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Blasisaurus Temporal range: Late Cretaceous, 66 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Skull fossils
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	†Ornithischia
Clade:	†Ornithopoda
Family:	†Hadrosauridae
Subfamily:	†Lambeosaurinae
Tribe:	†Arenysaurini
Genus:	†Blasisaurus Cruzado-Caballero et al., 2010
Type species
†Blasisaurus canudoi Cruzado-Caballero et al., 2010

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Blasisaurus is a genus of lambeosaurine hadrosaurid dinosaur from the Late Cretaceous. It is known from a partial skull and skeleton found in late Maastrichtian-age rocks of Spain.^[1] The type species is Blasisaurus canudoi, described in 2010 by Penélope Cruzado-Caballero, Xabier Pereda-Suberbiola and José Ignacio Ruiz-Omeñaca, a group of researchers from Spain.

The generic name refers to the Blasi 1 site where the fossil was found. The specific epithet honours paleontologist José Ignacio Canudo.^[1] The holotype, MPZ99/667, is housed in Huesca. It was found in a layer of the Arén Formation dating from the upper Maastrichtian, about 66 million years ago.^[1] It consists of a skull with fragmentary lower jaws.^[1]

Blasisaurus was a medium-sized ornithopod. Its describers identified two distinct features: the cheekbone has a rear projection with a hook-shaped upper edge and the lower sleep window^{[clarification needed]} is narrow and D-shaped.^[1] From the same formation is Arenysaurus, a related species. They are distinguished by the shape of the teeth and missing secondary ridges. Blasisaurus also differs from Koutalisaurus by a downward bent front edge of the lower jaw.^[1]

Blasisaurus' discoverers performed an exact cladistic analysis to determine its phylogenetic position, which placed it as the sister taxon to Arenysaurus.^[1] Together they form a tribe, the Arenysaurini, that is more derived than Tsintaosaurus and Jaxartosaurus.^[1] Blasisaurus confirmed the hypothesis that, in the Late Cretaceous, different hadrosaurids from Asia and Europe migrated across land bridges.^[1] Where in Lambeosaurinae Blasisaurus and Arenysaurus belong is disputed. Some put them in the tribe Lambeosaurini^[2] at the base of the lambeosaurin-parasaurolophin split,^[1] some in Parasaurolophini.^[3] Below is the most recent cladogram including Blasisaurus and Arenysaurus, published by Penélope Cruzado-Caballero et al. in 2013:^[3]

• Timeline of hadrosaur research