Allosaurus was quite a vicious animal. So if they were to brawl, I honestly think Spinosaurus is the best winner. [42], Spinosaurus gives its name to the dinosaur family Spinosauridae, which includes two subfamilies: Baryonychinae and Spinosaurinae. [6][20][40], Very tall neural spines growing on the back vertebrae of Spinosaurus formed the basis of what is usually called the animal's "sail". in assessing spinosaurine specimens from the Kem Kem Group suggested the Brazilian spinosaurine Oxalaia to be a potential junior synonym of Spinosaurus aegyptiacus. [53] Theropods, including spinosaurids, could not pronate their hands (rotate the forearm so the palm faced the ground),[54] but a resting position on the side of the hand was possible, as shown by fossil prints from an Early Jurassic theropod. In 1915, German paleontologist Ernst Stromer published an article assigning the specimen to a new genus and species, Spinosaurus aegyptiacus. The sail could have possibly reduced yaw rotation by counteracting the lateral force in the direction opposite to the slash as suggested by Gimsa and colleagues (2015). Browse more videos. [52] Starting in the mid-1970s, it was hypothesised Spinosaurus was at least an occasional quadruped,[35][44] bolstered by the discovery of Baryonyx, a relative with robust arms. I think Allosaurus would mow down the Spinosaurus, using its razor sharp teeth to make the Spinosaurus fall over and then the Allosaurus would finish Spiny. Forming a hydrodynamic fulcrum and hydrodynamically stabilizing the trunk along the dorsoventral axis, Spinosaurus’ sail would also have compensated for the inertia of the lateral neck by tail movements and vice versa not only for predation but also for accelerated swimming. The environment inhabited by Spinosaurus is only partially understood, and covers a great deal of what is now northern Africa. [36], In 2009, Dal Sasso and colleagues. [46] Large fish are known from the faunas containing other spinosaurids, including the Mawsonia, in the mid-Cretaceous of northern Africa and Brazil. [41] In support of his "buffalo-back" hypothesis, Bailey argued that in Spinosaurus, Ouranosaurus, and other dinosaurs with long neural spines, the spines were relatively shorter and thicker than the spines of pelycosaurs (which were known to have sails); instead, the dinosaurs' neural spines were similar to the neural spines of extinct hump-backed mammals such as Megacerops and Bison latifrons. Unlike in other theropods, the hallux (or fourth toe) of Spinosaurus touched the ground, and the phalanges of the toe bones were unusually long and well-built. Through experimentation by Lauder and Pierce, the tail of Spinosaurus was found to have eight times as much forward thrust as the tails of terrestrial theropods like Coelophysis and Allosaurus, as well as being twice as efficient at achieving forward thrust. Lapparent, A.F. When herding a shoal of fish or squid, sailfish also raise their sails to make themselves appear larger. [20], The subfamily Spinosaurinae was named by Sereno in 1998, and defined by Holtz and colleagues (2004) as all taxa closer to Spinosaurus aegyptiacus than to Baryonyx walkeri.