Key to the species of Labeo in Sri Lanka

1 Lateral line scales on body ± 40.......................................................................... 2

- Lateral line scales on body> 40.............................................................. Labeo heladiva

2 Scales between origin of dorsal fin and lateral line Ż 7........................................................ 3

- Scales between origin of dorsal fin and lateral line <7.................................................. L. rohita

3 ½8 scales between origin of dorsal fin and lateral line; 21–24 circumpeduncular scales; dorsal fin 23.3–28.2% SL....................................................................................................... L. lankae

- 7–8 scales between origin of dorsal fin and lateral line; 17–20 circumpeduncular scales; dorsal fin 18.5–23.4% SL....................................................................................................... L. fisheri