Montana

Tiny extinct crocodyliform with unusual teeth discovered in Montana

Published

5 months ago

September 23, 2025

Tiny extinct crocodyliform with unusual teeth discovered in Montana

An artistic rendering of Thikarisuchus xenodentes, an extinct crocodyliform from the Cretaceous of Montana. Credit: Dane Johnson/Museum of the Rockies

About 95 million years ago, a juvenile crocodyliform nicknamed Elton lived in what is now southwest Montana at the edge of the Western Interior Seaway.

Measuring no more than 2 feet long from nose to tip of tail, young Elton was about the size of a big lizard, according to Montana State University professor of paleontology David Varricchio. Had it lived to be full grown, Elton would have measured no longer than 3 feet, far smaller than most members of the Neosuchia clade to which it and its distant relatives belong.

The clade includes modern crocodilians and their closest extinct relatives, almost all of them semiaquatic or marine carnivores with simple, conical teeth.

Elton, by contrast, lived on the land, probably feasting on both plants and insects or small animals with its assortment of differently shaped and specialized teeth. Its unique anatomy reveals that it was part of a new, previously unrecognized family of crocodyliforms endemic to the Cretaceous of North America.

If not for the sharp eye of Harrison Allen, a 2023 graduate of MSU’s Department of Earth Sciences in the College of Letters and Science, Elton’s ancient remains may never have been discovered. But during a dig in the summer of 2021 in the Blackleaf geological formation on U.S. Forest Service land near Dillon, Allen—then a student in Varricchio’s field paleontology course—noticed a fossil the size of the tip of his pinkie with a “weird texture on it.”

“I brought it to Dr. Varricchio and knew it must be something good, because he said, ‘Take me to where you found this,’” said Allen, who is now studying croc paleontology as a doctoral student at Stony Brook University in New York.

It was an exciting moment for Allen, originally from Kentucky, who chose MSU because it offers a paleontology track for undergraduates majoring in earth sciences.

Four years and hundreds of hours of study later, he is the lead author of a paper published in the Journal of Vertebrate Paleontology that describes the morphology and scientific significance of the creature whose remains he found in the Blackleaf Formation.

“After the dig, Dr. Varricchio told me why he was so excited the day I found the initial specimen. It had so much visible anatomy to explore, and he could see it was a tiny, tiny croc skull, fully articulated and preserved—it was a special thing,” Allen said.

“We have found dinosaurs (in the Blackleaf) before, but this was the second known vertebrate animal we’d ever found in this formation.”

The extinct animal, which Allen and the paper’s co-authors later named Thikarisuchus xenodentes for its strange, sheathed teeth, has provided new information about the paleoecology of the Blackleaf ecosystem and about patterns of evolution in the croc family tree.

It also provided the ultimate undergraduate research project for Allen, who delved into the painstaking process of excavating, sifting and reconstructing the Thikarisuchus remains with the help of some fellow students.

“As an undergraduate student new to research, I nervously went up to Dr. Varricchio and asked if I could study this specimen,” Allen said. “It led me down the rabbit hole into this amazing world of prehistoric, extinct crocs and their evolutionary niches.”

The day after Allen recovered the first piece of skeleton, he and his classmates scooped up several bags of sediment from the mound where it was found.

Back in Bozeman, Allen and his friend Dane Johnson, who graduated in 2022 and is now a paleontology lab and field specialist at MSU’s Museum of the Rockies, spent between 10 and 20 hours sifting out fine particulate matter and dirt, eventually recovering dozens of tiny pieces of the Thikarisuchus skeleton that collectively fit into the palm of Allen’s hand.

As they worked, they listened to music, including Elton John’s 1970s hit “Crocodile Rock.” The nickname “Elton” stuck, long before the specimen was assigned the scientific name that reflects its physical traits.

Allen and Johnson recovered bits of bone from almost all areas of the animal’s body, including its limbs, vertebrae, jaw and 50-millimeter-long skull. Because the fragments were tiny and exceptionally fragile, the students didn’t attempt to physically reassemble them.

Instead, they took them for a series of CT scans, including some at MSU’s Subzero Research Laboratory. Allen estimates that he spent well over 100 hours coloring the digital, 2D segment slices that the scans produced, a process necessary to visually distinguish the bones from the rocks they were embedded in.

“Harrison worked super hard to digitally reconstruct the animal, and it came out beautifully,” said Varricchio.

During the process, Allen discovered that the bones of Thikarisuchus were densely concentrated and organized in a manner consistent with fossils of organisms found in burrows in the Blackleaf Formation and the nearby Wayan Formation in Idaho.

He said this suggests that Thikarisuchus was likewise preserved within a burrow, further supporting the notion that fossils recovered from these formations are biased toward those that were preserved in burrows.

The specimen also presented clues about Thikarisuchus’ newly named family group Wannchampsidae and a similar group found in Eurasia known as Atopasauridae.

Both groups were tiny and terrestrially adapted, and they shared certain cranial and dental features found in another more distantly related group from the Cretaceous of Africa and South America.

“It suggests that during the same time period, we’re seeing convergent evolution between two distantly related groups due to similar environmental conditions, prey availability and who-knows-what that prompted crocs on opposite sides of the planet to develop similar features,” Allen said.

As he works toward his Ph.D. and a career as a paleontology professor, Allen said his experiences with Elton cemented his research interest, which has since broadened to include extinct crocs from all over the world.

“The majority of diversity of crocodyliforms is in the past. There were fully marine crocs, fully terrestrial crocs, herbivorous crocs, omnivores and some that cracked shells,” he said. “That amazed me and made me want to get into this more specific realm of paleontology.”

