3 min read The Cambrian period, part of the Paleozoic era ... including many major animal groups alive today. Among them were the chordates, to which vertebrates (animals with backbones) such ...

Animals living about 500 million years ago spent time on mudflats that were periodically exposed to the air. The finding suggests that some of the earliest animals were able to survive outside of ...

All animal evolution for the last half billion ... Recent research suggests that the period prior to the Cambrian explosion saw the gradual evolution of a "genetic tool kit" of genes that govern ...

For over a century, scientists have been puzzled by a mysterious fossil called Helmetia expansa, an ancient arthropod from ...

Researchers formally describe Helmetia expansa, offering new insights into its anatomy, behavior and evolutionary relationships.

Arthropods were the most diverse animal group in the Cambrian period and the Ordovician period that followed. The 452-million-year-old limestone slab shown here captures an Ordovician menagerie ...

Environmental stress in evolution can be reframed as a powerful engine of innovation, not simply a barrier to survival.

Some animals could likely tell the difference between light and dark, but they never knew whether that looming shadow was a friend or foe. Then, at the beginning of the Cambrian Period, life opened ...

The new study found the characteristics in Helmetia expansa differed from previous studies. It is said that these species had ...

All animal evolution for the last half billion ... Recent research suggests that the period prior to the Cambrian explosion saw the gradual evolution of a "genetic tool kit" of genes that govern ...