During the final days of the Cretaceous, a 7.5 mi (12.07 km) wide asteroid slammed into Earth and killed around half of the species. When did the Ammonite become extinct?Īmmonites became extinct 66 million years ago, most of them died out at the same time as non-avian dinosaurs. Ammonites free-floated in the water, with their tentacles protruding from their shells. Ammonites became abundant in the Mesozoic period. In which geological period did the Ammonite live?Īmmonites lived on Earth during the Jurassic period or the Cretaceous period that represented a time interval of about 140 million years. They became extinct 66 million years ago according to research done on on an Ammonite fossil. These species of Ammonite fossils ruled the planet for more than 300 million years ago and lived for longer than most dinosaurs. What type of prehistoric animal was an Ammonite?Īmmonites also called Ammonoids came into existence during the Devonian period, which began about 416 million years ago. It means a marine animal of subclass (Ammonoidea) of extinct cephalopods that became abundant in the Mesozoic period which are classified based on flat spiral shells with septa dividing the interior into chambers. How do you pronounce 'Ammonite'?Īmmonite is pronounced as 'a -muh- nite', and there are many ways it can be pronounced. Their shell looks similar to the modern nautilus whereas if compared to other marine animals like octopus, squid, and cuttlefish, their shells are small or sometimes absent. They belong to the phylum Mollusca and the class Cephalopoda of the subclass Ammonoidea and they were creatures that were first seen 450 million years ago in the Cretaceous period. They can be called marine animals that used to live million years ago and died 66 million years ago. To know more interesting facts about other pre-historic animals, you can also check out these Rahonavis and Brachauchenius.Īmmonite Interesting Facts Was the Ammonite a dinosaur?Īmmonites are animals found in the water. When they coiled, it served as a protective structure enabling the animal to compensate for living at varying water depths. There is a species called Nipponites mirabilis found in Japan which looks like a knot. The Ammonite shell shape was a loose spiral and tightly curled, with whorls touching and are flat or helical.

They shifted their whole body into the new chamber and sealed off their old and now too-small living quarters with walls known as septa. The species of Ammonites were born with shells around them and as they started to grow, they built a new chamber onto it. They had a large population in the Triassic period and some specimens that survived in that period can be seen in the Natural History Museum. This group of cephalopods was divided into three groups known as squids, octopuses, and cuttlefishes which also included nautiloids (the nautiluses) and Ammonites. Zoo Hughes, who was the Curator of Fossil Invertebrates, discovered that these Ammonites have a chambered shell that they used for buoyancy. Earlier, their species were understood to be snakes and were named snakestone but it was later realized that these species were not reptiles and were actually ocean-dwelling mollusks, specifically cephalopods.

Their fossils are still found in the world even in this time period and in large concentrations. Ammonites were animals who were shelled cephalopods that lived million years ago and died about 66 million years ago.

Ammonite sea creature