The 200-million-year-old fossilised stays of an historic ichthyosaur, unearthed on a seaside in south-west England, could also be a part of the most important marine reptile ever discovered.

In 2020, novice fossil hunters stumbled throughout a large chunk of bone at Blue Anchor seaside in Somerset. Upon additional inspection, Dean Lomax on the College of Manchester, UK, and his colleagues rapidly realised that it was a jawbone fragment of a large ichthyosaur – a type of reptile that roamed the oceans between 250 and 90 million years in the past.

Subsequent digs on the seaside have uncovered 11 extra fragments, permitting the workforce to partially piece collectively a bone that sits behind the jaw known as a surangular.

This newest discovery comes after a 2018 report that described a similar ichthyosaur jawbone discovered on a special Somerset seaside. On the time, the workforce didn’t have sufficient proof to find out its species.

“It was very clear that this was one other considered one of these big jawbones,” says Lomax. “So I used to be very, very excited.”

After evaluating the partial surangular with the entire ones of different ichthyosaurs, the workforce estimates that the entire bone was at the least 2 metres lengthy – placing the animal’s physique size at round 20 to 25 metres.

“We’re coping with one thing actually monumental,” says Lomax. “It might definitely signify the most important marine reptile formally described.”

The character of the surangular, which matches the one reported in 2018, means each fossils should have belonged to a beforehand undescribed species of ichthyosaur, says Lomax. The workforce have named it Ichthyotitan severnensis, that means the enormous fish lizard of the river Severn.

The stays date to round 202 million years in the past, simply earlier than a serious international extinction occasion that worn out many species, together with many huge ichthyosaurs.

“They’re fairly actually the final giants,” says Lomax. “No ichthyosaurs obtained anyplace close to this measurement once more.”