Key to species of Parabothus of Taiwan

1A. D 83–89; A 63–67............................................................................. P. polylepis

1B. D 98–117; A 77–95.................................................................................... 2

2A. LLs 61–67; upper jaw teeth biserial; sometimes obtuse rostral spine in male............................. P. taiwanensis

2B. LLs> 78; upper jaw teeth uniserial; no rostral spine in male................................................... 3

3A. LLs 78–83; upper eye diameter 3.0– 3.5 in HL; no dark blotch at junction between curved and straight portion of lateral line; no dark spots along dorsal margin of upper eye.......................................................... P. kiensis

3B. LLs 87–95; upper eye diameter 3.5–3.9 in HL; two dark blotches at junction between curved and straight portion of lateral line; small dark spots along dorsal margin of upper eye.................................................. P. coarctatus