Blasisaurus

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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
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Order:	†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

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.

Naming and discovery[]

The generic name refers to the Blasi 1 site where the fossil was found. The specific epithet honours paleontologist .^[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 old.^[1] It consists of a skull with fragmentary lower jaws.^[1]

Description[]

Blasisaurus was a medium-sized ornithopod. The describers have been able to identify two distinct features: the cheekbone has a rear projection with a hook-shaped upper edge, and the lower sleep window is narrow and D-shaped.^[1] From the same formation is Arenysaurus, a related species. They are not identical, distinguished by the shape of the teeth and missing secondary ridges. Blasisaurus also differs from Koutalisaurus by a downwardly bent front edge of the lower jaws.^[1]

Phylogeny[]

The describers performed an exact cladistic analysis to determine its phylogenetic position. The outcome of the phylogenetic analysis placed Blasisaurus as the sister taxon to Arenysaurus.^[1] Together they form a tribe, the Arenysaurini, that is more derived than Tsintaosaurus and Jaxartosaurus. Whether this clade was more derived than Amurosaurus, the closest relative of the group, was not determined.^[1] One study did find that they were not sister taxa, however this has not been supported by any subsequent studies.^[2] Blasisaurus confirmed the hypothesis that in the Late Cretaceous, different hadrosaurids from Asia and Europe was a sign that they migrated across land bridges that must have been present.^[1] Where exactly in Lambeosaurinae Blasisaurus and Arenysaurus fall is disputed. They have been found to be in the tribe Lambeosaurini^[3] at the base of the lambeosaurin-parasaurolophin split,^[1] and in Parasaurolophini.^[2][4] Below is the most recent cladogram published including Blasisaurus and Arenysaurus, found by et al. in 2013:^[4]

See also[]

• Timeline of hadrosaur research

References[]

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