Ceratosaurus nasicornis & Stegosaurus armatus

Ceratosaurus nasicornis & Stegosaurus armatus by Josef Moravec. Original oil painting 28" x 22" (71 x 56 cm)

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Ceratosaurus is a medium-sized carnivorous theropod dinosaur that lived during the Late Jurassic period, around 155 to 145 million years ago. Fossils have been primarily discovered in the Morrison Formation of North America (such as Colorado and Utah) as well as Portugal in Europe.

Physical Characteristics
• Name Meaning: "Horned lizard," referencing the prominent bony horn on its snout.
• Size: Measured about 16 to 23 feet (5 to 7 meters) long and weighed roughly 1,000 to 2,000 pounds (0.5 to 1 ton).
• Distinct Features: It featured a tall nasal horn, small bumps over its eyes, short four-fingered front limbs, and a unique row of small bony armor plates (osteoderms) running down its back.
• Teeth: It had unusually long, blade-like teeth designed to inflict deep wounds.

Diet and Habitat
• Diet: A meat-eater that hunted smaller dinosaurs and potentially consumed aquatic prey such as fish, turtles, and crocodiles.


Stegosaurus is a large, plant-eating dinosaur from the Late Jurassic period, easily recognized by the distinctive double row of bony plates on its back and the dangerous spikes on its tail.

Key Facts About Stegosaurus
• Scientific name Stegosaurus (Roof lizard or covered lizard)
• Time Period: They lived approximately 155 to 145 million years ago during the Late Jurassic.
• Size and Weight: They typically grew between 21 and 30 feet long (6.5 to 9 meters) and weighed around 2 to 7 tons. Speed: 9.5 - 11 mph.
• Location: Fossils have primarily been discovered in the western United States and Portugal.
• Diet: As a dedicated herbivore, it grazed on low-growing ferns, cycads, and mosses.
• The Plates and Spikes: The iconic back plates likely helped regulate body temperature or served as visual displays. The spiked tail (known as a thagomizer) was a powerful defense weapon against predators.

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