The new clan and the types of the Khadrosaurids dinosaur, who lived in the Cretaceous period in the fact that he is now New Mexico, was identified and called paleontologists from the United States and the Slovak Republic.
Life reconstruction Ahshislesaurus wumani Based on a pharmaceutical and closely related species. Image Credit: Sergey Krasovsky.
“HadrosauridaeThe family of large grass dinosaurs was one of the most common dinosaurs of the late chalk -ecosystems of the Western internal pool in North America for about 20 million years, ”said the Paleontologist of the state of Montana, Paleontologist Sebastian Dalman and his colleagues from the University of Harrisburgburg, the University of New -York, and the muzuum from Nyu. -Mexico, a natural university and Pavil Ass.
“This group, widely known as dinosaurs with a duck, was one of the most taxonomically diverse and successful groups of dinosaurs during the Cretaceous.”
“Over the past 20 million years of the Cretaceous, the Hadrosaurides have reached a global distribution and attended Africa, Antarctica, Asia, Europe, as well as in North and South America.”
Named Ahshislesaurus wumaniThe new types of Hadrosaurid lived at the end of the chalk, about 75 million years ago.
The petrified dinosaurus bones were found in layers Formation of Kirtland In the wild nature of ah-shi-sl-pah, located in the district of San Juan, New Mexico, between the Canyon Chako and the de-on-sin desert.
“The sample of a holotype consists of an incomplete diagnostic skull, several isolated cranial elements, including the right Yugal, square, gear and surag, and a series of articulated cervical vertebrae,” the researchers said.
“In addition to the housing, several samples of the same layers can also belong to this recently identified type, including a well-preserved left tooth tooth and partial skeleton, as well as two gummeri, one belonging to a large adult.”
In previous studies, Ahshislesaurus wumani was mentioned CritosaurA younger genus of Saurolofin Hadrosavrid from the formation of Kirtland.
Both types are relatively closely related to the subfamily of Hadrosaurid SaurolophinaeField
However, according to phylogenetic analysis, they represent two separate groups that were present in the Cretaceous Age in the South Laramidia campaign.
“Stratigraphically younger Critosaur He is a member of the treasures of Kritosaurini, which includes several northern Laramidy species, ”scientists said.
“In addition, phylogenetic results suggest that a treasure that includes Ahshislesaurus And NepashoibitosaurusAlong with two unnamed species from South Laramidia, separated from Kritosaurini during the late campaign (75 million years ago). ”
According to the team, along with NepashoibitosaurusIN Ahshislesaurus It forms a potentially new group of saiolophynic adrosaurides with a flat head.
“This treasure suggests that the saiolofins were a taxonomically diverse group, which over the past 20 million years of the Cretaceous, was among the dominant herbivores in the south of Laramidia,” the authors said.
“The recognition of new types of Hadrosaurid from New Mexico also provides additional evidence of latitudinal changes in the Hadrosaurid fauna during the late chalk in Laramidia.”
Team paper will be published in Museum of Natural History and Science New MexicoField
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Sebastian Dalman and othersThe field of 2025. New Saurolofin Haddhischia: Hadrosauridae from the upper chalk (campanian) member of the hunter, Kirtland forimation, San San Huts, New Mexico. Museum of Natural History and Science New Mexico 101
