Is ‘Eve the sea monster’ a new plesiosaur species?

A rare, 165-million-year old plesiosaur skeleton discovered in 2014 and donated to the Oxford Museum of Natural History earlier this year remains the subject of intense research as scientists work to find answers to the many mysteries still surrounding the massive marine reptiles.

In January, an 18 foot (5.5 meter) long specimen known as “Eve” was donated by the owners of the Peterborough quarry where it was discovered, museum officials announced at the time. Since then, Dr. Hilary Ketchum, who looks after geological specimens at the center, and her colleagues have been working to clean and repair the creature, according to BBC News.

It takes more than an hour to assemble Eve’s skeleton, the British media outlet explained, calling the fossils “the biggest jigsaw puzzle you’ve ever seen” while adding that, “in this case, there are no instructions on the box.” In addition, museum conservators were working tirelessly to remove a clay encasing from the sea monster’s skull so that it could be analyzed by a CT scanner.

The intense preparation and examination of the remains should shed new light not only on this specific specimen – whose gender remains a mystery, despite its feminine name – but plesiosaurs as a whole, as there is still much to learn about the biology, anatomy and evolution of the marine reptiles that dominated the seas throughout much of the Mesozoic Era.

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A reconstruction of a plesiosaur.

 

Could ‘Eve’ be an entirely new species of marine reptile?

Plesiosaurs are “a type of reptile related to other reptiles like dinosaurs, crocodiles, ichthyosaurs and turtles,” Dr. Ketchum explained to BBC News, “but actually we’re not really sure where they fit in the grand scheme of things.” The creatures had long necks, broad and flat bodies, short tails and four long flippers powered by strong muscles attached to the shoulders and pelvis.

The creatures, which died out approximately 66 million years ago, breathed air, bore live young and may have been warm-blooded, although researchers are not yet certain about this. Experts at the museum have already scanned Eve’s skull once to explore how the bones and the teeth were positioned in the block of clay, and they hope that using more powerful CT scanning equipment at the University of Bristol will help them determine if this creature is a new species.

“It’s really clear in these high-resolution scans that we’ve got lots of really well-preserved bones that are going to give us lots of information,” Dr. Roger Benson, a vertebrate paleontologist at Oxford University, BBC News. “From what we’ve seen already… we know it has some features that are different to the other animals that we’ve seen,” he said.

Dr. Benson noted that it is “very likely that this is an animal that is new to science,” but pointed out that additional analysis will be required before that can be confirmed. “We think it’s possibly a new species,” added Dr. Ketchum, who is also the Earth Collections manager at the Oxford Museum, “but even if it’s not, it’s very unusual. They’re very rare fossils – plesiosaurs, especially nearly complete ones like this.”

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Image credit: Oxford Museum of Natural History