Chaetae are stiff bristles made of chitin that characterize many species of annelid worms. Reconstruction of Shaihuludia shurikeni from the Spence Shale of Utah. Image credit: Rhiannon LaVine. Shaihuludia shurikeni inhabited the Cambrian seas approximately 507 million years ago. The ancient creature was a type of annelid, a diverse group of segmented worms found in terrestrial, freshwater and marine environments all over the world. Shaihuludia shurikeni...
