Hadronotus japonicus Ashmead comb. rev.

Hadronotus japonicus Ashmead, 1904c: 74 (original description); Kieffer, 1926: 453, 460 (description, keyed).

Gryon japonicus (Ashmead): Masner & Muesebeck, 1968: 35 (type information, generic transfer); Mineo, 1979a: 252 (description).

Gryon japonicum (Ashmead): Mineo, 1981a: 119, 130 (description of male, emendation, keyed); Johnson, 1992: 385 (cataloged, type information); Lê, 2000: 99, 119 (description, keyed); Kononova & Kozlov, 2008: 331, 421 (description, keyed).

Gryon mischa Kozlov & Kononova, 1989: 80, 94 (original description, keyed); Kozlov & Kononova, 1990: 268, 294 (description, keyed); Johnson, 1992: 388 (cataloged, type information); Kononova, 1995: 85 (keyed); Kononova & Petrov, 2002: 56 (keyed); Kononova & Kozlov, 2008: 330, 413 (description, keyed); Komeda, Mita, Hirose & Yamagishi, 2020: 106 (junior synonym of Gryon japonicum (Ashmead)).