Isometopus ishigaki Yasunaga, 2005a: 343. Unavailable name (type depository not given).
Isometopus mahal (non Distant, 1911): Yasunaga, 2001d: 120; Yasunaga & Hayashi, 2002: 100. Misidentification (Yasunaga, 2005a: 343).
Isometopus ishigaki Yasunaga in Yasunaga et al., 2012: 112. HT: male, Japan, Ryukyus, Ishigaki Is., Mt Fukami-Omoto; AMNH.