Harvard researchers reveal the earliest known Chelicerata in a new study published in Nature. The 500-million-year-old fossil, named Megachelicerax cousteaui, provides unequivocal evidence of chelicer...

The evolutionary onset of animal biomineralization in the late Ediacaran (ca 555–538 Ma) is marked by the global appearance of enigmatic tubular fossils with unresolved phylogenetic relationships. Amo...