Life at the start of the Ordovician remained confined to the seas with new animals evolving in place of those that didn't survive the Cambrian. Chief among them were the squidlike nautiloids ...

We study trilobites from four periods of the Palaeozoic: the Cambrian, Ordovician, Silurian and Devonian. Our research covers trilobite taxonomy, phylogeny, functional morphology, biogeography, and ...

Learn more about a time period marked by an intense burst of evolution. 3 min read The Cambrian period, part of the Paleozoic era, produced the most intense burst of evolution ever known.

All animal evolution for the last half billion years has come from tinkering with these Cambrian body plans. Then, between about 570 and 530 million years ago, another burst of diversification ...

Inspired by the early life forms of prehistoric worms and other invertebrates that triggered the Great Ordovician ...