Puercosuchus traverorum n. gen. and sp.: a new malerisaurine azendohsaurid (Archosauromorpha: Allokotosauria) from two monodominant bonebeds in the Chinle Formation (Upper Triassic, Norian) of Arizona

Non-archosaur archosauromorphs are a paraphyletic group of diapsid reptiles that are important members of global Middle Triassic and Late Triassic continental ecosystems. Included in this group are the azendohsaurids, a clade of allokotosaurians (kuehneosaurids and Azendohsauridae + Trilophosauridae) that retain the plesiomorphic archosauromorph postcranial body plan but have evolved disparate cranial features that converge on later dinosaurian anatomy, including sauropodomorph-like marginal dentition and ceratopsian-like postorbital horns. Here we describe a new malerisaurine azendohsaurid from two monodominant bonebeds in the Blue Mesa Member, Chinle Formation (Late Triassic, ~218–220 Ma); the first occurs at Petrified Forest National Park and preserves a minimum of eight individuals of varying sizes, and the second occurs near St. Johns, Arizona. Puercosuchus traverorum n. gen. and sp. is a carnivorous malerisaurine that is closely related to Malerisaurus robinsonae from the Maleri F..., ,

非主龙支系的主龙形类（Non-archosaur archosauromorphs）是一类并系群（paraphyletic group）双孔类爬行动物，为全球中三叠世与晚三叠世陆相生态系统的关键组成类群。该类群涵盖阿曾霍龙科（azendohsaurids）——异弓龙类（allokotosaurians，包含库恩龙科（kuehneosaurids）与由阿曾霍龙科+三尖龙科（Trilophosauridae）构成的演化支）的一个演化支；该支系保留了祖征性的主龙形类躯干骨骼构型，却演化出了迥异的头骨特征，趋同于后期恐龙的解剖结构，包括类蜥脚形亚目的边缘齿列以及类角龙目的眶后角。
本次研究描述了产自钦利组（Chinle Formation）蓝台地段（Blue Mesa Member，晚三叠世，约2.18~2.20亿年）两处单种骨层的新属新种马莱里龙类阿曾霍龙类化石：其一发现于石化林国家公园（Petrified Forest National Park），保存了至少8具不同体型的个体；其二发现于亚利桑那州圣约翰斯附近。普埃尔科苏丘斯·特拉沃罗鲁姆（Puercosuchus traverorum n. gen. and sp.）为肉食性马莱里龙类，与产自马莱里组的Malerisaurus robinsonae亲缘关系密切。