Product #: 141041
Regular price $29.99 Save $-29.99Ammonoids are a major group of extinct shelled cephalopods (the group containing octopuses and squid) that lived from the Devonian (~380 million years ago) to the end of the Cretaceous (~65 million years ago). While most modern cephalopods have an internal shell or no shell at all, ammonoids had chambered shells subdivided by complex folded walls, or septa.