Confirmation that bryozoan animals were present during the Cambrian explosion

Bryozoan animals were present during the Cambrian explosion, a period of rapid evolutionary diversification that began approximately 538 million years ago. Newly discovered fossils from the Cambrian period, published in Nature on June 10, 2026, provide evidence that the bryozoan phylum had already diversified by this ancient time. Bryozoans are marine invertebrates characterized by their colonial lifestyle. Previously, these animals were widely believed to be absent from the fossil record of the Cambrian explosion, a significant gap in understanding early animal evolution. The identification of these fossils challenges existing timelines and theories regarding the emergence and diversification of complex animal life during this critical geological era. This finding necessitates a re-evaluation of the evolutionary history of marine invertebrates and the ecological dynamics of the Cambrian seas. The research team's analysis of the fossil morphology and geological context supports the conclusion that these early bryozoans were established members of Cambrian ecosystems, contributing to the complex biodiversity that defined the period.