Extinct genus of dinosaurs
Koutalisaurus (meaning "spoon lizard", in reference to the shape of the dentary) is a potentially dubious genus of extinct hadrosaurid dinosaur from the Arenysaurini. It is based on a mostly complete dentary from the Maastrichtian-age Upper Cretaceous Tremp Formation near the town of Abella de la Conca, Lleida, Spain. 
Discovery and naming.
The holotype dentary, IPS SRA 27, had previously been referred to "Pararhabdodon" in 1999, but comes from a different locality, is based on non-comparable material, and has unusual characteristics, leading Prieto-Marquez "et al." (2006) to place the dentary in the new species "Koutalisaurus kohleorum". "Koutalisaurus" was later found to be an invalid "nomen dubium", although later studies do not reflect this hypothesis and still classify "Koutalisaurus" as a valid genus.
In 2007, a poster presentation and abstract at a conference suggested many of the hadrosaur specimens found at the Basturs Poble bonebed may have belonged to "Koutalisaurus", but they cautioned an adult dentary from the bonebed would need to be discovered to test the hypothesis. This idea was later rejected after the Basturs Poble remains were reclassified as belonging to lambeosaurines such as "Adynomosaurus" and "cf." "Pararhabdodon".
Description.
The dentary is very elongate, and has a long toothless portion (the front of the jaw, including the end where the predentary would have been attached) that is bent steeply downward and inward, which would have given the jaw a spoon-like shape when complete. It is comparable in size, although on the small side and with unusual proportions (see above), compared to dentaries from other hadrosaurids.
Classification.
Prieto-Marquez "et al." (2006) found the animal to be a hadrosaurid, but of uncertain placement within the family. More recent work by Prieto-Marquez and Wagner suggests that it is the same as "Pararhabdodon" as originally thought.
A 2020 study by Nick Longrich and colleagues describing the genus "Ajnabia" found "Koutalisaurus" to be an arenysaurin. The cladogram from their study's phylogenetic analysis is shown below:
References.
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