Echinoecus pentagonus (A. Milne-Edwards, 1879)

[Jn: Murasakigokakugani]

— Rathbun (1894: Futami Bay, Chichi-jima I.); Miyake (1939, as E. rathbunae nom. nov.: Futami Bay, Chichi-jima I., ca. 180m); OIBO (2014, in table 2: Futami Bay off Shiraboshi, Chichi-jima I.); OIBO (2015, in table 2: Oki Harbor, Haha-jima I.); OIBO (2017a, in table 1; 2017b, in table 1: Omura Beach, Chichi-jima I.)