Adynomosaurus

Adynomosaurus is a genus of lambeosaurine dinosaur from the Late Cretaceous of what is now Catalonia, Spain. First discovered in 2012, it was named in 2019 with the type and only species being Adynomosaurus arcanus. It is only known from scant material, but is distinguished from other hadrosaurs by its weakly developed shoulder blade which would have had underdeveloped musculature, which lends it its scientific name, partially from the Greek word for "weak". Its exact relationships with other hadrosaurs remain unresolved, with it not consistently being recovered as a relative of any other specific genera, though some studies have allied it with Tsintaosaurini or even found it outside of Hadrosauridae. It would have lived as part of a diverse coastal estuary ecosystem, made up of meandering rivers and mud flats. The discovery of Adynomosaurus adds to the very incomplete fossil record of hadrosaurid dinosaurs in the Late Cretaceous of Europe, and it fits into a picture of major ecological turnover that was occurring during the Maastrichtian stage in the region.

==Discovery and naming== thumb|left|Hadrosaur fossils from Serrat del Corb geologic locality, possibly representing Adynomosaurus The Costa de les Solanes locality of the Conques Formation was first discovered in 2012, by a wheat field in the village of Basturs in Catalonia; the site dates to the upper layers of the Maastrichtian. Numerous fossil sites preserving dinosaurs from the Maastrichtian are known from across this region of Spain. After being notified of the site by a local, researchers from the Institut Català de Paleontologia Miquel Crusafont and the Universitat Autònoma de Barcelona carried out excavations at the site during 2012 and 2013. The associated but remains of a hadrosaur were discovered in this time, including a partial left , a number of partial , a left , a left , a partial rib, and numerous pelvic and partial hindlimb bones. Due to the presence of two left tibia, it was concluded the material belonged to at least two different individuals. The specimens are held at the Museu de la Conca Dellà in Lleida, Spain. This would first be reported in an abstract for a presentation at the 78th annual meeting of the Society of Vertebrate Paleontology, with the remains then thought to pertain to a new species of the genus Pararhabdodon.