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.

May 21, 2024 · Ammonites were cephalopods, most closely related to living octopus, squid, and cuttlefish, though all their closest relatives are extinct. They lived in a distinctive spiral shell, which …

With squidlike tentacles extending from their distinctive multichambered shells, the extinct marine predators known as ammonites were once among the most successful and diverse animals on Earth.

Jul 22, 2025 · Ammonites were marine mollusks that lived millions of years ago. Their spiral shells are often found as fossils. Let's dive into some fascinating facts about these ancient creatures. …

Jul 6, 2023 · Ammonites are extinct marine mollusks that lived from the Devonian to the end of the Cretaceous Period, roughly 400 to 66 million years ago. They are among the most important index …

Feb 21, 2025 · Despite their reptile-like appearance, ammonites were actually cephalopods that lived in the ocean. The closest living relatives to ammonites are coleoids, including squids, octopuses and …

Ammonites were predatory, squidlike creatures that lived inside coil-shaped shells. Like other cephalopods, ammonites had sharp, beaklike jaws inside a ring of tentacles that extended from their …

Ammonites first appeared in the early Devonian period. They evolved from a small, straight shelled Bactridian, which was an early Nautiloid. They quickly evolved into a variety of shapes and sizes, …

Ammonites hold significant cultural and scientific importance as fossils and symbols of Earth’s ancient history. Throughout human history, these spiral-shaped shells have fascinated people across …

Ammonites are a distinctive class of extinct invertebrates within the Phylum Mollusca. These spectacular looking marine animals thrived in the Paleozoic and Mesozoic Eras, which equates to approximately …