image: This shows Kenneth De Baets with a fully grown manticoceras (Late Devonian Period, Morocco): One of the largest ammonites of the Devonian Period. view more . Credit: Picture: Christian Klug ...

Ammonites first evolved some 409 million years ago in the Devonian period, finally going extinct some 65 million years ago alongside the more famous dinosaurs. Scroll down for video ...

Ammonites appeared about 400 million years ago (the Early Devonian) and experienced an explosive radiation in the early Jurassic. In fact, ...

From their first appearance in the Early Devonian Period (about 400 million years ago), ammonites underwent an explosive diversification. Today, many thousands of species are known from the fossil ...

This ammonite dates to the Devonian period approximately 395 million years ago, and was found in modern-day Morocco. This cross-section was polished to show the minerals deposited in the inner ...

Ammonites – the ancient relatives of squid and octopuses ... Devonian pearls and ammonoid-endoparasite co-evolution Acta Palaeontologica Polonica DOI: 10.4202/app.2010.0044. More on parasites: ...

Some Devonian trees are known to have grown 100 feet (30 meters) tall. By the end of the period the first ferns, horsetails, and seed plants had also appeared.