Varricchio said he feels fortunate that students like Allen choose to study at MSU.

“It was a true pleasure to have Harrison as a student here—so much positive enthusiasm, followed up with great research,” he said.

More information:
Harrison J. Allen et al, A new, diminutive, heterodont neosuchian from the Vaughn Member of the Blackleaf Formation (Cenomanian), southwest Montana, and implications for the paleoecology of heterodont neosuchians, Journal of Vertebrate Paleontology (2025). DOI: 10.1080/02724634.2025.2542185

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Tiny extinct crocodyliform with unusual teeth discovered in Montana (2025, September 23)
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Montana

Apparent AI Glitch in Filing by Montana Public Defender, Recent Congressional Candidate

Published

4 hours ago

March 2, 2026

Press Room

Apparent AI Glitch in Filing by Montana Public Defender, Recent Congressional Candidate

Everyone makes mistakes, even experienced professionals; a good reminder for the rest of us to learn from those mistakes. The motion in State v. Stroup starts off well in its initial pages (no case law hallucinations), but is then followed by several pages of two other motions, which I don’t think the lawyer was planning to file, and which appear to have been AI-generated: It begins with the “Below is concise motion language you can drop into …” language quoted above.

Griffen Smith (Missoulian) reported on the story, and included the prosecutor’s motion to strike that filing, on the grounds that it violates a local rule (3(G)) requiring disclosure of the use of generative AI:

The document does not include a generative artificial intelligence disclosure as required. However, page 7 begins as follows: “Below is concise motion language you can drop into a ‘Motion to Admit Mental-Disease Evidence and for Related Instructions’ keyed to 45-6-204, 45-6-201, and 4614-102. Adjust headings/captions to your local practice.” Page 10 states “Below is a full motion you can paste into your pleading, then adjust names, dates, and styles to fit local practice.” These pages also include several apparent hyperlinks to “ppl-ai-file-upload.s3.amazonaws,” “ppl-ai-fileupload.s3.amazonaws+1,” and others. The document includes what appears to be an attempt at a second case caption on page 12. It is not plausible on its face that any source other than generative AI would have created such language for a filed version of a brief….

There’s more in that filing, but here’s one passage:

While generative AI can be a useful tool for some purposes and may have greater application in the future, when used improperly, and without meaningful review, it can ultimately damage both the perception and the reality of the profession. One assumes that Mr. Stroup has had, or will at some point have, an opportunity to review the filing made on his behalf. What impression could a review of pgs. 12-19 leave upon a defendant who struggles with paranoia and delusional thinking? While AI could theoretically one day become a replacement for portions of staff of experienced attorneys, it is readily apparent that this day has not yet arrived.

The Missoulan article includes this response:

In a Wednesday interview, Office of Public Defender Division Administrator Brian Smith told the Missoulian the AI-generated language was inadvertently included in an unrelated filing. And he criticized the county attorney’s office for filing a “four-page diatribe about the dangers of AI” instead of working with the defense to correct her mistake.
“That’s not helping the client or the case,” Smith said, “and all you are doing is trying to throw a professional colleague under the bus.”

As I mentioned, the lawyer involved seems quite experienced, and ran for the Montana Public Service Commission in 2020 (getting nearly 48% of the vote) and for the House of Representatives in Montana’s first district in 2022 (getting over 46% of the vote) and in 2024 (getting over 44%). “Его пример другим наука,” Pushkin wrote in Eugene Onegin—”May his example profit others,” in the Falen translation.

Thanks to Matthew Monforton for the pointer.

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Montana

Your guide to local sports events, plus what’s on TV

Published

16 hours ago

March 2, 2026

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Your guide to local sports events, plus what’s on TV

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Montana

Montana Department of Agriculture focusing on innovation in 2026

Published

1 day ago

March 1, 2026

Press Room

Montana Department of Agriculture focusing on innovation in 2026

HELENA — You probably have goals and plans for 2026—the Montana Department of Agriculture does too.

“We’re really focusing on innovative agricultural practices,” Montana Department of Agriculture director Jillien Streit said.

It’s no secret that agriculture—farming and ranching—is not easy. There are long days, planning, monitoring crops and livestock, and other challenges beyond farmers’ and ranchers’ control.

(WATCH: Montana Department of Agriculture focusing on innovation in 2026)

Montana Department of Agriculture focusing on innovation in 2026

“We have very low commodity prices across the board,” Streit said. “We still have very high input prices across the board, and we have really high prices when it comes to our equipment, and so, it’s a really tough year.”

But innovation, including new practices, partnerships and technology use, can help navigate some of those challenges.

“We can’t make more time and we can’t make more land, so we need to start putting together innovative practices that help us maximize what our time and land can do,” Streit said.

Practices range from using technology like autonomous tractors and virtual fencing—allowing rangers to contain and move cattle right from their phones—to regenerative farming and ranching.

“It is bringing cattle back into farming operations to be able to work with cover cropping practices to invigorate the soil for new soil health benefits,” Streit said.

The Montana Department of Agriculture is working to help producers learn, share, and collaborate on new ideas to work in their operations.

The department will share stories of practices that work from farms and ranches across the state. Also, within the next year or so, Streit said the department is hoping to roll out technology to help producers collaborate.

“(It’s) providing a communication platform where people can get together and really help each other out by utilizing each other’s assets,” she said.

While not easy, agriculture is still one of Montana’s largest industries, and Streit said innovating and sharing ideas across the state can keep it going long into the future.

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