The fossil scientists have discovered fossil residue of new and unusual dinosaurs with atypical hands in Mongolia.
Duonychus TsogtbaaArati He lived in what Mongolia is now known during the late Cretaceous period, between 95 and 90 million years.
The new species belong to theerizinosauriaA group of dinosaurs TheroPod, or both that lived in Asia and North America during the Cretaceous era.
“Theerizinosauria is a Clade from the unusual or appetite Dinasers known from the chalk deposits in Asia and North America.”
“This Clade can be recognized more than their three hands (three fingers) wearing three unlikely similar to the mixtures. theerizinosaurus From the latest Cretaceous era from Mongolia. “
“More primitive members in Clade like Vacuriusand BeipiaosaurusAnd Jianchangosaurus Agnis had a relatively smaller compared to more derived forms, such as Erliansaurusand NuchronychusIn particular theerizinosaurus“
“Since the aeropods or a comprehensive or long necks and small teeth in the form of a sheet of paper, the development of their unusual hands is likely to have an important role in the nutrition environment in this Clade.”
According to excavation scientists, Duonychus TsogtbaaArati It is medium -sized treizinosaur, with a steroid body mass of about 260 kg.
This dinosaur fossil Bayanshiree formation In the Jobi Desert, ömnögovi province, southeast of Mongolia.
“The sample consists of a partial skeleton, including: six articulated backgrounds, six articulated vertebrae with sacred ribs, frontal vertebrae, some dorsal ribs, right, right, right, right, right, right, right, right, right, right, right, right, right, right, right, right The right, researchers wrote the party close to the left Iisha.
A skeleton was rebuilt and selected elements from Duonychus TsogtbaaArati. Credit image: Kobayashi And others. DOI: 10.1016/J.isci.2025.112141.
Duonychus TsogtbaaArati It differs from the other theerizinosaurs in that the hand has only two fingers, instead of three fingers.
The scientists wrote: “With regard to the other Treizinosaurss instrument, this new type is unique in having DistyPtyl (two of the wicked fingers).”
“The sample-from the non-Paravos THEPODS-keeps a three-dimensional sheath represents the corneal claw.”
The sample that is well preserved Duonychus TsogtbaaArati It provides an insight into the functional aspects of her hands.
“Based on the abdominal curvature and the angle of the parameters, the attack in the claw, the corneal claw is preserved Duonychus TsogtbaaArati “It reveals functions within the scope of examination (climbing), Tenasorial (struggle) for archives (constipation),” the authors wrote.
“Of these functions, the herbes diet, or completely and the size of the body Duonychus TsogtbaaAratiAs in other Theizinosaurids, it would propose moderate use as claws understand the branches as in the chameleon and some mammals (for example, southern Tamando, ANTEARTER), instead of climbing trees (for example, squirrel), or to understand, seize or manipulate Betty (EG, Bords, Filides). “
“Although there are only two functional numbers, Duonychus TsogtbaaArati It is likely to be an effective branch, given the severe curvature in the informal joint and the strong curvature of the corpse, is unknown to other benzine. “
Based on the form of informal dimensions and corneal claw dimensions, Duonychus TsogtbaaArati It can have branches or areas of plants up to about 10 cm in its diameter, which is less than the diameter of those who have been understood theerizinosaurusThis indicates this Duonychus TsogtbaaArati Perhaps it was more selective in feed behavior. “
Manus Duonychus TsogtbaaAratiWith its strong, informal, curved bending, more support supports the therizinosaurs output derivative in the function of the fire or hook and fetch of the vegetation during the feeding as previously proposed. “
“Although claws usually have a dominant function, probably for hook feed and the stadium in most of the derivative Therizinosaurs, these structures could have been used for other purposes, such as regional, defense, flirting, play, etc.”
“In addition to the unexpected morphological diversity of Mans Theizinosaur (i.e., DIDACTYLY), Duonychus TsogtbaaArati They concluded and concluded that the richness of the largest species of Theizinosaurs in the ecosystems of Bayanshiree formation of what he previously realized.
team paper It was published on March 25 in the magazine Iscience.
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Yoshitsugu Kobayashi And others. Didactyl theerizinosaur with the corneal claw reserved from the late Cretaceous period of Mongolia. IscienceIt was published on the Internet on March 25, 2025; DOI: 10.1016/J.isci.2025.112141