Key to species of Psettina in Taiwan

1A. Caudal fin without black blotch or band; dark blotches along dorsal and ventral margins of body not extending to bases of dorsal and anal fins; pectoral fin without dark botch or band; no large blotch on lateral line; teeth biserial on upper jaw and uniserial on lower jaw......................................................................................... 2

1B. Caudal fin with black blotch or band; a series of dark blotches along dorsal and ventral margins of body extending to dorsal and anal fin bases, respectively; pectoral fin with dark band or blotch; three obscure large dark blotches on lateral line; teeth on both jaws uniserial........................................................................................ 3

2A. Snout tip and both jaws blackish; upper-jaw length 7.4–8.9% SL; LLs 56–63.............................. P. gigantea

2B. Snout tip and both jaws pale brown; upper-jaw length 6.6–7.4% SL; LLs 46–51.............................. P. tosana

3A. LLs 55–61; D 89–91; A 66–71; GR 2–4+5–6......................................................... P. iijimae

3B. LLs 75–77; D 101–107; A 78–82; GR 0+7–8...................................................... P. variegata