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Liopleurodon is a genus of large, carnivorous marine reptile belonging to the Pliosauroidea, a clade of short-necked plesiosaurs. The two species of.
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Liopleurodon by Ian Woodhead

Due to the impressive finds made by her and others, creatures like ichthyosaurs, plesiosaurs, and mosasaurs made their entrance into our collective knowledge of life. During the middle s, some isolated teeth were discovered in northern France.

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It was evident that the teeth belonged to a large prehistoric marine reptile, and it was established that this creature belonged to a group known as the pliosaurs, which had been named by Sir Richard Owen in the s. The pliosaurs had the same general body plan as their plesiosaur relatives — a rounded stocky body with four large flippers and a short tail — but they had short muscular necks and long crocodile-like heads which were very large in proportion with their bodies.

The pliosaurs seem to have emerged during the early Jurassic Period, and quickly rose to be apex predators of their environment. Phylogenic analysis suggests that it was an advanced member of the pliosaur family. However, it was only half the size of its gargantuan relatives.


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Only partial remains of this animal have been discovered so far, so it is difficult to gauge an accurate size. However, the most common size estimates for Liopleurodon are between 20 to 25 feet in length.

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Liopleurodon first came to my attention in when it was featured in issue 85 of Dinosaurs! In the article, it was mistakenly stated that it grew to be 39 feet 12 meters long, a much larger size than the one it was likely in life. It was also portrayed, remarkably, as being mostly toothless except for a crescent of curved fangs extending from the front of both jaws. Liopleurodon afterwards came to mass public attention when it was featured in episode 3 of the BBC series Walking With Dinosaurs.

Pliosaur and Liopleurodon

In this TV show, the creature bears only a general resemblance to the real animal. Firstly, there was a drastic difference in size. As said earlier, many paleontologists think that Liopleurodon had a maximum size of 25 feet, but within the television series, Liopleurodon was portrayed as being three times larger, measuring 80 feet long, a truly gargantuan size indeed!

This inflated size estimate was based upon a single fragmentary specimen uncovered in Mexico which was attributed to Liopleurodon and was believed to represent a gigantic individual.


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    7. Secondly, the head was the wrong shape, with it being given a much more curvaceous high-arched skull. In reality, the skull was much lower and flatter. Thirdly, the body proportions were incorrect. However, an article from stated that it was likely that the head measured one-fifth the total length of its body. This would have made its head seem somewhat smaller in relation to its body. Granted, much of the skeleton is fictitious, since only partial remains of Liopleurodon have been found in Europe, so the blank spaces were filled in with reconstructions based upon what we know about pliosaur anatomy.

    Liopleurodon Sauvage, 1873

    The first thing that one is struck by is that it is obviously much, much smaller than the size given in Walking With Dinosaurs. The skull is also much flatter than you would expect. This might be due to compression caused by the fossilization process rather than being an accurate portrayal of its natural appearance. The front teeth in both jaws are enormous, while the majority of teeth that line its mouth were only one-half or one-third the size of the front teeth, and most of them are missing.

    This is probably the reason why Liopleurodon was portrayed as having only front teeth in a largely toothless mouth in the Dinosaurs! The front end of the lower jaw is noticeably spoon or scoop-shaped — it is pronounced in relation to the rest of the dentary bone, and it has an obvious upward swoop. The neck is longer, and it has a much more pot-bellied barrel chest.

    All in all, this looks very little like its representation in Walking With Dinosaurs. As one senior BBC executive said: "When you have a series as effective, popular and high quality as Walking with Dinosaurs, it just transforms the schedules and shows what can still be done by the BBC.

    LIOPLEURODON

    Topics Media. BBC comment. Reuse this content. Appearance: Liopleurodon is an immense short-necked plesiosaur. Fully grown it measures close to 80 feet in length, weighing upwards of tons. It has a long, narrow skull, a short neck, a long torso, and a short tail.

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    Four large flippers provide propulsion and steering. Everything about Liopleurodon is large. Its head is 16 feet in length, with 10 foot jaws. Each flipper is 10 feet long.