Shenzhoupterus is a genus of toothless pterosaur belonging to the family Chaoyangopteridae. It lived during the Early Cretaceous period (Aptian stage) in what is now Liaoning Province, China. The genus was first described in 2008 by Lü Junchang and colleagues based on fossils recovered from the Jiufotang Formation.
Etymology
The name Shenzhoupterus is derived from "Shenzhou," an ancient name for China, and the Greek word "pteron," meaning wing. The specific epithet of the type species, S. chaoyangensis, refers to Chaoyang City, located near the fossil's discovery site.
Taxonomy and Classification
Shenzhoupterus is classified within the Azhdarchoidea, a major group of pterodactyloid pterosaurs. It is the type genus of the family Chaoyangopteridae. While closely related to the Azhdarchidae (a group known for giant forms like Quetzalcoatlus), chaoyangopterids are generally distinguished by their smaller size and specific skull proportions.
Currently, two species are recognized within the genus:
- Shenzhoupterus chaoyangensis (2008): The type species, based on a specimen (HGM 41HIII-3013) consisting of a nearly complete skeleton and skull.
- Shenzhoupterus sanyuanensis (2023): Described based on a well-preserved skeleton, this species provided further data on the morphological diversity of the genus.
Description
Shenzhoupterus is characterized by a toothless beak and a large, distinctive cranial crest. The skull features a notably large nasoantorbital fenestra—a combined opening for the nostril and the antorbital cavity—which occupies a significant portion of the skull length. The crest typically rises from the back of the snout and curves over the braincase.
Like other members of the Jehol Biota, Shenzhoupterus was a terrestrial-adapted flyer. It possessed a wingspan estimated to be approximately 2 meters (6.5 feet). Its skeletal structure suggests it was capable of efficient movement on the ground as well as flight.
Paleoecology
The fossils of Shenzhoupterus originate from the Jiufotang Formation, an environment characterized by a series of lakes, forests, and volcanic activity. It coexisted with a diverse array of feathered dinosaurs, early birds, and other pterosaur lineages. Based on its lack of teeth and skull morphology, researchers suggest it may have been an omnivore or a specialized feeder, though its exact diet remains a subject of ongoing paleontological study.