Complex Colonial Life Was Already Thriving during Cambrian Explosion Sci.News 500-million-year-old fossil helps fill a strange gap in our record of life on Earth The Conversation Extraordinary fossils solve a 500-million-year mystery: Bryozoans were there at the dawn of animal life Phys.org High-fidelity modular skeletons authenticate a Cambrian origin for Bryozoa Nature Forgotten Fossil Helps Rewrite Part Of Animal Evolution astrobiology.com