Strange Creature found in Russia

What could this mysterious Creature found in Russia be?

I first found out about the images here, great forum, my first impressions also were of a Horseshoe Crab, though it looks like they've found out what it is, a Triop.

If you check out the first link it is said the creature in these photos measured around 5 feet in length and a lot of the other places I have seen the images claim similar large sizes and varying stories as to its origin. If you really look at the pictures though you can see that it is tiny.

Anyway bought back fears of face huggers for me.