Prehistoric Planet 2, Episode 4: Oceans Recap

The fourth episode of the sensational series “Prehistoric Planet 2” takes us on a deep dive into the prehistoric oceans, revealing an incredible array of marine life that once ruled the seas. The episode focuses on various aquatic creatures, with a particular emphasis on ammonites, mosasaurus, morturneria, phosphorosaurus, and therizinosaurus.

A Journey Back in Time

Our journey begins with a glimpse into the world of ammonites, one of the most recognizable fossils from the prehistoric planet. These fascinating creatures, with their spiral shells, thrived in the world’s oceans for over 300 million years. They evolved into a myriad of shapes and sizes, from tiny species no bigger than a coin to massive ones that could reach up to three feet in diameter.

Ammonites were not just abundant but also diverse, adapting to different marine environments and playing a crucial role in the food chain. Their extinction at the end of the Cretaceous period marked a significant shift in marine ecosystems.

Mosasaurus: The Sea’s Apex Predator

Next, we encounter the formidable mosasaurus. This gigantic marine reptile was the terror of the late Cretaceous seas. With its powerful jaws, equipped with sharp, conical teeth, the mosasaurus was undoubtedly one of the most fearsome predators of the prehistoric planet.

Despite being an aquatic creature, mosasaurs breathed air and likely hunted near the surface, ambushing prey from below with devastating speed and power. Its diet included fish, birds, and even other marine reptiles.

Morturneria: The Mysterious Marine Reptile

The episode then introduces us to the enigmatic morturneria. This marine reptile, known from a single specimen found in Antarctica, has puzzled scientists due to its unusual features. Its teeth suggest that it was a filter feeder, straining small organisms from the water column—a rare adaptation among marine reptiles of its time.

Despite the scarcity of fossil evidence, the existence of morturneria gives us a glimpse into the diverse and complex ecosystems that existed in the prehistoric oceans.

Phosphorosaurus: A Unique Adaptation

Our journey continues with the phosphorosaurus, a type of plesiosaur that lived during the late Cretaceous period. Unlike most other marine reptiles, phosphorosaurus had a long, slender body and a small head, adaptations that allowed it to hunt in the open ocean, far from the coast.

The unique body shape of the phosphorosaurus suggests that it was a fast swimmer, capable of pursuing prey over long distances. Its diet likely consisted of small fish and squid, which were abundant in the open ocean environment where it lived.

Therizinosaurus: The Dinosaur with Giant Claws

Finally, we turn our attention to land and meet the therizinosaurus. Although not a marine creature, this dinosaur is included in the episode because of its strange and fascinating characteristics. Known for its gigantic claws—among the largest of any known animal—therizinosaurus was a sight to behold.

Despite its fearsome appearance, therizinosaurus was likely an herbivore or omnivore. Its long neck and claws were probably used for reaching high vegetation, while its large, barrel-shaped body suggests a diet that required a significant amount of digestion.


The fourth episode of “Prehistoric Planet 2” offers an exciting and educational journey into the prehistoric oceans, introducing viewers to a variety of fascinating creatures. From the spiral-shelled ammonites to the terrifying mosasaurus, the enigmatic morturneria, the uniquely adapted phosphorosaurus, and the giant-clawed therizinosaurus, we gain a deeper understanding of life on the prehistoric planet.

As we continue to explore these ancient ecosystems, we are reminded of the incredible diversity of life that our planet has hosted throughout its history, and the importance of preserving it for future generations.

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