heptacanthus, Gobius Hilgendorf [F. M.] 1879:110 [Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin 1879; ref. 21467] Tokyo, Japan. Syntypes: ZMB 10656 (1). •Valid as Chaenogobius heptacanthus (Hilgendorf 1879) -- (Akihito in Masuda et al. 1984:276 [ref. 6441], Sokolovskaya et al. 1998:13 [ref. 24670], Shimizu 2001:39 [ref. 25799], Choi et al. 2003:398, 658 [ref. 26218]). •Valid as Gymnogobius heptacanthus (Hilgendorf 1879) -- (Lindberg & Krasyukova 1975:382 [ref. 7348], Nakabo 2000:1198 [ref. 25182], Nakabo 2002:1198 [ref. 26193], Stevenson 2002:290 [ref. 26489], Vasil'eva 2003:S46 [ref. 28444], Zhao et al. 2007:454 [ref. 29515], Matsunuma et al. 2010:80 [ref. 31558], Matsui et al. 2014:10 [ref. 33344], Parin et al. 2014:486 [ref. 33547], Kim et al. 2020:169 [ref. 39118], Sonoyama et al. 2020:104 [ref. 37637], Ito et al. 2021:[9] [ref. 38897], Parenti 2021:297 [ref. 38603]). Current status: Valid as Gymnogobius heptacanthus (Hilgendorf 1879). Oxudercidae: Gobionellinae. Distribution: Northwestern Pacific: China to Korea, Russia and Japan. Habitat: marine.