Photograph of the Tacuarí trace fossils, illustrating typical bilobate and sinuous trails. (Ernesto Pecoits and Natalie Aubet) A teensy sluglike animal that wriggled around the sediment in search of ...

The evolution of worms, insects, vertebrates and other "bilateral" animals—those with distinct left and right sides—from less complex creatures like jellyfish and sea anemones with "radial" symmetry ...

A research team led by a Brown University professor has shed new light on the evolutionary history of bilateral organisms. In a study published last week, the team, led by Assistant Professor of ...

In the most computationally intensive phylogenetic analysis to date, an international research team has found the first evolutionary branching for bilateral animals. The researchers determined that ...

The oldest fossil, 550 million years old, has been discovered in the interior of South Australia. Fossils are crowded with small creatures like rice grains of 2 mm to 7 mm, and a research team who ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. The heads of most ...

Tiny fossils less than a fifth of a millimetre across may reveal a critical step in the early evolution of animals. They show that internal complexity came before large size, suggesting ...

A teensy sluglike animal that wriggled around the sediment in search of food at least 585 million years ago didn't die in vain. The tiny mover left behind tracks that researchers now say represent ...