Tachypleus decheni is an extinct species of horseshoe crab in the genus Tachypleus that lived in the Borna Formation of Germany, during the Upper Eocene. It is one of two fossil species within the genus Tachypleus.C. Zinken. 1862. Limulus decheni aus dem Braunkohlensandstein bei Teuchern. Zeitschrift für die Gesammten Naturwissenschaften 19:329-331
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