At least 57 species of ammonites, which were widespread and belonged to six superfamilies, were extant during the last 500,000 years of the Cretaceous, indicating that ammonites remained highly diverse until the very end of their existence.

Discover the fascinating world of ammonites—prehistoric cephalopods with iconic spiral shells. Learn their biology, evolution, and fossil significance.

Discover the fascinating world of ammonites — extinct marine cephalopods. Learn about their evolution, shell structure, fossilization, and role as key index fossils in geology.

Ammonites were shelled cephalopods that died out about 66 million years ago. Discover when they lived, why they went extinct, why they're important to science, and much more.

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A variety of ammonite forms, from Ernst Haeckel 's 1904 Kunstformen der Natur. This list of ammonites is a comprehensive listing of genera that are included in the subclass † Ammonoidea, excluding purely vernacular terms.

Explore ammonite fossils that date back hundreds of millions of years. These authentic prehistoric cephalopods capture the spiral geometry of ancient ocean life.

Learn to identify and collect genuine ammonite fossils from Lyme Regis, Morocco and beyond.

Scientists have identified more than 10,000 ammonite species, such as Arnioceras semocostatum pictured here, and use their shells to date other fossils.

Their shells are preserved as fossils. But before science had an answer, ammonite fossils were mysterious objects that gave rise to rich and fascinating folklore all over the world.