Aeogocrioceras sp were an interesting species of ammonite which exhibited uncoiled shells to various extents, they belong to the ancyloceratina suborder, with this particular group with uncoiled shells known as heteromorph ammonites and could be further identified by their cytocone shell, meaning the shell did not touch at any of its surfaces, instead being open. They began to appear in the fossil record during the Jurassic period 199 million years ago, but became quite abundant during the Cretaceous period up until their extinction during the K–Pg extinction event 65 million years ago. It is understood from an evolutionary perspective that the shell shape likely would not have helped the animal to be a particularly good swimmer and it is assumed that they awkwardly swam their way around with not too much control. These particular ammonites are known as aeogocrioceras, though we have been unable to determine the exact species, they are dated to the Lower Cretaceous, Hauterivian Stage, around 135 million years ago and come from Resse Pit, Hannover, Germany. This particular specimen measures 110 mm at it’s widest point (110 mm wide on matrix) and comes supplies with a stand and information label. An excellent items for serious collectors, especially those concentrating on various ammonite species, the specimen in the image will be the item you receive.