 Megayoldia toyamaensis (Kuroda, 1929) |  Portlandia cf. lischkei (Smith, 1885) |  Portlandia japonica (Adams & Reeve, 1850) |
 Portlandia lischkei (Smith, 1885) |  Yoldia amygdalea (Valencienner, 1846) |  Yoldia glauca Kuroda & Habe in Habe, 1961 |
 Yoldia kikuchii Kuroda, 1929 |  Yoldia naganumana (Yokoyama, 1920) |  Yoldia notabilis Yokoyama, 1922 |
 Yoldia similis Kuroda & Habe, 1961 | | |