The early evolution of dinosaurs is documented by abundant postcranial material, but cranial material is much rarer and comparisons of cranial features among early dinosaurs are limited to only a few specimens. Here, we fully detail the osteology of the unusual early-diverging dinosaur Daemonosaurus chauliodus from the latest Triassic Coelophysis Quarry in northern New Mexico, USA. The taxon possesses a unique and curious suite of character states present in a variety of early dinosaurs, and the morphology of D. chauliodus appears to link the morphology of Herrerasaurus with that of later diverging eusaurichians. Our phylogenetic analyses places D. chauliodus at the base of dinosaurs and our interpretation of the unusual mix of character states of D. chauliodus does not lead to a firm conclusion about its nearest relationships or its implications for the evolution of character state transitions at the base of Dinosauria. The combination of character states of D. chauliodus should not be ignored in future considerations of character evolution in early dinosaurs. As one of the last members of the earliest radiation of saurischians in the Carnian–early Norian, D. chauliodus demonstrates that members of the original diversification of dinosaurs survived until nearly the end of the Triassic Period.

中文翻译：

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新墨西哥腔骨Qu鱼采石场（三叠纪：Rhatian）的早散恐龙Daemonosaurus chauliodus（Archosauria：Dinosauria）的骨学及其与其他早期恐龙的关系

大量的颅后物质证明了恐龙的早期进化，但是颅骨的物质很少，而且对早期恐龙之间的颅骨特征的比较仅限于少数标本。在这里，我们详细介绍了来自美国新墨西哥州北部最新的三叠纪腔骨Qu鱼采石场的不寻常的早散恐龙Daemonosaurus chauliodus的骨骼学。该分类单元拥有一套独特而奇怪的字符集，这些字符集存在于各种早期的恐龙中，而D. chauliodus的形态似乎将Herrerasaurus的形态与后来的不同的Eauaurichians的形态联系在一起。我们的系统发育分析地点D. chauliodus在恐龙的基础上，我们对D. chauliodus角色状态的异常混合的解释并不能就其最近的关系或它对恐龙的角色状态转变的演变得出确切的结论。未来恐龙在字符演化方面的考量中，不应忽略D. chauliodus的字符状态组合。作为saurischians在卡尼早期诺利，最早辐射的最后一名成员D. chauliodus证明恐龙原来的多样化，成员存活到三叠纪时期的近结束。