'Dun'-like sandworm existed thousands and thousands of years sooner than thought
[ With a head lined in rows of curved spines, the traditional Selkirkia worms might simply be confused with the razor-toothed sand worms that inhabit the desert of Arrakis in “Dune: Half Two”. Throughout the Cambrian explosion greater than 500 million years in the past, these unusual worms—which lived inside lengthy, cone-shaped tubes—have been a … Read more