Fossil horseshoe crabs are rare, and new discoveries have the potential for providing important taxonomic and biostratigraphic information. The superfamily Limulacea Zittel, 1885, embraces the lineal ancestors of the modern genera, including LimulusMüller, 1785, within the Limulidae Zittel, 1885. The geologically oldest of the limulaceans are arrayed within the late Paleozoic Paleolimulidae Raymond, 1944. The first discovery, as well as all authentic specimens, of fossil paleolimulids have been from the Late Paleozoic rocks of Kansas and Illinois. This paper not only describes a new genus and species of horseshoe crab but also records the...

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