Key to species of Grammatobothus of Taiwan

1A. D 75–84; A 65–67; body deeply ovate, its depth 61.8–66% SL (1.5–1.6 in SL); 2nd to 10th rays of dorsal fin elongate........................................................................................... G. polyophthalmus

1B. D 82; A 66; body ovate, its depth 52.1% SL (1.9 in SL); 2nd to 4th rays of dorsal fin elongate.................. G. krempfi