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Computed microtomography (XR-μCT) was used to study the three-dimensional morphology of Palaeoscolex cf. tenensis, a palaeoscolecid worm from the Lower Ordovician Fezouata Lagerstätte (Central Anti-Atlas, Morocco). This method revealed important aspects of its internal anatomy such as a pharynx bearing longitudinal rows of tiny teeth. Tubular structures are interpreted as the fragments of a cylindrical...