Spinosaurus mirabilis is a recently described species of spinosaurid theropod from mid-Cretaceous deposits of the Sahara in Niger, expanding the diversity known within the genus Spinosaurus. The species is distinguished by an exceptionally tall, scimitar-shaped cranial crest, likely sheathed in keratin in life, interpreted as a display structure used for visual signaling rather than feeding. The skull retains the elongate, narrow rostrum and conical, interlocking dentition characteristic of spinosaurids, indicating specialization for capturing fish and other aquatic prey.