Spinosaurus mirabilis

Species: Spinosaurus mirabilis

Classification: Reptile, dinosaur, saurischian, theropod

Diet: Piscivore; eats fish.

Age: 95 million years (Mesozoic era, Cretaceous period, Late Cretaceous epoch, Cenomanian stage)

Length: 8 m (26 ft)

Habitat: Inland freshwater river

Appearance:

• Long, narrow snout with straight conical teeth without serrations.
• A gap between the teeth is present in the upper jaw to accommodate three of the large lower jaw teeth.
• An arched premaxilla that rises above the rest of the snout.
• A scimitar-shaped crest formed by the nasal and prefrontal bones. It curves upward and toward the rear. The bone is encased in a keratinous sheath that significantly expands its size.
• Long, muscular, S-shaped neck.
• Laterally spreading and rotating lower jaw rami during jaw opening, supporting a throat sac.
• Prominent shoulders.
• Large, robust forelimbs bearing three-fingered hands, with an enlarged claw on the first digit.
• Long fingers and recurved claws.
• Palms facing inwards.
• Tall neural spines on the back vertebrae with skin connecting them, forming a sail-like structure.
• Long and narrow tail deepened by tall, thin neural spines and elongated chevrons, forming a paddle-like structure.
• The fourth toe touched the ground and the toe bones were long. At their ends were shallow claws that had flat bottoms, may have been webbed.

Notable Info:

• Lives a semi-aquatic lifestyle on land and in water.
• Has salt glands above the eyes to excrete excess salts and maintain salt balance by "crying" salty tears.

[Non-avian dinosaurs wouldn't roar; they'd grunt, hiss, bellow, and honk. Infrasound (sound below human audibility (20 Hertz)) would also be used. With infrasonic pressure being high, the vibrations can be felt across the body.]