A new unusual tapejarid (Pterosauria, Pterodactyloidea) from the Early Cretaceous Romualdo Formation, Araripe Basin, Brazil

被引:35
|
作者
Kellner, Alexander W. A. [1 ]
机构
[1] Univ Fed Rio de Janeiro, Museu Nacl, Dept Geol & Paleontol, Lab Systemat & Taphon Fossil Vertebrates, BR-20940040 Rio de Janeiro, RJ, Brazil
关键词
Caupedactylus; palaeontology; systematics; Tapejaridae; HUAXIAPTERUS PTEROSAURIA; AZHDARCHOID PTEROSAUR; SANTANA FORMATION; CHINA; PHYLOGENY; REPTILES;
D O I
10.1017/S1755691013000327
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
A new unusual tapejarid pterosaur from the Early Cretaceous Romualdo Formation (Araripe Basin, Brazil) is described, based on a skull, lower jaw and some postcranial elements. Caupedactylus ybaka gen. et sp. shows the typical high nasoantorbital fenestra of the Thalassodrominae but lacks a palatal ridge, and shares with the Tapejarinae several features, including a downturned rostral end, allowing its allocation to that clade. Furthermore, the new species differs in having an anteriorly and posteriorly expanded premaxillary sagittal crest, the lacrimal process of the jugal strongly inclined, and a slit-like postpalatine fenestra, among other characters. The region of the left jugal-quadratojugalquadrate shows a pathology that is likely the result of an infection. The lateral surface of the premaxillary crest presents grooves that were interpreted in other pterosaurs as impressions of blood vessels, corroborating growing evidence that cranial crests could have been involved in thermoregulation. Also, the new species has a well-preserved palate with a large palatine forming the anterior region of the choanae and the postpalatine fenestra and a secondary subtemporal fenestra. Since the latter has been regarded as unique to non-pterodactyloids, its occurrence in Caupedactylus demonstrates that the evolution of palatal region in pterosaurs is more complex than previously thought.
引用
收藏
页码:409 / 421
页数:13
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