Kinda glad I can’t see these things with my naked eye.
Gak. Imagine the adventurers running into a head lice their size at the bottom of a dungeon. They discover the pole the monster was clinging to is attached the head of something freakin’ huge, slumbering with just its the top of its head and hair sticking up in the bottom level. Like the last scene from the movie Cabin in the Woods. Do not wake up the monster the huge head lice is infesting.
Horrifying creatures, indeed! Any dungeoncrawling or Cthulhu-themed game would benefit from them.