In 1978, an incomplete sauropod humerus (NSM PV17656) found in a layer of the Early Cretaceous-aged Miyako Group of Japan was considered to probably belong to "Mamenchisaurus". In 1991, it was referred to ?"Mamenchisaurus" sp. by Hasegawa and colleagues"." However, the humerus was reassessed by Azuma & Tomida in 1998, and Barrett and colleagues in 2002. They couldn't find any distinguishing features that could place the humerus into a specific sauropod group. They regarded it as an indeterminate sauropod. The remains were given an informal name "Moshi-ryu"; "Moshi" being the local name for the location it was discovered, and "ryu" being Japanise for dragon — also referred to as "Moshisaurus".