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| Scientific name | Liopleurodon pachydeirus |
| Home time period | Middle Jurassic |
| Creature type | Pliosaur |
| Deaths caused | One Leedsichthys Two Ophthalmosaurus |
| Appearances | Episode 8.5 |
Liopleurodon is a genus of short-necked, pliosaur-type plesiosaur from the Middle Jurassic Period. There are two species of Liopleurodon, both of which lived at the same time; L. ferox and the smaller L. pachydeirus.
In Primeval[]
Episode 8.5[]
A trio of Liopleurodon attacked a school of Leedsichthys and a pod of Ophthalmosaurus before killing one of the Leedsichthys. As two of the Liopleurodon fight over the Leedsichthys carcass, the third Liopleurodon notices the anomaly and goes through it.
A Liopleurodon feasting on the Leedsichthys carcass.
Later, Matt and Kieran observe the Liopleurodon killing an Ophthalmosaurus while investigating what the unidentified objects the HMS Gartside's sonar had detected were.
Later, the Liopleurodon investigated the HMS Gartside, bumping into it and causing it to shake. On its second pass-by, it damaged the HMS Gartside's power supply, causing it to lose power.
Later, the Liopleurodon attacked Kieran and Jack as they piloted the bathyscaphe, but it quickly lost interest after Kieran turned off the power. It then disappeared into the depths of the English Channel before reappearing and attacking the Leedsichthys and Ophthalmosaurus, herding all but a young Ophthalmosaurus through the anomaly before it closed. It then chased the young Ophthalmosaurus around and killed it before swimming away with its kill.
After devouring the Ophthalmosaurus, the Liopleurodon set its sights on the bathyscaphe and attacked it. However, it was lured back through the now reopened anomaly by Kieran and Jack, where it quickly lost them.
Trivia[]
- Despite having appeared in Episode 5.2, the Liopleurodon seen in Episode 8.5 is much smaller and greatly resembles the Liopleurodon from Walking With Dinosaurs. Therefore, it can be assumed that the Liopleurodon seen in Episode 8.5 is L. pachydeirus, the smaller of the two Liopleurodon species.