China's 520-million-year-old fossils finally solve one of evolution's biggest mysteries

For decades, one puzzle stood out among the many mysteries of early animal evolution: the missing origin story of bryozoans. These tiny, filter-feeding colonial animals live in almost every ocean today, forming lace-like mats on rocks and shells, yet fossils of their ancestors were nowhere to be found during the Cambrian explosion, the burst of evolutionary activity around 530 million years ago that gave rise to nearly every other major animal group alive today.

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