A new genus and species of Monophenestratan pterosaur has been identified from partial and postcranial fossils discovered in the Chubut province of Patagonia, Argentina. named Mercamtel Pateco an ancient flying reptile that predates the currently oldest members of the Monophenestrata clade by at least 8 million and perhaps 10 million years.

Mercamtel Pateco They lived in what is now Argentina during the most recent Early Jurassic period, 184 to 174 million years ago.

The ancient species is a member of Monophenestrata a large clade of pterosaurs consisting of Darwinoptera, Anurognatidae, and Pterodactylidae.

“Pterosaurs were the first clade of actively flying tetrapods that achieved great success during the Mesozoic Era, achieving a worldwide distribution from the Triassic to the Cretaceous.” Dr. Alexandra Fernandes researchers from the Bavarian National Institute of Paleontology and Geology and colleagues in Germany and Argentina.

“Meanwhile, the pterosaur Bauplan transitioned from the basal non-monophenestratan ‘non-pterodactyloid’ body shape to a more derived pterodactyloid body shape. ”

“This evolutionary event has become better understood in recent years with the recognition of the Darwinoptera clade. Darwinoptera primarily exhibit a variety of morphological attributes during this transition and are considered to be “non-pterodactyl”. It has been considered to be an “intermediate” monofenid, combining the plesiomorphic features of “.” It has wing-like characteristics. ”

“Records of Mesozoic pterosaurs are abundant in the Northern Hemisphere, but records from the Southern Hemisphere are relatively sparse.”

“Although it is possible that Argentinians may be excluded, all carpNon-pterodactyl monophenestratan pterosaurs have so far been found only in the Northern Hemisphere, namely Britain, Germany, and China, and first appeared during the Batonian period (168 to 165 million years ago). ). ”

“The apparent success of these monofenid forms and their pterodactyl descendants replaced the Rhamphorhynchus body form (which disappeared in the early Cretaceous) and survived until extinction at the end of the Cretaceous.”

“However, there is still a lack of knowledge about monofenestral stratus in nonpterodonts, especially in terrestrial depositional environments.”

discovered by paleontologists Mercamtel PatecoThe fossilized remains of – a portion of the skull, two associated teeth, and some postcranial elements – are located at the Queso Lajad site in the Canadon Asphalt Formation.

They also found an isolated tooth of a ctenochasmatid pterosaur pterosaur at the same location.

“The Canadon Asphalt Formation is widespread in the north-central Chubut province of Argentina,” they said.

“This is part of the deposits of the Canadon Asphalt Basin, a large half-graben structure in central Patagonia that opened with the onset of the South Atlantic during the Early Jurassic.”

“The production area of ​​Queso Laryado is located approximately 5.5 km northwest of the village of Cerro Condor in the middle reaches of the Rio Chubut River.''

“The Fossil Formation is a 0.8 meter thick carbonate, partially silicified mudstone underlying the Canadon Asphalt Formation.”

According to the researchers, Mercamtel Pateco This marks the world's earliest appearance of a monophenestratan pterosaur, predating the current oldest member of this clade by at least 8 million and perhaps 10 million years.

This species is also the first and only non-pterodactyl monophenestratan to inhabit the supercontinent of Gondwana.

“Mercamtel Pateco “This is the most conclusive evidence to date for the existence of Monophenestrata in the Late Late Jurassic, and the novel traits expressed in this new species also contribute to morphological diversity.” The scientists concluded.

“Furthermore, if confirmed by future discoveries, the possible existence of Ctenochasmatidae, currently indicated by a single tooth, would not only place the origin of pterodactyls in the Early Jurassic, but also their early diversification. It may even indicate that it already happened in that era.”

“While our understanding of long-term pterosaur diversity and dispersal has traditionally been dominated by Northern Hemisphere Lagerstätten, high phylogenetic diversity of Early Jurassic pterosaurs also existed in Gondwana. It is now clear that the Canadon Asphalt Formation is the only one that now shows evidence for at least three different species. ”

“This further highlights that we still lack knowledge about the Jurassic pterosaur fauna of Gondwana, and while we await further field sampling and recovery of pterosaur fossils, the southern hemisphere probably someday It is clear that there is an inherent potential to match the abundance of the hemisphere. “

discovery of Mercamtel Pateco is reported in paper in a diary Royal Society Open Science.

_____

Alexandra E. Fernandez others. 2024. The oldest monophenestratan pterosaur from the Queso Rayado region (Toarcian, Canadon Asphalt Formation), Chubut Province, Patagonia, Argentina. R. Soc. Open Science 11(12):241238;doi: 10.1098/rsos.241238