Abstract
A scorpion fossil (Protoischnurus axelrodorum) from the Lower Cretaceous Crato Formation (Aptian, northeastern Brazil) is analyzed with computed microtomography. Its taphonomy and morphology is described and illustrated, a revised diagnosis of the genus is presented, and the phylogenetic relationships of this taxon are discussed. Protoischnurus belongs in the Scorpionoidea and is probably an early member of the Iurida crown group, possibly representing a stem hormurid.
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