Fusigobius (Whitely)

Diagnostic key to all nominal species of Fusigobius (Whitely) View in CoL from Taiwanese waters (including Dongsha and Taiping Island)

1. D2 I/10; A I/9, pelvic fin well separated without frenum............................................... F. melacron

- D2 I/9; A I/8, pelvic fin united with frenum................................................................. 2

2. Anterior 2 spines as elongate extension....................................................... F. inframaculatus

- Anterior 2 spines not elongate........................................................................... 3

3. A conspicuous grayish-black mark on upper origin of pectoral fin...................................... F. humeralis

- No such black mark................................................................................... 4

4. Lateral extension of canal with 3 pores........................................................... F. neophytus

- Lateral extension of canal with 2 pores.................................................................... 5

5. First dorsal fin with a vertical black mark in front of 3 rd spine; lateral side with 4 major grayish brown blotches...................................................................................................... F. duospilus

- First dorsal fin with a round black spot on upper 1/3 region; lateral side with a series of small, bright yellow rounded marks...................................................................................... F. taipinensis n. sp.