I flipped out when I first saw this guy! SO cool, SO different, SO unique. The coloration pattern reminds me of Tiger's Eye and I've never seen a chamber half open/half closed like these are. The pictures don't do it justice... it's a BEAUTY! Ammonites were predators that resembled a squid with a shell. These cephalopods had eyes, tentacles, and spiral shells. They are more closely related to a living octopus, though the shells resemble that of a nautilus.