Early arthropod specimens don’t have claws like these. Instead, Cambrian arthropods usually have an antenna in that position.

Rudy Lerosey-Aubril A tiny claw in a 500-million-year-old fossil just rewrote the origin story of spiders. After a full da ...

A Utah fossil shows early relatives of spiders and scorpions already had distinctive front claws 500 million years ago.

Aubril. As a reward, he returned to cleaning an intriguing Cambrian arthropod fossil he had recently received for review. At ...

An incredible fossil has become the oldest known chelicerate – the group of animals that includes spiders and scorpions.