Based on the fossil record, ammonites came in a wide range of sizes and shapes, from smaller than an inch to as large as nine feet wide. Some ammonites had long, straight shells, while others had ...

Ammonites are extinct marine mollusks that thrived in Earth’s oceans for over 300 million years before their extinction around 66 million years ago. They were spiral-shelled creatures ...

Ammonites, a group of extinct marine mollusks, are known for their distinctive coiled shells and played a significant role in the marine ecosystems of the Mesozoic era. Their evolution and ...

But ammonites weren't reptiles: they were ocean-dwelling molluscs, specifically cephalopods. Zoë Hughes, Curator of Fossil Invertebrates at the Museum, explains, 'Ammonites are extinct shelled ...

Ammonites are a group of extinct shelled cephalopods related to today's squids and octopuses. Most ammonites died out 66 million years ago, at the same time as dinosaurs. Fossilised ammonite shells ...

Much of this rich life—including all dinosaurs, pterosaurs, pliosaurs, and ammonites—perished in the extinction event at the end of the period 65 million years ago. In fact, the land ...

Ammonite fossils, an example is shown here, are sea creatures that became extinct about 65 million years ago. Fossil remains have been found in rocks of all ages. Fossils of the simplest organisms ...