Unlike many horseshoe crab fossils discovered in the past, Vaderlimulus dates to the Triassic Period. It’s the first such crab fossil found from that period, with the vast majority dating to an ...

An international team of scientists has uncovered a fascinating piece of the evolutionary puzzle: how the ventral nerve cord, ...

This worm fossil — from one of the first lineages of arthropods — is an important piece of the evolutionary puzzle that led to insects, spiders, and crabs. The specimen details how simple worm ...

crab- or spider-like legs and a long, stout tail. It is a “living fossil” whose appearance has remained unchanged for about 200 million years. Females are about 60 centimeters long and weigh ...