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Christie’s Pulls T. Rex From Auction, Citing Need for ‘Further Study’

Christie’s said Sunday that it was withdrawing a Tyrannosaurus rex skeleton that it had been planning to auction this month in Hong Kong, where it was initially expected to fetch between $15 million and $25 million, after questions were raised about the number of replica bones used in the specimen and the way it was described in marketing materials.

“After consultation with the consignor of the Tyrannosaurus rex scheduled for sale on 30 November in Hong Kong, Christie’s has decided to withdraw the lot,” a spokesman for Christie’s, Edward Lewine, said in a statement. “The consignor has now decided to loan the specimen to a museum for public display.”

Asked about the reason for the withdrawal, Mr. Lewine said the auction house believes the specimen would “benefit from further study.”

The news came 10 days before the scheduled sale.

The T. rex, which the auction house called Shen, had been billed as the first skeleton of its species to appear at auction in Asia. A Christie’s news release touted the specimen as “museum standard” and “a world-class specimen.”

But questions about the fossil were raised in recent weeks, when a lawyer for the Black Hills Institute of Geological Research, a fossil company in South Dakota, reached out to Christie’s about similarities between Shen and another T. rex skeleton, named Stan, which Christie’s had sold in 2020 for a record $31.8 million.

Although Stan was auctioned off, the Black Hills Institute retained intellectual property rights on the specimen, allowing it to continue selling painted polyurethane casts of the skeleton, which are currently priced at $120,000 each.

Peter Larson, the company’s president, said in an interview that when he first saw a photo of Shen, the skeleton Christie’s was preparing to auction in Hong Kong, he noticed that the skull looked similar to Stan’s skull, including holes in the lower left jaw that Mr. Larson said were unique to Stan. Mr. Larson and his colleagues at Black Hills had examined the particularities of Stan’s bones over three decades after excavating the specimen starting in 1992.

Mr. Larson said that it appeared to him that the owner of Shen — who was not identified by Christie’s — had bought a cast of Stan from Black Hills to supplement the original bones.

“They’re using Stan to sell a dinosaur that’s not Stan,” Mr. Larson said in an interview with The New York Times a few days before the sale was called off. “It’s very misleading.”

On Sunday, after the decision was made to withdraw, Mr. Larson said, “Christie’s did the right thing.”

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After a lawyer for Mr. Larson’s company, Luke Santangelo, contacted Christie’s this fall with concerns that the online auction materials did not make clear to the public that the specimen included casts of Stan, the auction house added a note to its online auction materials.

“Replica bones that were added to original bones (referred to as STAN™ elements) were created by, and purchased from, Black Hills Institute of Geological Research, Inc.,” read a note added to the bottom of a web page advertising the specimen.

The auction house’s catalog confirmed that none of Shen’s teeth are original. Excavated from Montana in 2020, the bones were described in the catalog as “well-preserved and quite solid,” and with pathologies that included bite marks and osteoarthritis.

Fossil auction sales have been booming in recent years, and earlier this year, Christie’s sold the remains of a raptor for $12.4 million, more than double the auction house’s high estimate. The withdrawal is a significant loss for the auction house, which made Shen the headliner of its weeklong sales in Hong Kong that begin next week.

Nearly all dinosaur skeletons are incomplete, requiring casts of other specimen’s bones or reconstructed additions to appear whole. How much of a skeleton is fake depends on the amount of original bone.

Christie’s said in its marketing materials that Shen was “54 percent represented by bone density,” a measure that some fossil experts questioned.

The auction house’s catalog notes that the Shen specimen has about 79 original bones; the total bone count for a T. rex is not known with certainty and can vary depending on how they are counted, but some scientists have estimated that they contain 300, and others 380.

Stan, a T. rex skeleton, sold in 2020 for $31.8 million. One of the paleontologists who excavated Stan noticed similarities between its skull and that of Shen’s, the skeleton Christie’s had planned to auction this month. Credit…Ali Haider/EPA, via Shutterstock

In comparison, Stan, the specimen sold in 2020, has 190 original bones, according to research on the specimen. And Sue, the famous T. rex that was also excavated by Black Hills and auctioned off to the Field Museum of Natural History, in Chicago, has 250, the museum said, a figure that includes a set of rib-like bones across the belly that are sometimes not included in total bone counts.

Mr. Santangelo, the lawyer, said that he had urged Christie’s to alter any descriptions that were “potentially misleading the public” about Shen, including its claim that the dinosaur was “54 percent represented by bone density.”

Fossil experts had questioned the meaning of that figure, which Christie’s had earlier explained as helping to provide more weight to, for example, a massive femur bone compared to a tiny ear bone.

“Bone density has no scientific meaning whatsoever,” said Margaret Lewis, president of the Society of Vertebrate Paleontology, a professional group that vocally opposed the auction of Stan in 2020.

Auctions like this one have drawn criticism from paleontologists at museums and universities who fear that scientifically important specimens could end up privately owned and out of the reach of researchers.

John R. Nudds, one of the researchers credited with having studied Shen and a central figure in the auction house’s advertisements, acknowledged in an interview before the withdrawal that by bone count, roughly three quarters of the original bones in the specimen were casts of Stan.

Dr. Nudds, who said he retired as a lecturer in paleontology at the University of Manchester two years ago, said he did not think the existence of cast elements in Shen had been obscured.

“I don’t think that’s ever been hidden,” said Dr. Nudds, who added that he consulted on the specimen for the private owner, not Christie’s. “I think it’s pretty obvious that if a skeleton is 54 percent by bone density, then 46 percent by bone density has got to be cast — there’s no other way around it.”

David A. Burnham, a preparator in vertebrate paleontology at a University of Kansas museum, who is also identified as having studied Shen, explained in the report how he calculated the “bone density” figure. The 54 percent figure was calculated by “computing the area of each individual bone represented using measuring software,” he said.

A third author listed on the Shen report, Bruce M. Rothschild, a former research associate with the Carnegie Museum of Natural History, denied involvement in its publication, though he had offered Dr. Burnham his opinion on images of a few different T. rexes.

Dr. Rothschild said in an interview that he had believed that the specimens belonged to the University of Kansas when he offered his opinions. “I wouldn’t want to be associated with anything being auctioned,” he said in an interview.

Stan’s buyer was anonymous, but earlier this year, National Geographic reported that the dinosaur would be featured in a developing natural history museum in the United Arab Emirates.

Mr. Larson’s company has sold about 100 casts of Stan, including to the Smithsonian National Museum of Natural History, providing a significant portion of its income. He said he had been concerned that any buyer of Shen would assume the right to make and sell their own copies.

“It was jeopardizing our copyright and our trademark,” Mr. Larson said.

As the company’s lawyer negotiated with Christie’s over the past several weeks, some information in the auction house’s online materials were modified. A line in the news release about Shen being “auctioned with full rights and all soft assets relating to it” disappeared. And the $15 million to $25 million estimate was altered, reading only, “estimate on request.” Then, on Sunday, the sale was called off.

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