Records of three decapod crustaceans from cave and anchialine habitats on Hatoma-jima Island, Yaeyama Island Group, southern Ryukyus, Japan

Three species of decapod crustaceans, Metabetaeus minutus (Whitelegge, 1897) (Alpheidae), Tuerkayana rotunda (Quoy & Gaimard, 1824) (Gecarcinidae), and Karstarma boholano (Ng, 2002) (Sesarmidae), are recorded for the first time on the basis of specimens collected from Hatoma-jima Island, Yaeyama Island Group, southern Ryukyus, Japan. Habitats of these decapods are briefly noted