The type species, S. dongi, is based on IVPP V13363, an articulated, nearly complete skeleton. The skull of this individual was 17 centimeters (6.7 inches) long, and the wingspan was estimated to be 1.2 meters (3.9 feet).
The species S. dongi is defined by IVPP V13363, a nearly complete skeletal specimen. The skull of this individual measured 17 centimeters in length, while its wingspan was estimated at 1.2 meters.