Guess This Animal

Okay so here is a little challenge for folks:  What kind of animal is this?

 My group saw many of these during some fieldwork last week.  We were in the Taylor Valley in the Dry Valleys region of Antarctica.  These critters are 5,000 to 9,000 years old and some were found on the valley floor and others were found more than 1,000 feet up the sides of the valley.

Spinal Cord

Leave your guess in the comments section and I’ll post photos of the full creature in a few days.