"Satsuma-utsunomiya-ryu" is an undescribed plesiosaur known from Kyushu, Japan.[1] This nickname is named after the former province name of the discovery site and the discoverer, Satoshi Utsunomiya.[2] It is the oldest known elasmosaurid plesiosaur fossil in East Asia, dating back to approximately 100 million years ago. It is permanently exhibited at the Kagoshima Prefectural Museum.[3]
Furthermore, the world's first plesiosaur "pellet" was found in the throat area.[4][5]