Growing up trilobite

(American Museum of Natural History) If you've ever held a trilobite fossil, seen one in a classroom, or walked by one in a store, chances are it was Elrathia kingii, one of the most common and well-recognized trilobites. New work describes the development and growth rate of Elrathia kingii--only the second such dataset to be compiled for a trilobite--allowing for the first comparison among trilobite species.