A newly found ancestor of Thescelosaurus reveals proof that these animals spent not less than a part of their time in underground burrows.
The brand new species contributes to a fuller understanding of life throughout the mid-Cretaceous—each above and under floor.
The brand new dinosaur, Fona [/Foat’NAH/] herzogae lived 99 million years in the past in what’s now Utah. At the moment, the world was a big floodplain ecosystem sandwiched between the shores of a large inland ocean to the east and energetic volcanoes and mountains to the west. It was a heat, moist, muddy atmosphere with quite a few rivers operating by it.
Paleontologists from North Carolina State College and the North Carolina Museum of Pure Sciences unearthed the fossil—and different specimens from the identical species—within the Mussentuchit Member of the Cedar Mountain Formation, starting in 2013. The preservation of those fossils, together with some distinguishing options, alerted them to the opportunity of burrowing.
Fona was a small-bodied, plant-eating dinosaur in regards to the dimension of a big canine with a easy physique plan. It lacks the bells and whistles that characterize its extremely ornamented family reminiscent of horned dinosaurs, armored dinosaurs, and crested dinosaurs. However that doesn’t imply Fona was boring.
Fona shares a number of anatomical options with animals identified for digging or burrowing, reminiscent of giant bicep muscular tissues, sturdy muscle attachment factors on the hips and legs, fused bones alongside the pelvis—possible to assist with stability whereas digging—and hindlimbs which are proportionally bigger than the forelimbs. However that isn’t the one proof that this animal frolicked underground.
“The bias within the fossil report is towards greater animals, primarily as a result of in floodplain environments just like the Mussentuchit, small bones on the floor will typically scatter, rot away, or grow to be scavenged earlier than burial and fossilization,” says Haviv Avrahami, a PhD scholar at NC State and digital technician for the brand new Dueling Dinosaurs program on the North Carolina Museum of Pure Sciences. Avrahami is first writer of the paper describing the work.
“However Fona is usually discovered full, with a lot of its bones preserved within the unique dying pose, chest down with splayed forelimbs, and in exceptionally good situation,” Avrahami says. “If it had already been underground in a burrow earlier than dying, it will have made such a preservation extra possible.”
Lindsay Zanno, affiliate analysis professor at NC State, head of paleontology on the North Carolina Museum of Pure Sciences, and corresponding writer of the work, agrees.
“Fona skeletons are far more frequent on this space than we’d predict for a small animal with fragile bones,” Zanno says. “The most effective clarification for why we discover so a lot of them, and recuperate them in small bundles of a number of people, is that they had been residing not less than a part of the time underground. Basically, Fona did the laborious work for us, by burying itself throughout this space.”
Though the researchers have but to establish the subterranean burrows of Fona, the tunnels and chamber of its closest relative, Oryctodromeus, have been present in Idaho and Montana. These finds help the concept Fona additionally used burrows.
The genus title Fona comes from the ancestral creation story of the Chamorro individuals, who’re the indigenous populations of Guam and the Pacific Mariana Islands. Fo’na and Pontan had been brother and sister explorers who found the island and have become the land and sky. The species title honors Lisa Herzog, the paleontology operations supervisor on the North Carolina Museum of Pure Sciences, for her invaluable contributions and dedication to the sector of paleontology.
“I needed to honor the indigenous mythology of Guam, which is the place my Chamorro ancestors are from,” Avrahami says. “Within the fable, Fo’na turned a part of the land when she died, and from her physique sprung forth new life, which to me, ties into fossilization, magnificence, and creation. Fona was more than likely coated in a downy coat of colourful feathers. The species title is for Lisa Herzog, who has been integral to all this work and found some of the distinctive Fona specimens of a number of people preserved collectively in what was possible a burrow.”
Fona can be a distant relative of one other well-known North Carolina fossil: Willo, a Thescelosaurus neglectus specimen at the moment housed on the museum and likewise thought to have variations for a semifossorial—or partially underground—life-style, analysis that was published late in 2023 by Zanno and former NC State postdoctoral researcher David Button.
“T. neglectus was on the tail finish of this lineage—Fona is its ancestor from about 35 million years prior,” Avrahami says.
The researchers consider Fona is vital to increasing our understanding of Cretaceous ecosystems.
“Fona provides us perception into the third dimension an animal can occupy by transferring underground,” says Avrahami. “It provides to the richness of the fossil report and expands the identified variety of small-bodied herbivores, which stay poorly understood regardless of being extremely integral parts of Cretaceous ecosystems.”
“Folks are inclined to have a myopic view of dinosaurs that hasn’t stored up with the science,” Zanno says. “We now know that dinosaur variety ran the gamut from tiny arboreal gliders and nocturnal hunters, to sloth-like grazers, and sure, even subterranean shelterers.”
The work seems in The Anatomical Record.
Further researchers from the College of Minnesota and Stellenbosch College additionally contributed to the work.
Supply: NC State
