Cryodrakon boreas, gen. et sp. nov., a Late Cretaceous Canadian azhdarchid pterosaur

Azhdarchid pterosaurs have been known since 1972 from upper Campanian deposits of Alberta, Canada. Originally represented by only very fragmentary remains tentatively assigned to the genus Quetzalcoatlus, additional material uncovered over the years has revealed that the taxonomic identity of the Alberta pterosaur material is at odds with this in the light of the growing understanding of azhdarchid diversity. Here, we describe previously undocumented pterosaur remains from Alberta and reassess previously studied material. The specimens collected from the Dinosaur Park Formation can be assigned to a new genus and species Cryodrakon boreas, gen. et sp. nov. The largest elements referable to this taxon suggest that this genus reached sizes comparable to those of other giant azhdarchids.阿兹达奇翼龙类（azhdarchid pterosaurs）自1972年起便在加拿大阿尔伯塔省的坎潘阶（Campanian）上部地层中被发现并记录。最初该类群仅以极其破碎的化石残骸为代表，曾被暂时归入风神翼龙属（Quetzalcoatlus）。随着学界对阿兹达奇翼龙类多样性认知的不断加深，后续多年发掘出的更多化石材料表明，阿尔伯塔省翼龙化石的分类学归属与此前的结论并不一致。本文对此前未被报道过的阿尔伯塔省翼龙化石残骸进行了描述，并对已有的研究材料展开重新评估。产自恐龙公园组（Dinosaur Park Formation）的标本可被归入一个新属新种——北风冰龙（Cryodrakon boreas，gen. et sp. nov.）。该类群的最大体型相关标本显示，此新属的体型可与其他巨型阿兹达奇翼龙类相媲美。