Ancient seabed checkerboard: How setae shaped spatial distributions of Silurian brachiopods

Proceedings of the National Academy of Sciences, Volume 122, Issue 30, July 2025. <br/>SignificanceSmall anatomical details can significantly influence how marine animals organize themselves, yet such interactions are rarely visible in fossils. We report exceptionally preserved soft, bristle-like structures ("setae") on 436-My-old …