Ammonites were predatory mollusks that resembled squid. 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. Ammonites first appearing in the fossil record 240 million years ago, descending from straight shelled cephalopods. The last lineages disappeared 65 million years ago at the end of the Cretaceous. They are commonly found as fossils, formed when the remains or traces of the animal became buried in sediment which later solidified into rock. Explore Art By God’s collection of Ammonite at affordable prices in different sizes from all over the world.