A recent study shows that marine oxygen levels were crucial to the evolution of early Paleozoic trilobite body size, ...

But Mosura was different. Instead of the familiar streamlined body with flaps and claws, this little predator had something ...

Photograph by James L. Amos The iconic arthropods of the Cambrian were the trilobites, which left a huge number of fossils. Trilobites had flattened, segmented, plated bodies that helped to ...

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 ...

Helmetia expansa was found to have walking legs and molting behavior, changing assumptions about its mobility and growth. For ...

And yet they share a common Cambrian chordate ancestor ... including various echinoderms and trilobites, such as Ceraurus, the turtle-like form on the left edge. Equally enigmatic is their ...

Trilobite compound eyes are the earliest well-preserved visual ... predicts that a shared set of genes used to build eyes originated before the start of the Cambrian. We can’t pinpoint precisely when ...

This is an illustration of marine fossils that have existed since the Cambrian. Represented taxa include brachiopods, trilobites, ammonites, bivalves, and decapods. Disclaimer: AAAS and EurekAlert!

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 ...

Fig.1: Tempo and mode in the body size evolution of Cambrian-Ordovician trilobites. Changes in maximum size (red) and mean size (blue) for each time slice, with lines and shading representing the ...