Fig. 1.
Geographic location of the Ryukyu Archipelago. The Japanese Archipelago includes Hokkaido, Honshu, Shikoku, and Kyushu islands. The Ryukyu Archipelago includes Amami, Okinawa, Miyako, and Yaeyama Islands. The Miyako Islands comprise eight islands: Ikema, Irabu, Kurima, Minna, Miyakojima, Ogami, Shimoji, and Tarama.