Other bones found nearby ( Stromer, 1934) contributed to his initial reconstruction of S. In 1915, Ernst von Stromer announced the discovery in Egypt’s Western Desert of the elongate jaws and partial skeleton of a large sail-backed predator Spinosaurus aegyptiacus ( Stromer, 1915). Two stages are clarified in the evolution of Spinosaurus, which is best understood as a semiaquatic bipedal ambush piscivore that frequented the margins of coastal and inland waterways. New fossils also show that Spinosaurus ranged far inland. Living reptiles with similar spine-supported sails over trunk and tail are used for display rather than aquatic propulsion, and nearly all extant secondary swimmers have reduced limbs and fleshy tail flukes. aegyptiacus was bipedal and in deep water was an unstable, slow-surface swimmer (<1 m/s) too buoyant to dive. We assembled a CT-based skeletal reconstruction based on the fossils, to which we added internal air and muscle to create a posable flesh model. We test these functional claims with skeletal and flesh models of S. aegyptiacus was a slow quadruped on land but a capable pursuit predator in coastal waters, powered by an expanded tail. aegyptiacus was the first fully aquatic dinosaur. Recent discovery of the high-spined tail of that skeleton, however, led to a bolder conjecture that S. A predominantly fish-eating diet was envisioned for the sail-backed theropod dinosaur Spinosaurus aegyptiacus when its elongate jaws with subconical teeth were unearthed a century ago in Egypt.
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