Ammonites were devastated by the end-Triassic extinction, with only a handful of genera belonging to the family Psiloceratidae of the suborder Phylloceratina surviving and becoming …

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.

Ammonites were preyed upon by numerous marine animals such as Plesiosaurs, Mosasaurs, and Ichthyosaurs. Similar to contemporary cephalopods, they might have evaded predators by …

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 …

Aug 15, 2025 · What Were Ammonites? Ammonites were shelled marine mollusks in the class Cephalopoda, related to modern octopuses, squids, and nautiluses. They possessed an …

Mar 17, 2021 · Ammonites are prehistoric marine mollusks with distinctive curled shells. Once abundant in Earth’s oceans, ammonites – along with the dinosaurs and many other species – …

Ammonites were marine animals belonging to the phylum Mollusca and the class Cephalopoda. They had a coiled external shell similar to that of the modern nautilus. In other living …

Related to the living chambered Nautilus, ammonites are extinct members of the group of marine animals called cephalopods, which include such other living species as squid, cuttlefish, and …

Ammonites possessed distinctive coiled shells that resemble tightly wound spirals. These shells were composed primarily of aragonite, a form of calcium carbonate, which allowed them to …

Nov 11, 2025 · There is evidence that these animals consumed zooplankton, crustaceans, and other ammonoids. The shells, which are either straight or coiled, served as protective and …