Circulimulus discobulus: Bridging 80 Million Years in Horseshoe Crab Evolution

We explore Circulimulus discobulus, a small Silurian horseshoe crab whose 2025 description fills an 80‑million‑year gap in chelicerate history. Its multi‑segmented post‑abdomen and two‑pronged telson reveal an ancestral body plan that links Ordovician forms to later Zephosyrida, reshaping where and when modern horseshoe crabs diversified. Laser‑stimulated fluorescence and other imaging show how a tiny fossil can rewrite big chapters in life’s history.

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