Liên quan Ryukyu Ryukyucardiophorus Ryukyua globosa Ryukyucardiophorus loochooensis Ryukyucardiophorus alvini Ryukyua circularis Ryukyucardiophorus babai Ryukyucardiophorus mertliki Ryukyucardiophorus tokarensis Ryu Hyuk-in