Loving the presentation of these FIVE pearly iridescent ammonites! Makes such a nice display piece and the flashes of color hit and sparkle as the light reflects at different angles. Eye catcher and light catcher! Ammonites were predatory mollusks 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.