Spinosaurinae is a sub-family of specialized theropod dinosaurs. Members of this family were large, bipedal predators with elongated, crocodile-like skulls, sporting conical teeth with no or only very tiny serrations. The front dentary teeth fanned out, giving the animal a characteristic look. The name of this family alludes to the typically conspicuous sail-like structure protruding from the back of species in the type genus, Spinosaurus. Image:Tyrannoskull.jpg This theropod-related article is a stub. You can help Fossil Wiki by [ expanding it].