A brand new species of ornithopod dinosaur has been recognized in Texas

A brand new genus and species of small-bodied ornithopod dinosaur has been described from a partial jawbone found in Texas, USA.

A model of the ornithopod dinosaur Qantassaurus intrepidus, a distant relative of Ampelognathus coheni.  Image credit: Paliocolor.

Mannequin of an ornithopod dinosaur An intrepid kantasaurusClose to far Ampilognathus cohenii. Picture credit score: Paliocolor.

Ampilognathus cohenii It lived in the course of the center Cretaceous interval, about 96 million years in the past, alongside the shore of the shallow sea route that divided North America into japanese and western land plenty at the moment.

“The ‘center’ Cretaceous was a interval of nice change in terrestrial ecosystems in North America,” stated Christopher Noto, a paleontologist on the College of Wisconsin-Parkside, and his colleagues.

“Vertebrate species of Asian origins started to cross the newly established Beringia contact and seem within the North American fossil document, angiosperms have been on their strategy to dominating land vegetation, and beforehand numerous North American teams declined or disappeared from the fossil document.”

“The intrusion of the Western Inside Sea Route in the course of the Cenomanian Interval (100.5 to 93.9 million years in the past) divided the continent into land plenty from Appalachia to the east and Laradidia to the west, creating situations for the unbiased evolution of terrestrial organisms on all sides of the continent.” The western inside till its widespread decline in Maastrichtian instances (72.1 to 66 million years in the past).”

Ampilognathus cohenii He was a member of the dinosaur department Ornithopoda It was the sister species to the ornithopods group Thecelosaurus And Iguanodontia.

The principally full left jawbone of the brand new species was collected by publicity to Louisville Formation (Woodbine Assortment) Alongside an emergency spillway at Grapevine Lake, in northern Tarrant County, Texas.

“The Woodbine Group deposits uncovered in northeastern Texas have been deposited alongside the southwestern fringe of Appalachia as a sequence of nearshore marshes, shoreline, distal lowlands, lakes, and fluvial deposits in the course of the decline of the Western Inside Seaway within the Early and Center Cenomanian,” the paleontologists stated.

“The Lewisville Formation (Higher Woodbine Group) preserves essentially the most numerous terrestrial fossil assemblage recognized from Appalachia, however stays of small ornithischian dinosaurs have been conspicuously absent from it.”

In response to the crew, Ampilognathus cohenii It’s the first small-bodied ornithopod dinosaur found from the Lewisville Formation.

“The significance of this discovery is that it offers a beforehand lacking however anticipated factor on this historic ecosystem,” stated Dr. Noto.

“Naming a brand new species is all the time thrilling, as a result of it means we’re including new data to science.”

Ampilognathus coheniiIt’s important as a result of it represents the primary acknowledged small-sized herbivore from the Woodbine Group.

“Up thus far we had only a few herbivores and solely certainly one of them was a dinosaur, so it was one thing of a thriller.”

“This fossil helps fill that hole and advances our understanding of how the terrestrial ecosystem was structured at Woodbine greater than 95 million years in the past.”

The invention is described in A paper Revealed on October 13, 2023 in Journal of Vertebrate Paleontology.


ronald s. Tekoski et al. The primary small-bodied ornithopod dinosaur from the Lewisville Formation (center Cenomanian) of Texas. Journal of Vertebrate Paleontology, revealed on-line October 13, 2023; doi: 10.1080/02724634.2023.2257238

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