Argentinadraco (meaning "Argentina dragon") is an extinct genus of alanqid pterosaur from the Late Cretaceous Portezuelo Formation of Argentina. It contains a single species, A. barrealensis, named in 2017 by Alexander Kellner and Jorge Calvo. Argentinadraco is unusual for bearing a bottom jaw with a concave bottom edge, as well as a pair of ridges and depressions on the top surface. These features distinguish it from all other azhdarchoid groups, complicating its assignment, but recent phylogenetic analyses indicate that it belongs to the clade Alanqidae. The ridges on the lower jaw may have
Argentinadraco (meaning "Argentina dragon") is an extinct genus of alanqid pterosaur from the Late Cretaceous Portezuelo Formation of Argentina. It contains a single species, A. barrealensis, named in 2017 by Alexander Kellner and Jorge Calvo. Argentinadraco is unusual for bearing a bottom jaw with a concave bottom edge, as well as a pair of ridges and depressions on the top surface. These features distinguish it from all other azhdarchoid groups, complicating its assignment, but recent phylogenetic analyses indicate that it belongs to the clade Alanqidae. The ridges on the lower jaw may have been used to feed on small invertebrates in loose sediment within the system of lakes and rivers that it resided in.
== Discovery and naming == left|thumb|200x200px|Map showing the location of the Futalognko quarry Argentinadraco is known from a single partial lower jaw, missing the rear end. The specimen is also compressed, especially near the tip of the jaw. Catalogued as MUCPv-1137 in the Centro Paleontológico Lago Barreales (CePaLB) of the National University of Comahue, it was found in layers of yellow sandstone and red/green claystone within the Futalognko quarry, which is located on the northern shore of Lake Barreales. The quarry is northwest of Neuquén, in Neuquén Province, Patagonia, Argentina. Exposed deposits at the site belong to the Portezuelo Formation, a part of the Neuquén Group of the Neuquén Basin, that dates to the Turonian or Coniacian epochs of the Cretaceous period.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).