's Den Cave, MA for the NRO last Saturday, and found something living in a puddle. There was some plant debris which had sprouted roots and some dead bugs in there, and at first I thought a root was swaying in the current. But this was a puddle; there was no current.
It was a very thin worm, brown, not segmented, a foot long and about as thick as a human hair. I had never seen anything like it. Anyone know if this is an established cave organism? Or maybe a surface organism that got stuck in the puddle and had enough food to get by?