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 mean ...

This column is part of a series where Verge staffers post highly subjective reviews of animals. Up until now, we’ve written about animals without telling you whether they suck or rule. We are now ...

Fig. 4: Cambrian and Ordovician trilobite body size (A) and their correlation to the inferred oxygen levels (B) and temperature (C). (B) Ocean redox conditions and widespread anoxic intervals, showing ...

New collections rich in agnostoid trilobites were recovered from Lower Ordovician strata of the southern Montagne Noire, France. The faunas occur in the La Gardie/Val d'Homs, Saint-Chinian, La ...

Trilobites may have grown in a similar fashion and reached ages that match those of extant crustaceans, a new study has found. Trilobites -- extinct marine arthropods that roamed the world's oceans ...

Some 465 million years since this marine scavenger was caught unawares by an approaching deadly mud current that would bury it alive, it had spent its last hours enjoying a large, varied seafood menu ...

A recent study shows that marine oxygen levels were crucial to the evolution of early Paleozoic trilobite body size, suggesting that oxygen may have influenced the evolution of other animals' body ...