Also called “Satsuma-Utsunomiyaryu,” the fossilized plesiosaur was found in a 100-million-year-old stratum from the Cretaceous Period by Utsunomiya, a Panasonic Corp. employee, in 2004.

Among them was the fearsome plesiosaur, a marine reptile with a long neck and four large flippers that ruled the ancient seas ...