Laboratório de Sistemática e Tafonomia de Vertebrados Fósseis, Setor de Paleovertebrados, Departamento de Geologia e Paleontologia, Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
Institut Català de Paleontologia Miquel Crusafont, Universitat Autònoma de Barcelona, Barcelona, Cataluña, Spain.
PeerJ. 2022 May 3;10:e13276. doi: 10.7717/peerj.13276. eCollection 2022.
was originally described as a purported pterosaur from the Late Triassic (early Norian) Caturrita Formation of southern Brazil. Its holotype comprises fragmentary postcranial elements, whereas a partial maxilla was referred to the species. The assignment of to Pterosauria has been questioned by some studies, but the specimen has never been accessed in detail after its original description. Here we provide a reassessment of after additional mechanical preparation of the holotype. Our interpretations on the identity of several bones differ from those of the original description, and we found no support favoring pterosaur affinities for the taxon. The maxilla previously referred to is disassociated from this taxon and referred to a new putative pterosauromorph described here from a partial skull and fragmentary postcranial elements. gen. et sp. nov. comes from the same fossiliferous site that yielded , but the lack of overlapping bones hampers comparisons between the two taxa. Our phylogenetic analysis places within Lagerpetidae and gen. et sp. nov. as the earliest-diverging member of Pterosauromorpha. Furthermore, the peculiar morphology of the new taxon reveals a new dental morphotype for archosaurs, characterized by conical, unserrated crowns, with a pair of apicobasally oriented grooves. These two enigmatic archosaurs expand our knowledge on the Caturrita Formation fauna and reinforce the importance of its beds on the understanding of Late Triassic ecosystems.
它最初被描述为一种来自巴西南部晚三叠世（诺利阶早期）卡图里塔地层的疑似翼龙。它的正型标本由部分后肢骨骼组成，而部分上颌骨被归入该物种。一些研究对将其归入翼龙目提出了质疑，但在最初描述之后，该标本从未进行过详细研究。在这里，我们在对正型标本进行额外的机械处理后，重新评估了。我们对一些骨骼的身份的解释与原始描述不同，而且我们没有发现支持该分类单元与翼龙有亲缘关系的证据。以前归入的上颌骨与该分类单元无关，而是归入了一个新的翼龙形类，这里描述了一个来自部分头骨和部分后肢骨骼的化石。新属种的正型标本来自同一个产化石的地点，但是缺乏重叠的骨骼，这限制了对两个分类单元之间的比较。我们的系统发育分析将置于喙嘴龙科内，而新属种是翼龙形类中最早分化的成员。此外，新分类单元的特殊形态揭示了恐龙的一种新的牙齿形态型，其特点是锥形、无锯齿的冠部，并有一对从顶部到底部的沟。这两个神秘的恐龙类群扩大了我们对卡图里塔地层动物群的认识，并强调了其对了解晚三叠世生态系统的重要性。
